[INFRA] Build Multi-Chain Live Gas Price & Historical Fee Indexer

[mijinummi]

Labels: high-difficulty, infrastructure, oracle
Difficulty: High
Module: apps/api/src/gas-oracle/

---

🧠 Concept

Construct an automated background service in the Nest.js backend that indexes real-time gas prices and native token rates ($ETH, XLM, OP, ARB$) across 10+ supported networks.

⚠️ Problem

Static gas estimates become outdated as token prices and network base fees fluctuate daily. Live price indexing ensures monetary savings calculations remain accurate.

📁 Implementation Scope

• apps/api/src/gas-oracle/fee-indexer.service.ts
• apps/api/src/gas-oracle/price-feed.service.ts

🛠️ Requirements

1. Query real-time RPC gas fees (EIP-1559 base/priority fees, Soroban resource fees) every 30 seconds.
2. Fetch native token prices via cached market feeds.
3. Expose dynamic conversion APIs used by the diagnostic engine to compute accurate USD values.

🎯 Acceptance Criteria

• Maintains real-time gas fee and token price states in Redis.
• Falls back gracefully to cached baseline values if price APIs experience downtime.

[bigpoppaofny]

@bigpoppaofny has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would love to work on this issue immediately

ℹ️ Repo Maintainers: To accept this application, review their application or assign @bigpoppaofny to this issue.

[Divineifed1]

@Divineifed1 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Kindly assign me so I Can efficiently implement this task

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Divineifed1 to this issue.

[Yerimahjr]

@Yerimahjr has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I'd like to work on this issue. I have experience building scalable NestJS/Node.js backend services, integrating blockchain infrastructure, and working with the Stellar/Soroban ecosystem. I'm comfortable implementing background indexing services, consuming RPC and market data feeds, caching state in Redis, and designing resilient fallback mechanisms for external dependencies. I'll build a modular fee and price indexing service that keeps gas and token prices up to date, exposes reliable conversion APIs, handles API failures gracefully using cached data, and includes comprehensive testing and documentation. Looking forward to contributing to this infrastructure enhancement.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Yerimahjr to this issue.

[SharifIbrahimDev]

@SharifIbrahimDev has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @SharifIbrahimDev to this issue.

[drips-wave]

Congratulations, @Divineifed1! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Divineifed1: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@Divineifed1's PR #626 was approved and merged by @mijinummi.

🏆 @Divineifed1: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (977 total points). Track your full progress on GrantFox.

👏 Great work, @Divineifed1! Keep contributing to MDTechLabs.

[drips-wave]

This issue has been completed by @Divineifed1 as part of the Stellar Wave Program's 7th Wave 🥳

😎 @Divineifed1: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.