diff --git a/typescript/faucet-mcp/README.md b/typescript/faucet-mcp/README.md new file mode 100644 index 0000000..d3b4287 --- /dev/null +++ b/typescript/faucet-mcp/README.md @@ -0,0 +1,211 @@ +# TBNB Faucet MCP Server (Node.js) + +A Node.js implementation of a Model Context Protocol (MCP) server that provides a faucet service for distributing testnet BNB tokens on the Binance Smart Chain testnet. + +## About + +This MCP server enables AI agents and other MCP clients to request and receive testnet BNB tokens by interacting with the BSC testnet blockchain. It follows the Anthropic MCP specification and can be integrated with any MCP-compatible client. + +## Prerequisites + +- Node.js 18.0 or higher +- npm or yarn package manager +- A BSC testnet wallet with TBNB for the faucet +- Access to BSC testnet RPC endpoint + +## Installation + +1. Navigate to the project directory: +```bash +cd faucet-mcp +``` + +2. Install dependencies: +```bash +npm install +``` + +## Configuration + +Set the following environment variables before running: + +- `FAUCET_PRIVATE_KEY`: The private key of your faucet wallet (required) +- `BSC_TESTNET_RPC`: BSC testnet RPC endpoint URL (optional, has default) + +Example: + +```bash +export FAUCET_PRIVATE_KEY="0x..." +export BSC_TESTNET_RPC="https://data-seed-prebsc-1-s1.binance.org:8545/" +``` + +Or create a `.env` file (not included in repo for security): + +``` +FAUCET_PRIVATE_KEY=0x... +BSC_TESTNET_RPC=https://data-seed-prebsc-1-s1.binance.org:8545/ +``` + +## Usage + +Run the server: + +```bash +node index.js +``` + +Or using npm: + +```bash +npm start +``` + +The server communicates via stdio, which is the standard transport for MCP servers. + +## Available Tools + +### send_tbnb + +Sends testnet BNB tokens to a recipient address. + +**Parameters:** +- `recipient` (string, required): BSC testnet address to receive tokens +- `amount` (number, optional): Amount of TBNB to send (default: 0.1, max: 1.0) + +**Returns:** +- Transaction hash +- Recipient address +- Amount sent +- Block number +- Transaction status + +### get_faucet_info + +Retrieves information about the faucet wallet. + +**Parameters:** None + +**Returns:** +- Faucet wallet address +- Current balance (Wei and TBNB) +- Network information +- RPC endpoint + +### get_balance + +Queries the TBNB balance of any BSC testnet address. + +**Parameters:** +- `address` (string, required): BSC testnet address to check + +**Returns:** +- Address (checksummed) +- Balance in Wei and TBNB +- Network name + +## MCP Client Integration + +To integrate this server with an MCP client, add it to your client configuration: + +```json +{ + "mcpServers": { + "tbnb-faucet": { + "command": "node", + "args": ["/absolute/path/to/index.js"], + "env": { + "FAUCET_PRIVATE_KEY": "0x...", + "BSC_TESTNET_RPC": "https://data-seed-prebsc-1-s1.binance.org:8545/" + } + } + } +} +``` + +## Network Configuration + +- **Network**: Binance Smart Chain Testnet +- **Chain ID**: 97 +- **Default RPC**: https://data-seed-prebsc-1-s1.binance.org:8545/ +- **Block Explorer**: https://testnet.bscscan.com + +## Error Handling + +The server includes comprehensive error handling: + +- Address validation (checksum and format) +- Amount validation (0 to 1.0 TBNB) +- Self-transfer prevention +- Network connectivity checks +- Transaction error reporting + +All errors are returned as structured JSON responses. + +## Security + +๐Ÿ”’ **Security Best Practices:** + +- Never commit your private key to version control +- Use environment variables or secure secret management systems +- This server is intended for testnet use only +- Consider implementing rate limiting for production deployments +- Monitor faucet balance and set up alerts + +## Troubleshooting + +### Common Issues + +**"Faucet wallet not configured"** +- Ensure `FAUCET_PRIVATE_KEY` environment variable is set +- Verify the private key is valid and starts with `0x` + +**Connection errors** +- Check your internet connection +- Verify the RPC endpoint is accessible +- Try an alternative BSC testnet RPC endpoint + +**Transaction failures** +- Ensure the faucet wallet has sufficient TBNB balance +- Verify the recipient address is valid +- Check network conditions (gas prices, congestion) + +**Module not found errors** +- Run `npm install` to install dependencies +- Ensure you're using Node.js 18.0 or higher + +## Development + +The server uses: +- `@modelcontextprotocol/sdk` for MCP protocol implementation +- `ethers.js` v6 for blockchain interactions + +## License + +MIT License + +## Testing + +Run unit tests: + +```bash +npm install +npm test +``` + +Run tests with coverage: + +```bash +npm run test:coverage +``` + +Run tests in watch mode: + +```bash +npm run test:watch +``` + +## Resources + +- [Model Context Protocol Documentation](https://modelcontextprotocol.io) +- [BNB Chain Documentation](https://docs.bnbchain.org) +- [Ethers.js Documentation](https://docs.ethers.org) diff --git a/typescript/faucet-mcp/index.js b/typescript/faucet-mcp/index.js new file mode 100644 index 0000000..6414234 --- /dev/null +++ b/typescript/faucet-mcp/index.js @@ -0,0 +1,299 @@ +#!/usr/bin/env node + +/** + * TBNB Faucet MCP Server + * Model Context Protocol server for distributing testnet BNB tokens + */ + +import { Server } from "@modelcontextprotocol/sdk/server/index.js"; +import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; +import { + CallToolRequestSchema, + ListToolsRequestSchema, +} from "@modelcontextprotocol/sdk/types.js"; +import { ethers } from "ethers"; + +// Configuration +const BSC_TESTNET_RPC = process.env.BSC_TESTNET_RPC || "https://data-seed-prebsc-1-s1.binance.org:8545/"; +const FAUCET_PRIVATE_KEY = process.env.FAUCET_PRIVATE_KEY || ""; + +if (!FAUCET_PRIVATE_KEY) { + console.error("WARNING: FAUCET_PRIVATE_KEY environment variable is not set"); +} + +// Initialize provider and wallet +const provider = new ethers.JsonRpcProvider(BSC_TESTNET_RPC); +let wallet = null; +let walletAddress = null; + +if (FAUCET_PRIVATE_KEY) { + wallet = new ethers.Wallet(FAUCET_PRIVATE_KEY, provider); + walletAddress = wallet.address; +} + +// MCP Server +const server = new Server( + { + name: "tbnb-faucet", + version: "1.0.0", + }, + { + capabilities: { + tools: {}, + }, + } +); + +// List available tools +server.setRequestHandler(ListToolsRequestSchema, async () => { + return { + tools: [ + { + name: "send_tbnb", + description: "Send testnet BNB tokens to a specified address on BSC testnet", + inputSchema: { + type: "object", + properties: { + recipient: { + type: "string", + description: "The BSC testnet address that will receive the TBNB tokens", + }, + amount: { + type: "number", + description: "Amount of TBNB to send (default: 0.1, maximum: 1.0)", + default: 0.1, + }, + }, + required: ["recipient"], + }, + }, + { + name: "get_faucet_info", + description: "Get information about the faucet including current balance", + inputSchema: { + type: "object", + properties: {}, + }, + }, + { + name: "get_balance", + description: "Get the TBNB balance of a BSC testnet address", + inputSchema: { + type: "object", + properties: { + address: { + type: "string", + description: "The BSC testnet address to check", + }, + }, + required: ["address"], + }, + }, + ], + }; +}); + +// Handle tool calls +server.setRequestHandler(CallToolRequestSchema, async (request) => { + const { name, arguments: args } = request.params; + + try { + switch (name) { + case "send_tbnb": + return await handleSendTbnb(args); + case "get_faucet_info": + return await handleGetFaucetInfo(); + case "get_balance": + return await handleGetBalance(args); + default: + throw new Error(`Unknown tool: ${name}`); + } + } catch (error) { + return { + content: [ + { + type: "text", + text: JSON.stringify( + { + error: error.message, + }, + null, + 2 + ), + }, + ], + isError: true, + }; + } +}); + +/** + * Send TBNB to a recipient address + */ +async function handleSendTbnb(args) { + if (!wallet) { + throw new Error("Faucet wallet not configured. Please set FAUCET_PRIVATE_KEY."); + } + + const recipient = args?.recipient; + const amount = args?.amount || 0.1; + + if (!recipient) { + throw new Error("Recipient address is required"); + } + + // Validate address + if (!ethers.isAddress(recipient)) { + throw new Error(`Invalid address: ${recipient}`); + } + + const recipientAddress = ethers.getAddress(recipient); + + // Prevent self-transfer + if (recipientAddress.toLowerCase() === walletAddress.toLowerCase()) { + throw new Error("Cannot send tokens to the faucet address itself"); + } + + // Validate amount + if (amount <= 0 || amount > 1.0) { + throw new Error("Amount must be between 0 and 1.0 TBNB"); + } + + try { + // Convert amount to Wei + const amountWei = ethers.parseEther(amount.toString()); + + // Get current gas price + const feeData = await provider.getFeeData(); + + // Send transaction + const tx = await wallet.sendTransaction({ + to: recipientAddress, + value: amountWei, + gasLimit: 21000, + gasPrice: feeData.gasPrice, + }); + + // Wait for transaction to be mined + const receipt = await tx.wait(); + + return { + content: [ + { + type: "text", + text: JSON.stringify( + { + success: true, + transactionHash: tx.hash, + recipient: recipientAddress, + amount: amount, + amountWei: amountWei.toString(), + blockNumber: receipt.blockNumber, + status: receipt.status === 1 ? "confirmed" : "failed", + }, + null, + 2 + ), + }, + ], + }; + } catch (error) { + throw new Error(`Transaction failed: ${error.message}`); + } +} + +/** + * Get faucet information and balance + */ +async function handleGetFaucetInfo() { + if (!walletAddress) { + throw new Error("Faucet wallet not configured"); + } + + try { + const balance = await provider.getBalance(walletAddress); + const balanceTbnb = ethers.formatEther(balance); + + // Get network info + const network = await provider.getNetwork(); + + return { + content: [ + { + type: "text", + text: JSON.stringify( + { + faucetAddress: walletAddress, + balanceWei: balance.toString(), + balanceTbnb: parseFloat(balanceTbnb), + network: { + name: "BSC Testnet", + chainId: network.chainId.toString(), + }, + rpcEndpoint: BSC_TESTNET_RPC, + }, + null, + 2 + ), + }, + ], + }; + } catch (error) { + throw new Error(`Failed to get faucet info: ${error.message}`); + } +} + +/** + * Get balance of an address + */ +async function handleGetBalance(args) { + const address = args?.address; + + if (!address) { + throw new Error("Address is required"); + } + + // Validate address + if (!ethers.isAddress(address)) { + throw new Error(`Invalid address: ${address}`); + } + + try { + const addressChecksum = ethers.getAddress(address); + const balance = await provider.getBalance(addressChecksum); + const balanceTbnb = ethers.formatEther(balance); + + return { + content: [ + { + type: "text", + text: JSON.stringify( + { + address: addressChecksum, + balanceWei: balance.toString(), + balanceTbnb: parseFloat(balanceTbnb), + network: "BSC Testnet", + }, + null, + 2 + ), + }, + ], + }; + } catch (error) { + throw new Error(`Failed to get balance: ${error.message}`); + } +} + +// Start server +async function main() { + const transport = new StdioServerTransport(); + await server.connect(transport); + + console.error("TBNB Faucet MCP Server running on stdio"); +} + +main().catch((error) => { + console.error("Fatal error:", error); + process.exit(1); +}); diff --git a/typescript/faucet-mcp/index.test.js b/typescript/faucet-mcp/index.test.js new file mode 100644 index 0000000..9f47c94 --- /dev/null +++ b/typescript/faucet-mcp/index.test.js @@ -0,0 +1,277 @@ +/** + * Unit tests for TBNB Faucet MCP Server (Example 3 - Node.js) + * + * Note: These tests focus on the business logic and validation + * rather than full integration with the MCP server, since the server + * initializes on import and uses stdio transport. + */ + +import { describe, test, expect, beforeEach, jest } from '@jest/globals'; + +describe('Address Validation Logic', () => { + test('should validate correct Ethereum address format', () => { + const validAddress = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb0'; + // Ethereum addresses are 42 characters (0x + 40 hex chars) + expect(validAddress.length).toBe(42); + expect(validAddress.startsWith('0x')).toBe(true); + expect(/^0x[a-fA-F0-9]{40}$/.test(validAddress)).toBe(true); + }); + + test('should reject invalid address formats', () => { + const invalidAddresses = [ + 'invalid', + '0x123', + '742d35Cc6634C0532925a3b844Bc9e7595f0bEb', // Missing 0x + '0xGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG', // Invalid hex + '', + ]; + + invalidAddresses.forEach((addr) => { + const isValid = addr.length === 42 && addr.startsWith('0x') && /^0x[a-fA-F0-9]{40}$/.test(addr); + expect(isValid).toBe(false); + }); + }); +}); + +describe('Amount Validation Logic', () => { + test('should accept valid amounts between 0 and 1.0', () => { + const validAmounts = [0.01, 0.1, 0.5, 1.0]; + + validAmounts.forEach((amount) => { + const isValid = amount > 0 && amount <= 1.0; + expect(isValid).toBe(true); + }); + }); + + test('should reject zero or negative amounts', () => { + const invalidAmounts = [0, -0.1, -1.0]; + + invalidAmounts.forEach((amount) => { + const isValid = amount > 0 && amount <= 1.0; + expect(isValid).toBe(false); + }); + }); + + test('should reject amounts greater than 1.0', () => { + const invalidAmounts = [1.1, 2.0, 10.0]; + + invalidAmounts.forEach((amount) => { + const isValid = amount > 0 && amount <= 1.0; + expect(isValid).toBe(false); + }); + }); +}); + +describe('Self-Transfer Prevention Logic', () => { + test('should detect self-transfer attempts', () => { + const faucetAddress = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb'; + const recipient = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb'; + + const isSelfTransfer = recipient.toLowerCase() === faucetAddress.toLowerCase(); + expect(isSelfTransfer).toBe(true); + }); + + test('should allow transfers to different addresses', () => { + const faucetAddress = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb'; + const recipient = '0x1234567890123456789012345678901234567890'; + + const isSelfTransfer = recipient.toLowerCase() === faucetAddress.toLowerCase(); + expect(isSelfTransfer).toBe(false); + }); +}); + +describe('Wei Conversion Logic', () => { + test('should convert TBNB to Wei correctly', () => { + // 1 TBNB = 10^18 Wei + const tbnbAmounts = [ + { tbnb: 0.1, wei: '100000000000000000' }, + { tbnb: 1.0, wei: '1000000000000000000' }, + { tbnb: 0.01, wei: '10000000000000000' }, + ]; + + tbnbAmounts.forEach(({ tbnb, wei }) => { + // Manual conversion for testing + const calculatedWei = (tbnb * Math.pow(10, 18)).toString(); + expect(calculatedWei).toBe(wei); + }); + }); + + test('should handle Wei to TBNB conversion', () => { + const weiAmounts = [ + { wei: '100000000000000000', tbnb: 0.1 }, + { wei: '1000000000000000000', tbnb: 1.0 }, + { wei: '500000000000000000', tbnb: 0.5 }, + ]; + + weiAmounts.forEach(({ wei, tbnb }) => { + // Manual conversion for testing + const calculatedTbnb = parseFloat(wei) / Math.pow(10, 18); + expect(calculatedTbnb).toBeCloseTo(tbnb, 10); + }); + }); +}); + +describe('Transaction Response Format', () => { + test('should format successful transaction response correctly', () => { + const mockResponse = { + success: true, + transactionHash: '0xabcdef1234567890', + recipient: '0x1234567890123456789012345678901234567890', + amount: 0.1, + amountWei: '100000000000000000', + blockNumber: 12345, + status: 'confirmed', + }; + + expect(mockResponse).toHaveProperty('success'); + expect(mockResponse).toHaveProperty('transactionHash'); + expect(mockResponse).toHaveProperty('recipient'); + expect(mockResponse).toHaveProperty('amount'); + expect(mockResponse).toHaveProperty('blockNumber'); + expect(mockResponse).toHaveProperty('status'); + expect(mockResponse.success).toBe(true); + expect(mockResponse.status).toBe('confirmed'); + }); + + test('should format error response correctly', () => { + const mockErrorResponse = { + error: 'Invalid address: invalid_address', + }; + + expect(mockErrorResponse).toHaveProperty('error'); + expect(typeof mockErrorResponse.error).toBe('string'); + }); +}); + +describe('Faucet Info Response Format', () => { + test('should format faucet info response correctly', () => { + const mockFaucetInfo = { + faucetAddress: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb', + balanceWei: '1000000000000000000', + balanceTbnb: 1.0, + network: { + name: 'BSC Testnet', + chainId: '97', + }, + rpcEndpoint: 'https://data-seed-prebsc-1-s1.binance.org:8545/', + }; + + expect(mockFaucetInfo).toHaveProperty('faucetAddress'); + expect(mockFaucetInfo).toHaveProperty('balanceWei'); + expect(mockFaucetInfo).toHaveProperty('balanceTbnb'); + expect(mockFaucetInfo).toHaveProperty('network'); + expect(mockFaucetInfo).toHaveProperty('rpcEndpoint'); + expect(mockFaucetInfo.network.chainId).toBe('97'); + }); +}); + +describe('Balance Query Response Format', () => { + test('should format balance query response correctly', () => { + const mockBalanceResponse = { + address: '0x1234567890123456789012345678901234567890', + balanceWei: '500000000000000000', + balanceTbnb: 0.5, + network: 'BSC Testnet', + }; + + expect(mockBalanceResponse).toHaveProperty('address'); + expect(mockBalanceResponse).toHaveProperty('balanceWei'); + expect(mockBalanceResponse).toHaveProperty('balanceTbnb'); + expect(mockBalanceResponse).toHaveProperty('network'); + expect(mockBalanceResponse.balanceTbnb).toBe(0.5); + }); +}); + +describe('Error Handling', () => { + test('should handle missing recipient address', () => { + const recipient = ''; + if (!recipient) { + expect(() => { + throw new Error('Recipient address is required'); + }).toThrow('Recipient address is required'); + } + }); + + test('should handle missing wallet configuration', () => { + const wallet = null; + if (!wallet) { + expect(() => { + throw new Error('Faucet wallet not configured. Please set FAUCET_PRIVATE_KEY.'); + }).toThrow('Faucet wallet not configured'); + } + }); + + test('should handle network errors gracefully', () => { + const networkError = new Error('Network error'); + expect(networkError.message).toBe('Network error'); + expect(networkError).toBeInstanceOf(Error); + }); +}); + +describe('MCP Tool Schema Validation', () => { + test('send_tbnb tool should have correct schema structure', () => { + const toolSchema = { + name: 'send_tbnb', + description: 'Send testnet BNB tokens to a specified address on BSC testnet', + inputSchema: { + type: 'object', + properties: { + recipient: { + type: 'string', + description: 'The BSC testnet address that will receive the TBNB tokens', + }, + amount: { + type: 'number', + description: 'Amount of TBNB to send (default: 0.1, maximum: 1.0)', + default: 0.1, + }, + }, + required: ['recipient'], + }, + }; + + expect(toolSchema).toHaveProperty('name'); + expect(toolSchema).toHaveProperty('description'); + expect(toolSchema).toHaveProperty('inputSchema'); + expect(toolSchema.inputSchema.type).toBe('object'); + expect(toolSchema.inputSchema.required).toContain('recipient'); + }); + + test('get_faucet_info tool should have correct schema structure', () => { + const toolSchema = { + name: 'get_faucet_info', + description: 'Get information about the faucet including current balance', + inputSchema: { + type: 'object', + properties: {}, + }, + }; + + expect(toolSchema).toHaveProperty('name'); + expect(toolSchema).toHaveProperty('description'); + expect(toolSchema).toHaveProperty('inputSchema'); + expect(toolSchema.inputSchema.type).toBe('object'); + }); + + test('get_balance tool should have correct schema structure', () => { + const toolSchema = { + name: 'get_balance', + description: 'Get the TBNB balance of a BSC testnet address', + inputSchema: { + type: 'object', + properties: { + address: { + type: 'string', + description: 'The BSC testnet address to check', + }, + }, + required: ['address'], + }, + }; + + expect(toolSchema).toHaveProperty('name'); + expect(toolSchema).toHaveProperty('description'); + expect(toolSchema).toHaveProperty('inputSchema'); + expect(toolSchema.inputSchema.required).toContain('address'); + }); +}); diff --git a/typescript/faucet-mcp/package.json b/typescript/faucet-mcp/package.json new file mode 100644 index 0000000..8e7ca75 --- /dev/null +++ b/typescript/faucet-mcp/package.json @@ -0,0 +1,41 @@ +{ + "name": "tbnb-faucet-mcp", + "version": "1.0.0", + "description": "MCP server for distributing testnet BNB tokens on BSC testnet", + "type": "module", + "main": "index.js", + "scripts": { + "start": "node index.js", + "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js", + "test:watch": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch", + "test:coverage": "node --experimental-vm-modules node_modules/jest/bin/jest.js --coverage" + }, + "keywords": [ + "mcp", + "model-context-protocol", + "bnb", + "testnet", + "faucet", + "blockchain" + ], + "author": "", + "license": "MIT", + "dependencies": { + "@modelcontextprotocol/sdk": "^0.5.0", + "ethers": "^6.9.0" + }, + "devDependencies": { + "@jest/globals": "^29.7.0", + "jest": "^29.7.0" + }, + "engines": { + "node": ">=18.0.0" + }, + "jest": { + "testEnvironment": "node", + "transform": {}, + "moduleNameMapper": { + "^(\\.{1,2}/.*)\\.js$": "$1" + } + } +} diff --git a/typescript/mev-risk-meter/README.md b/typescript/mev-risk-meter/README.md new file mode 100644 index 0000000..ec5b2b3 --- /dev/null +++ b/typescript/mev-risk-meter/README.md @@ -0,0 +1,139 @@ +# MEV Risk Meter + +A small BNB Smart Chain (BSC) demo that analyzes transactions and contracts for MEV (Maximal Extractable Value) risks. Use it to identify potential vulnerabilities to front-running, sandwich attacks, and other MEV extraction strategies. + +![Screenshot](./mev-risk-meter.png) + +--- + +## What it does + +- **Analyzes transactions** โ€” Checks for swap operations, high gas prices, and large values that make transactions attractive MEV targets +- **Analyzes contracts** โ€” Identifies swap functions, flash loan capabilities, price oracle dependencies, and unprotected operations +- **Risk scoring** โ€” Provides a 0โ€“100 risk score with detailed findings for each detected MEV vector +- **Real-time analysis** โ€” Fetches live transaction and contract data from BSC RPC endpoints + +This tool helps developers and users understand MEV risks before interacting with contracts or submitting transactions on BSC. + +--- + +## What is MEV? + +MEV (Maximal Extractable Value) refers to value that can be extracted from block production in excess of the standard block reward and gas fees. Common MEV strategies include: + +- **Front-running** โ€” Submitting a transaction with higher gas price to execute before a target transaction +- **Sandwich attacks** โ€” Placing transactions before and after a target swap to profit from price impact +- **Arbitrage** โ€” Exploiting price differences across DEXs or markets +- **Liquidation** โ€” Liquidating undercollateralized positions for profit + +--- + +## Tech stack + +- **TypeScript** (Node 18+) +- **Express** โ€” HTTP server and `/api/analyze` endpoint +- **Single-page UI** โ€” `frontend.html` (vanilla JS, dark theme) +- **BSC JSON-RPC** โ€” Transaction and contract data fetching + +--- + +## Quick start + +### 1. Clone and run (recommended) + +From the project directory: + +```bash +chmod +x clone-and-run.sh +./clone-and-run.sh +``` + +The script installs deps, seeds `.env` from `.env.example`, runs tests, and starts the app. Open [http://localhost:3000](http://localhost:3000). + +### 2. Manual setup + +```bash +npm install +cp .env.example .env +# Edit .env if needed (default RPC URL is already set) +npm run build +npm test +npm start +``` + +Then open [http://localhost:3000](http://localhost:3000). + +--- + +## Environment variables + +| Variable | Default | Description | +|----------------|----------------------------------|----------------------------| +| `BSC_RPC_URL` | `https://bsc-dataseed.bnbchain.org` | BSC JSON-RPC endpoint | +| `PORT` | `3000` | HTTP server port | + +--- + +## Project layout + +| File | Purpose | +|-----------------|----------------------------------------------| +| `app.ts` | Express server, RPC client, MEV risk logic | +| `frontend.html` | Dark-mode UI (left: info, right: analyzer) | +| `app.test.ts` | Unit tests for all MEV analysis functions | +| `clone-and-run.sh` | One-command setup and run | +| `README.md` | This file | + +--- + +## API + +- `GET /` โ€” Serves the UI. +- `GET /api/analyze?input=0x...` โ€” Analyzes the given transaction hash or contract address. Returns JSON: + + ```json + { + "address": "0x...", + "riskScore": 75, + "riskLabel": "Medium risk", + "findings": [ + { "level": "high", "label": "Swap transaction detected", "description": "..." } + ], + "transactionHash": "0x...", + "contractType": "Transaction" + } + ``` + +--- + +## How it works + +### Transaction Analysis + +- **Swap detection** โ€” Identifies common DEX swap function signatures +- **Gas price analysis** โ€” Flags transactions with gas prices >20% above current average +- **Value analysis** โ€” Identifies transactions with significant value (>0.1 BNB) + +### Contract Analysis + +- **Function detection** โ€” Scans ABI for swap, flash loan, and oracle functions +- **Risk assessment** โ€” Evaluates unprotected operations and centralization risks +- **Pattern matching** โ€” Identifies common MEV-vulnerable patterns + +--- + +## Limitations + +This is a heuristic analysis tool and **not** a replacement for: + +- Professional security audits +- Comprehensive MEV risk assessments +- On-chain monitoring and simulation + +For production use, review contract source code on BSCTrace and use specialized MEV analysis tools. + +--- + +## License + +MIT. diff --git a/typescript/mev-risk-meter/app.test.ts b/typescript/mev-risk-meter/app.test.ts new file mode 100644 index 0000000..c454e49 --- /dev/null +++ b/typescript/mev-risk-meter/app.test.ts @@ -0,0 +1,330 @@ +import { describe, it, expect, vi, beforeEach, afterEach } from "vitest"; +import { + normalizeAddress, + isValidBscAddress, + isValidTxHash, + hasSwapFunctions, + hasPriceOracleDependencies, + hasFlashLoanFunctions, + isSwapTransaction, + hasHighGasPrice, + hasSignificantValue, + analyzeContractMevRisks, + analyzeTransactionMevRisks, + fetchTransaction, + fetchCurrentGasPrice, + fetchContractCode, + analyzeMevRisk, +} from "./app.js"; + +describe("normalizeAddress", () => { + it("returns lowercase 0x-prefixed string for valid address", () => { + expect(normalizeAddress("0xAbC0123456789012345678901234567890aBcDeF")).toBe( + "0xabc0123456789012345678901234567890abcdef" + ); + }); + it("returns empty string for invalid format", () => { + expect(normalizeAddress("0x123")).toBe(""); + expect(normalizeAddress("abc")).toBe(""); + expect(normalizeAddress("")).toBe(""); + }); +}); + +describe("isValidBscAddress", () => { + it("returns true for valid 0x40-hex", () => { + expect(isValidBscAddress("0x0000000000000000000000000000000000000001")).toBe(true); + }); + it("returns false for too short or non-hex", () => { + expect(isValidBscAddress("0x123")).toBe(false); + expect(isValidBscAddress("0xgg00000000000000000000000000000000000001")).toBe(false); + }); +}); + +describe("isValidTxHash", () => { + it("returns true for valid 0x64-hex", () => { + expect(isValidTxHash("0x" + "a".repeat(64))).toBe(true); + }); + it("returns false for too short or non-hex", () => { + expect(isValidTxHash("0x123")).toBe(false); + expect(isValidTxHash("0x" + "g".repeat(64))).toBe(false); + }); +}); + +describe("hasSwapFunctions", () => { + it("returns true when swap functions present", () => { + const abi = [ + { name: "swapExactTokensForTokens" }, + { name: "transfer" }, + ]; + expect(hasSwapFunctions(abi)).toBe(true); + }); + it("returns false when no swap functions", () => { + const abi = [{ name: "balanceOf" }, { name: "transfer" }]; + expect(hasSwapFunctions(abi)).toBe(false); + }); +}); + +describe("hasPriceOracleDependencies", () => { + it("returns true when oracle functions present", () => { + const abi = [{ name: "getPrice" }, { name: "latestRoundData" }]; + expect(hasPriceOracleDependencies(abi)).toBe(true); + }); + it("returns false when no oracle functions", () => { + const abi = [{ name: "balanceOf" }]; + expect(hasPriceOracleDependencies(abi)).toBe(false); + }); +}); + +describe("hasFlashLoanFunctions", () => { + it("returns true when flash loan functions present", () => { + const abi = [{ name: "flashLoan" }, { name: "borrow" }]; + expect(hasFlashLoanFunctions(abi)).toBe(true); + }); + it("returns false when no flash loan functions", () => { + const abi = [{ name: "transfer" }]; + expect(hasFlashLoanFunctions(abi)).toBe(false); + }); +}); + +describe("isSwapTransaction", () => { + it("returns true for swap transaction signatures", () => { + expect(isSwapTransaction("0x38ed1739" + "0".repeat(56))).toBe(true); + expect(isSwapTransaction("0x7ff36ab5" + "0".repeat(56))).toBe(true); + }); + it("returns false for non-swap transactions", () => { + expect(isSwapTransaction("0x12345678" + "0".repeat(56))).toBe(false); + }); +}); + +describe("hasHighGasPrice", () => { + it("returns true when gas price is >20% higher", () => { + const txGas = "0x" + (BigInt("20000000000") * BigInt(130) / BigInt(100)).toString(16); + const currentGas = "0x" + BigInt("20000000000").toString(16); + expect(hasHighGasPrice(txGas, currentGas)).toBe(true); + }); + it("returns false when gas price is within normal range", () => { + const txGas = "0x" + BigInt("20000000000").toString(16); + const currentGas = "0x" + BigInt("20000000000").toString(16); + expect(hasHighGasPrice(txGas, currentGas)).toBe(false); + }); +}); + +describe("hasSignificantValue", () => { + it("returns true for values >0.1 BNB", () => { + const value = "0x" + BigInt("200000000000000000").toString(16); // 0.2 BNB + expect(hasSignificantValue(value)).toBe(true); + }); + it("returns false for small values", () => { + const value = "0x" + BigInt("10000000000000000").toString(16); // 0.01 BNB + expect(hasSignificantValue(value)).toBe(false); + }); +}); + +describe("analyzeContractMevRisks", () => { + it("flags swap functions", () => { + const abi = [{ name: "swapExactTokensForTokens" }]; + const { score, findings } = analyzeContractMevRisks(abi); + expect(findings.some((f) => f.label === "Swap functions detected")).toBe(true); + expect(score).toBeLessThan(100); + }); + + it("flags flash loan functions", () => { + const abi = [{ name: "flashLoan" }]; + const { score, findings } = analyzeContractMevRisks(abi); + expect(findings.some((f) => f.label === "Flash loan functions")).toBe(true); + expect(score).toBeLessThan(100); + }); + + it("flags price oracle dependencies", () => { + const abi = [{ name: "getPrice" }]; + const { findings } = analyzeContractMevRisks(abi); + expect(findings.some((f) => f.label === "Price oracle dependencies")).toBe(true); + }); + + it("score is 0โ€“100", () => { + const { score } = analyzeContractMevRisks([]); + expect(score).toBeGreaterThanOrEqual(0); + expect(score).toBeLessThanOrEqual(100); + }); +}); + +describe("analyzeTransactionMevRisks", () => { + it("flags swap transactions", () => { + const tx = { input: "0x38ed1739" + "0".repeat(56) }; + const { score, findings } = analyzeTransactionMevRisks(tx, "0x" + BigInt("20000000000").toString(16)); + expect(findings.some((f) => f.label === "Swap transaction detected")).toBe(true); + expect(score).toBeLessThan(100); + }); + + it("flags large transaction values", () => { + const tx = { value: "0x" + BigInt("200000000000000000").toString(16) }; + const { findings } = analyzeTransactionMevRisks(tx, "0x" + BigInt("20000000000").toString(16)); + expect(findings.some((f) => f.label === "Large transaction value")).toBe(true); + }); + + it("flags high gas prices", () => { + const highGas = "0x" + (BigInt("20000000000") * BigInt(130) / BigInt(100)).toString(16); + const currentGas = "0x" + BigInt("20000000000").toString(16); + const tx = { gasPrice: highGas }; + const { findings } = analyzeTransactionMevRisks(tx, currentGas); + expect(findings.some((f) => f.label === "High gas price")).toBe(true); + }); + + it("score is 0โ€“100", () => { + const tx = {}; + const { score } = analyzeTransactionMevRisks(tx, "0x" + BigInt("20000000000").toString(16)); + expect(score).toBeGreaterThanOrEqual(0); + expect(score).toBeLessThanOrEqual(100); + }); +}); + +describe("fetchTransaction", () => { + beforeEach(() => { + vi.stubGlobal("fetch", vi.fn()); + }); + afterEach(() => { + vi.unstubAllGlobals(); + }); + + it("returns transaction data from RPC", async () => { + const mockTx = { + hash: "0x" + "a".repeat(64), + from: "0x" + "1".repeat(40), + to: "0x" + "2".repeat(40), + value: "0x0", + }; + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: mockTx }), + }); + const result = await fetchTransaction("0x" + "a".repeat(64), "https://bsc-dataseed.bnbchain.org"); + expect(result.hash).toBe(mockTx.hash); + }); + + it("throws on RPC error", async () => { + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ error: { message: "Transaction not found" } }), + }); + await expect(fetchTransaction("0x" + "a".repeat(64), "https://bsc-dataseed.bnbchain.org")).rejects.toThrow(); + }); +}); + +describe("fetchCurrentGasPrice", () => { + beforeEach(() => { + vi.stubGlobal("fetch", vi.fn()); + }); + afterEach(() => { + vi.unstubAllGlobals(); + }); + + it("returns gas price from RPC", async () => { + const mockGasPrice = "0x" + BigInt("20000000000").toString(16); + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: mockGasPrice }), + }); + const result = await fetchCurrentGasPrice("https://bsc-dataseed.bnbchain.org"); + expect(result).toBe(mockGasPrice); + }); + + it("throws on RPC error", async () => { + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ error: { message: "RPC error" } }), + }); + await expect(fetchCurrentGasPrice("https://bsc-dataseed.bnbchain.org")).rejects.toThrow(); + }); +}); + +describe("fetchContractCode", () => { + beforeEach(() => { + vi.stubGlobal("fetch", vi.fn()); + }); + afterEach(() => { + vi.unstubAllGlobals(); + }); + + it("returns contract code and isContract=true for contract", async () => { + const mockCode = "0x6080604052348015600f57600080fd5b50"; + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: mockCode }), + }); + const result = await fetchContractCode("0x" + "1".repeat(40), "https://bsc-dataseed.bnbchain.org"); + expect(result.code).toBe(mockCode); + expect(result.isContract).toBe(true); + }); + + it("returns isContract=false for EOA", async () => { + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: "0x" }), + }); + const result = await fetchContractCode("0x" + "1".repeat(40), "https://bsc-dataseed.bnbchain.org"); + expect(result.isContract).toBe(false); + }); +}); + +describe("analyzeMevRisk", () => { + beforeEach(() => { + vi.stubGlobal("fetch", vi.fn()); + }); + afterEach(() => { + vi.unstubAllGlobals(); + }); + + it("analyzes transaction hash", async () => { + const mockTx = { + hash: "0x" + "a".repeat(64), + input: "0x38ed1739" + "0".repeat(56), + value: "0x0", + }; + const mockGasPrice = "0x" + BigInt("20000000000").toString(16); + + (globalThis.fetch as ReturnType) + .mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: mockGasPrice }), + }) + .mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: mockTx }), + }); + + const result = await analyzeMevRisk("0x" + "a".repeat(64), "https://bsc-dataseed.bnbchain.org"); + expect(result.transactionHash).toBe("0x" + "a".repeat(64)); + expect(result.contractType).toBe("Transaction"); + expect(result.riskScore).toBeGreaterThanOrEqual(0); + expect(result.riskScore).toBeLessThanOrEqual(100); + }); + + it("analyzes contract address", async () => { + const mockCode = "0x6080604052348015600f57600080fd5b50"; + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: mockCode }), + }); + + const result = await analyzeMevRisk("0x" + "1".repeat(40), "https://bsc-dataseed.bnbchain.org"); + expect(result.address).toBe("0x" + "1".repeat(40)); + expect(result.contractType).toBe("Contract"); + expect(result.riskScore).toBeGreaterThanOrEqual(0); + expect(result.riskScore).toBeLessThanOrEqual(100); + }); + + it("analyzes EOA address", async () => { + (globalThis.fetch as ReturnType).mockResolvedValueOnce({ + ok: true, + json: async () => ({ result: "0x" }), + }); + + const result = await analyzeMevRisk("0x" + "1".repeat(40), "https://bsc-dataseed.bnbchain.org"); + expect(result.contractType).toBe("EOA"); + expect(result.riskScore).toBeGreaterThanOrEqual(90); + }); + + it("throws on invalid input", async () => { + await expect(analyzeMevRisk("invalid", "https://bsc-dataseed.bnbchain.org")).rejects.toThrow(); + }); +}); diff --git a/typescript/mev-risk-meter/app.ts b/typescript/mev-risk-meter/app.ts new file mode 100644 index 0000000..263d7d7 --- /dev/null +++ b/typescript/mev-risk-meter/app.ts @@ -0,0 +1,437 @@ +/** + * MEV Risk Meter โ€” BSC transaction and contract MEV risk analysis. + * Analyzes transactions and contracts for front-running, sandwich attacks, and other MEV risks. + */ + +import express from "express"; +import { readFileSync } from "fs"; +import { dirname, join } from "path"; +import { fileURLToPath } from "url"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); + +const PORT = Number(process.env.PORT) || 3000; +const BSC_RPC_URL = process.env.BSC_RPC_URL || "https://bsc-dataseed.bnbchain.org"; + +export type RiskLevel = "low" | "medium" | "high" | "critical"; + +export interface MevRiskFinding { + level: RiskLevel; + label: string; + description: string; +} + +export interface MevRiskResult { + address: string; + riskScore: number; + riskLabel: string; + findings: MevRiskFinding[]; + transactionHash?: string; + contractType?: string; +} + +interface TransactionData { + hash?: string; + from?: string; + to?: string; + value?: string; + input?: string; + gasPrice?: string; + gas?: string; +} + +interface ContractAbi { + type?: string; + name?: string; + stateMutability?: string; + inputs?: Array<{ name?: string; type?: string }>; + outputs?: Array<{ name?: string; type?: string }>; +} + +/** Normalize address to checksum-friendly lowercase 0x form. */ +export function normalizeAddress(addr: string): string { + const s = String(addr).trim(); + if (!/^0x[a-fA-F0-9]{40}$/.test(s)) return ""; + return s.toLowerCase().replace(/^0x/, "0x"); +} + +/** Check if string looks like a valid BSC address. */ +export function isValidBscAddress(addr: string): boolean { + return /^0x[a-fA-F0-9]{40}$/.test(String(addr).trim()); +} + +/** Check if string looks like a valid transaction hash. */ +export function isValidTxHash(hash: string): boolean { + return /^0x[a-fA-F0-9]{64}$/.test(String(hash).trim()); +} + +/** Check if ABI contains swap-related functions. */ +export function hasSwapFunctions(abi: ContractAbi[]): boolean { + const swapKeywords = [ + "swap", + "swapExact", + "swapTokens", + "swapETH", + "swapExactTokens", + "swapTokensForExact", + "addLiquidity", + "removeLiquidity", + ]; + const names = new Set(abi.map((a) => (a.name || "").toLowerCase()).filter(Boolean)); + return swapKeywords.some((kw) => Array.from(names).some((n) => n.includes(kw))); +} + +/** Check if ABI contains price oracle dependencies. */ +export function hasPriceOracleDependencies(abi: ContractAbi[]): boolean { + const oracleKeywords = ["getPrice", "latestRoundData", "getLatestPrice", "oracle", "priceFeed"]; + const names = new Set(abi.map((a) => (a.name || "").toLowerCase()).filter(Boolean)); + return oracleKeywords.some((kw) => Array.from(names).some((n) => n.includes(kw.toLowerCase()))); +} + +/** Check if ABI contains flash loan functions. */ +export function hasFlashLoanFunctions(abi: ContractAbi[]): boolean { + const flashLoanKeywords = ["flashLoan", "flashloan", "flashBorrow", "borrow"]; + const names = new Set(abi.map((a) => (a.name || "").toLowerCase()).filter(Boolean)); + return flashLoanKeywords.some((kw) => Array.from(names).some((n) => n.includes(kw))); +} + +/** Check if transaction input suggests a swap operation. */ +export function isSwapTransaction(input: string): boolean { + const swapSignatures = [ + "0x38ed1739", // swapExactTokensForTokens + "0x7ff36ab5", // swapExactETHForTokens + "0x18cbafe5", // swapExactTokensForETH + "0x4a25d94a", // swapTokensForExactTokens + "0x8803dbee", // swapTokensForExactETH + "0xb6f9de95", // swapExactETHForTokensSupportingFeeOnTransferTokens + ]; + const normalized = input.toLowerCase(); + return swapSignatures.some((sig) => normalized.startsWith(sig)); +} + +/** Check if transaction has high gas price (potential front-running). */ +export function hasHighGasPrice(gasPrice: string, currentGasPrice: string): boolean { + try { + const txGas = BigInt(gasPrice); + const currentGas = BigInt(currentGasPrice); + // If transaction gas price is > 20% higher than current, it's suspicious + return txGas > (currentGas * BigInt(120)) / BigInt(100); + } catch { + return false; + } +} + +/** Check if transaction value is significant (sandwich attack target). */ +export function hasSignificantValue(value: string): boolean { + try { + // 1 BNB = 10^18 wei, check if > 0.1 BNB + const val = BigInt(value); + const threshold = BigInt("100000000000000000"); // 0.1 BNB + return val > threshold; + } catch { + return false; + } +} + +/** Analyze contract ABI for MEV risks. */ +export function analyzeContractMevRisks(abi: ContractAbi[]): { score: number; findings: MevRiskFinding[] } { + const findings: MevRiskFinding[] = []; + let score = 100; + + const hasSwap = hasSwapFunctions(abi); + if (hasSwap) { + findings.push({ + level: "high", + label: "Swap functions detected", + description: + "Contract contains swap functions. These are prime targets for sandwich attacks and front-running.", + }); + score -= 25; + } + + const hasOracle = hasPriceOracleDependencies(abi); + if (hasOracle) { + findings.push({ + level: "medium", + label: "Price oracle dependencies", + description: + "Contract relies on price oracles. Oracle manipulation or front-running can lead to MEV extraction.", + }); + score -= 15; + } + + const hasFlashLoan = hasFlashLoanFunctions(abi); + if (hasFlashLoan) { + findings.push({ + level: "critical", + label: "Flash loan functions", + description: + "Contract supports flash loans. Flash loans enable sophisticated MEV attacks including arbitrage and liquidation.", + }); + score -= 30; + } + + // Check for unprotected external calls + const hasExternalCalls = abi.some( + (item) => + item.type === "function" && + (item.stateMutability === "payable" || item.stateMutability === "nonpayable") && + item.name && + !item.name.toLowerCase().includes("view") && + !item.name.toLowerCase().includes("get") + ); + if (hasExternalCalls && hasSwap) { + findings.push({ + level: "high", + label: "Unprotected swap operations", + description: + "Swap functions without access controls or slippage protection are vulnerable to front-running.", + }); + score -= 20; + } + + score = Math.max(0, Math.min(100, score)); + return { score, findings }; +} + +/** Analyze transaction for MEV risks. */ +export function analyzeTransactionMevRisks( + tx: TransactionData, + currentGasPrice: string +): { score: number; findings: MevRiskFinding[] } { + const findings: MevRiskFinding[] = []; + let score = 100; + + if (tx.input && isSwapTransaction(tx.input)) { + findings.push({ + level: "high", + label: "Swap transaction detected", + description: + "This is a swap transaction. Swaps are commonly targeted by sandwich attacks and front-running bots.", + }); + score -= 25; + } + + if (tx.value && hasSignificantValue(tx.value)) { + findings.push({ + level: "medium", + label: "Large transaction value", + description: + "Transaction involves significant value (>0.1 BNB). Large transactions are more attractive MEV targets.", + }); + score -= 15; + } + + if (tx.gasPrice && hasHighGasPrice(tx.gasPrice, currentGasPrice)) { + findings.push({ + level: "high", + label: "High gas price", + description: + "Transaction uses gas price >20% above current average. This may indicate front-running attempt or priority.", + }); + score -= 20; + } + + if (tx.input && tx.input.length > 10 && !isSwapTransaction(tx.input)) { + // Complex transaction with data + findings.push({ + level: "low", + label: "Complex transaction", + description: + "Transaction contains complex call data. Review contract interactions for potential MEV vectors.", + }); + score -= 5; + } + + score = Math.max(0, Math.min(100, score)); + return { score, findings }; +} + +/** Fetch transaction data from BSC RPC. */ +export async function fetchTransaction(txHash: string, rpcUrl: string): Promise { + const response = await fetch(rpcUrl, { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ + jsonrpc: "2.0", + method: "eth_getTransactionByHash", + params: [txHash], + id: 1, + }), + }); + + if (!response.ok) throw new Error(`RPC HTTP ${response.status}`); + + const json = (await response.json()) as { result?: TransactionData; error?: { message?: string } }; + if (json.error) throw new Error(json.error.message || "RPC error"); + if (!json.result) throw new Error("Transaction not found"); + + return json.result; +} + +/** Fetch current gas price from BSC RPC. */ +export async function fetchCurrentGasPrice(rpcUrl: string): Promise { + const response = await fetch(rpcUrl, { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ + jsonrpc: "2.0", + method: "eth_gasPrice", + params: [], + id: 1, + }), + }); + + if (!response.ok) throw new Error(`RPC HTTP ${response.status}`); + + const json = (await response.json()) as { result?: string; error?: { message?: string } }; + if (json.error) throw new Error(json.error.message || "RPC error"); + if (!json.result) throw new Error("Failed to fetch gas price"); + + return json.result; +} + +/** Fetch contract code and attempt to get ABI (simplified - in production use BSCTrace API). */ +export async function fetchContractCode(address: string, rpcUrl: string): Promise<{ code: string; isContract: boolean }> { + const response = await fetch(rpcUrl, { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ + jsonrpc: "2.0", + method: "eth_getCode", + params: [address, "latest"], + id: 1, + }), + }); + + if (!response.ok) throw new Error(`RPC HTTP ${response.status}`); + + const json = (await response.json()) as { result?: string; error?: { message?: string } }; + if (json.error) throw new Error(json.error.message || "RPC error"); + if (!json.result) throw new Error("Failed to fetch contract code"); + + const code = json.result || ""; + return { code, isContract: code !== "0x" && code.length > 2 }; +} + +/** Analyze address (contract or transaction) for MEV risks. */ +export async function analyzeMevRisk( + input: string, + rpcUrl: string +): Promise { + let riskScore = 100; + let riskLabel = "Low risk"; + const findings: MevRiskFinding[] = []; + let transactionHash: string | undefined; + let contractType: string | undefined; + + // Determine if input is a transaction hash or contract address + if (isValidTxHash(input)) { + // Analyze transaction + transactionHash = input.toLowerCase().startsWith("0x") ? input.toLowerCase() : "0x" + input.toLowerCase(); + const currentGasPrice = await fetchCurrentGasPrice(rpcUrl); + const tx = await fetchTransaction(transactionHash, rpcUrl); + const { score, findings: txFindings } = analyzeTransactionMevRisks(tx, currentGasPrice); + riskScore = score; + findings.push(...txFindings); + contractType = "Transaction"; + } else if (isValidBscAddress(input)) { + // Analyze contract + const address = normalizeAddress(input); + const { isContract } = await fetchContractCode(address, rpcUrl); + + if (!isContract) { + findings.push({ + level: "low", + label: "EOA (Externally Owned Account)", + description: "This is a regular wallet address, not a contract. MEV risks are minimal.", + }); + riskScore = 95; + contractType = "EOA"; + } else { + // For contract analysis, we'd ideally fetch ABI from BSCTrace API + // For this demo, we'll use heuristics based on common patterns + findings.push({ + level: "medium", + label: "Contract address", + description: + "This is a smart contract. To fully analyze MEV risks, contract ABI and source code should be reviewed.", + }); + riskScore = 70; + contractType = "Contract"; + + // Add generic contract warnings + findings.push({ + level: "medium", + label: "Contract MEV risk assessment", + description: + "Contracts with swap functions, price oracles, or flash loans are at higher MEV risk. Review contract source code for detailed analysis.", + }); + } + } else { + throw new Error("Invalid input. Provide a BSC transaction hash (0x64 hex) or contract address (0x40 hex)."); + } + + // Determine risk label + if (riskScore >= 80) riskLabel = "Low risk"; + else if (riskScore >= 60) riskLabel = "Medium risk"; + else if (riskScore >= 40) riskLabel = "High risk"; + else riskLabel = "Critical risk"; + + return { + address: isValidTxHash(input) ? transactionHash! : normalizeAddress(input), + riskScore, + riskLabel, + findings, + transactionHash, + contractType, + }; +} + +function main(): void { + const app = express(); + app.use(express.json()); + + app.get("/", (_req, res) => { + res.setHeader("Content-Type", "text/html; charset=utf-8"); + res.send(readFileSync(join(__dirname, "..", "frontend.html"), "utf-8")); + }); + + app.get("/api/analyze", async (req, res) => { + const input = (req.query.input as string)?.trim(); + if (!input) { + res.status(400).json({ error: "Missing query parameter: input" }); + return; + } + + try { + const result = await analyzeMevRisk(input, BSC_RPC_URL); + res.json(result); + } catch (e) { + const msg = e instanceof Error ? e.message : "Analysis failed"; + res.status(500).json({ error: msg }); + } + }); + + function tryListen(port: number): void { + const server = app.listen(port, () => { + console.log(`MEV Risk Meter running at http://localhost:${port}`); + }); + server.on("error", (err: NodeJS.ErrnoException) => { + server.close(); + if (err.code === "EADDRINUSE" && port < PORT + 5) { + const next = port + 1; + console.warn(`Port ${port} in use, trying ${next}...`); + tryListen(next); + } else { + console.error(err.code === "EADDRINUSE" + ? `Port ${port} in use. Set PORT in .env or stop the other process.` + : err); + process.exit(1); + } + }); + } + tryListen(PORT); +} + +if (process.env.VITEST !== "true") main(); diff --git a/typescript/mev-risk-meter/clone-and-run.sh b/typescript/mev-risk-meter/clone-and-run.sh new file mode 100644 index 0000000..132e302 --- /dev/null +++ b/typescript/mev-risk-meter/clone-and-run.sh @@ -0,0 +1,42 @@ +#!/usr/bin/env bash +set -euo pipefail + +# Run from project root (directory containing this script) +ROOT="$(cd "$(dirname "$0")" && pwd)" +cd "$ROOT" + +echo ">> MEV Risk Meter โ€” clone-and-run" +echo ">> Project root: $ROOT" +echo "" + +echo ">> Installing dependencies..." +npm install + +echo "" +echo ">> Seeding .env from .env.example..." +if [[ -f .env.example ]]; then + cp -n .env.example .env + echo " .env ready. Using default BSC RPC URL." +else + echo "BSC_RPC_URL=https://bsc-dataseed.bnbchain.org" > .env + echo "PORT=3000" >> .env + echo " .env created with default BSC RPC URL." +fi + +echo "" +echo ">> Building..." +npm run build + +echo "" +echo ">> Running tests..." +npm test + +echo "" +echo ">> Starting server..." +# Load .env so BSC_RPC_URL and PORT are available for the app +set -a +# shellcheck disable=SC1091 +source .env 2>/dev/null || true +set +a +echo " Open http://localhost:${PORT:-3000} in your browser. Use Ctrl+C to stop." +npm start diff --git a/typescript/mev-risk-meter/frontend.html b/typescript/mev-risk-meter/frontend.html new file mode 100644 index 0000000..cc40de1 --- /dev/null +++ b/typescript/mev-risk-meter/frontend.html @@ -0,0 +1,369 @@ + + + + + + MEV Risk Meter โ€” BSC + + + + + + +
+ +
+

Analyze MEV risk

+
+ + +
+ + +
+
+ + + diff --git a/typescript/mev-risk-meter/mev-risk-meter.png b/typescript/mev-risk-meter/mev-risk-meter.png new file mode 100644 index 0000000..2d7afa1 Binary files /dev/null and b/typescript/mev-risk-meter/mev-risk-meter.png differ diff --git a/typescript/mev-risk-meter/package-lock.json b/typescript/mev-risk-meter/package-lock.json new file mode 100644 index 0000000..b8cb26d --- /dev/null +++ b/typescript/mev-risk-meter/package-lock.json @@ -0,0 +1,2934 @@ +{ + "name": "mev-risk-meter", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "mev-risk-meter", + "version": "1.0.0", + "dependencies": { + "express": "^4.21.0" + }, + "devDependencies": { + "@types/express": "^4.17.21", + "@types/node": "^22.9.0", + "tsx": "^4.19.2", + "typescript": "^5.6.3", + "vitest": "^2.1.4" + }, + "engines": { + "node": ">=18" + } + }, + "node_modules/@esbuild/aix-ppc64": { + "version": "0.27.2", + "resolved": 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"module", + "main": "dist/app.js", + "scripts": { + "build": "tsc", + "start": "node dist/app.js", + "test": "vitest run", + "dev": "tsx watch app.ts" + }, + "engines": { + "node": ">=18" + }, + "dependencies": { + "express": "^4.21.0" + }, + "devDependencies": { + "@types/express": "^4.17.21", + "@types/node": "^22.9.0", + "tsx": "^4.19.2", + "typescript": "^5.6.3", + "vitest": "^2.1.4" + } +} diff --git a/typescript/mev-risk-meter/tsconfig.json b/typescript/mev-risk-meter/tsconfig.json new file mode 100644 index 0000000..a76c582 --- /dev/null +++ b/typescript/mev-risk-meter/tsconfig.json @@ -0,0 +1,16 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "outDir": "dist", + "rootDir": ".", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "resolveJsonModule": true, + "types": ["node"] + }, + "include": ["app.ts"], + "exclude": ["node_modules", "dist", "**/*.test.ts"] +} diff --git a/typescript/mev-risk-meter/vitest.config.ts b/typescript/mev-risk-meter/vitest.config.ts new file mode 100644 index 0000000..d95da2b --- /dev/null +++ b/typescript/mev-risk-meter/vitest.config.ts @@ -0,0 +1,16 @@ +import { defineConfig } from "vitest/config"; +import { resolve } from "path"; + +export default defineConfig({ + test: { + globals: true, + environment: "node", + include: ["**/*.test.ts"], + env: { VITEST: "true" }, + }, + resolve: { + alias: { + "@": resolve(__dirname, "."), + }, + }, +});