diff --git a/README.md b/README.md
index 89ae4be..a23e51e 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@
 </p>
 
 <p align="center">
-  <img src="https://img.shields.io/badge/version-0.2.17-blue" alt="Version 0.2.17" />
+  <img src="https://img.shields.io/badge/version-0.2.18-blue" alt="Version 0.2.18" />
   <img src="https://img.shields.io/badge/A2A-v0.3.0-blueviolet" alt="A2A v0.3.0" />
   <img src="https://img.shields.io/badge/license-MIT-green" alt="MIT License" />
   <img src="https://img.shields.io/badge/status-beta-orange" alt="Status: Beta" />
@@ -235,7 +235,8 @@ Each agent has an A2A Agent Card describing its capabilities:
   ],
   "capabilities": { "streaming": false, "pushNotifications": false },
   "defaultInputModes": ["text/plain"],
-  "defaultOutputModes": ["text/plain"]
+  "defaultOutputModes": ["text/plain"],
+  "fundingAddress": "0x742d...8f4a"
 }
 ```
 
@@ -449,7 +450,7 @@ The protocol version is defined in a single place:
 
 ```typescript
 // protocol/src/types.ts
-export const REEF_VERSION = "0.2.17";
+export const REEF_VERSION = "0.2.18";
 export const A2A_PROTOCOL_VERSION = "0.3.0";
 ```
 
diff --git a/client/package.json b/client/package.json
index bc2d0b9..fb8ee02 100644
--- a/client/package.json
+++ b/client/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@reef-protocol/client",
-  "version": "0.2.17",
+  "version": "0.2.18",
   "description": "Reef Protocol client — daemon, CLI, and identity management",
   "type": "module",
   "main": "dist/daemon.js",
diff --git a/directory/package.json b/directory/package.json
index 8ca046d..b9013bc 100644
--- a/directory/package.json
+++ b/directory/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@reef-protocol/directory",
   "private": true,
-  "version": "0.2.17",
+  "version": "0.2.18",
   "description": "Reef Protocol directory server — agent discovery and network stats",
   "type": "module",
   "main": "dist/index.js",
diff --git a/directory/src/migrations/00011_add-funding-address.ts b/directory/src/migrations/00011_add-funding-address.ts
new file mode 100644
index 0000000..2d45907
--- /dev/null
+++ b/directory/src/migrations/00011_add-funding-address.ts
@@ -0,0 +1,16 @@
+import { DataTypes, type Sequelize } from "sequelize";
+
+export async function up({ context: sequelize }: { context: Sequelize }) {
+  const qi = sequelize.getQueryInterface();
+
+  await qi.addColumn("agents", "funding_address", {
+    type: DataTypes.STRING(42),
+    allowNull: true,
+    defaultValue: null,
+  });
+}
+
+export async function down({ context: sequelize }: { context: Sequelize }) {
+  const qi = sequelize.getQueryInterface();
+  await qi.removeColumn("agents", "funding_address");
+}
diff --git a/directory/src/models/Agent.ts b/directory/src/models/Agent.ts
index 24dd4cd..6af9ec6 100644
--- a/directory/src/models/Agent.ts
+++ b/directory/src/models/Agent.ts
@@ -20,6 +20,7 @@ export interface AgentAttributes {
   reputation_updated_at: Date | null;
   country: string | null;
   icon_url: string | null;
+  funding_address: string | null;
 }
 
 export class Agent extends Model<AgentAttributes> {
@@ -41,6 +42,7 @@ export class Agent extends Model<AgentAttributes> {
   declare reputation_updated_at: Date | null;
   declare country: string | null;
   declare icon_url: string | null;
+  declare funding_address: string | null;
   declare readonly created_at: Date;
   declare readonly updated_at: Date;
 }
@@ -133,6 +135,11 @@ export function initAgentModel(sequelize: Sequelize): void {
         allowNull: true,
         defaultValue: null,
       },
+      funding_address: {
+        type: DataTypes.STRING(42),
+        allowNull: true,
+        defaultValue: null,
+      },
     },
     {
       sequelize,
diff --git a/directory/src/routes/agents.ts b/directory/src/routes/agents.ts
index 29fced3..55e35d5 100644
--- a/directory/src/routes/agents.ts
+++ b/directory/src/routes/agents.ts
@@ -56,6 +56,8 @@ agentsRouter.post("/register", registrationLimiter, async (req, res, next) => {
     const skillTags = agentCard.skills.flatMap((s) => s.tags);
     const iconUrl = (agentCard as unknown as Record<string, unknown>)
       .iconUrl as string | undefined;
+    const fundingAddress = (agentCard as unknown as Record<string, unknown>)
+      .fundingAddress as string | undefined;
 
     let agent = await Agent.findByPk(addr);
 
@@ -70,6 +72,7 @@ agentsRouter.post("/register", registrationLimiter, async (req, res, next) => {
         last_heartbeat: new Date(),
         agent_card: agentCard,
         icon_url: iconUrl || agent.icon_url,
+        funding_address: fundingAddress || agent.funding_address,
       });
     } else {
       agent = await Agent.create({
@@ -90,6 +93,7 @@ agentsRouter.post("/register", registrationLimiter, async (req, res, next) => {
         app_interactions: {},
         reputation_updated_at: null,
         icon_url: iconUrl || null,
+        funding_address: fundingAddress || null,
       });
     }
 
@@ -152,6 +156,7 @@ agentsRouter.get("/search", searchLimiter, async (req, res, next) => {
         availability: a.availability,
         agentCard: a.agent_card,
         iconUrl: a.icon_url ?? null,
+        fundingAddress: a.funding_address ?? null,
         registeredAt: a.created_at?.toISOString(),
         lastHeartbeat: a.last_heartbeat?.toISOString(),
         reputationScore: a.reputation_score,
@@ -378,6 +383,7 @@ agentsRouter.get("/:address", readLimiter, async (req, res, next) => {
       tasksFailed: agent.tasks_failed,
       totalInteractions: agent.total_interactions,
       country: agent.country ?? null,
+      fundingAddress: agent.funding_address ?? null,
     });
   } catch (err) {
     next(err);
diff --git a/package.json b/package.json
index d2612d3..30e9b55 100644
--- a/package.json
+++ b/package.json
@@ -32,5 +32,5 @@
     "typescript-eslint": "^8.56.0",
     "vitest": "^3.0.0"
   },
-  "version": "0.2.17"
+  "version": "0.2.18"
 }
diff --git a/protocol/package.json b/protocol/package.json
index de5d73d..789654c 100644
--- a/protocol/package.json
+++ b/protocol/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@reef-protocol/protocol",
-  "version": "0.2.17",
+  "version": "0.2.18",
   "description": "Shared message types, envelope codec, and validation for Reef Protocol",
   "type": "module",
   "main": "dist/index.js",
diff --git a/protocol/src/builders.ts b/protocol/src/builders.ts
index 8e3e42a..04f6c1d 100644
--- a/protocol/src/builders.ts
+++ b/protocol/src/builders.ts
@@ -84,7 +84,7 @@ export function buildReefAgentCard(
   name: string,
   description: string,
   skills: AgentSkill[],
-  options?: { iconUrl?: string },
+  options?: { iconUrl?: string; fundingAddress?: string },
 ): AgentCard {
   const card: AgentCard = {
     name,
@@ -105,6 +105,10 @@ export function buildReefAgentCard(
   if (options?.iconUrl) {
     (card as unknown as Record<string, unknown>).iconUrl = options.iconUrl;
   }
+  if (options?.fundingAddress) {
+    (card as unknown as Record<string, unknown>).fundingAddress =
+      options.fundingAddress;
+  }
   return card;
 }
 
diff --git a/protocol/src/types.ts b/protocol/src/types.ts
index 020b4ca..a1fb0e6 100644
--- a/protocol/src/types.ts
+++ b/protocol/src/types.ts
@@ -2,7 +2,7 @@
 
 import type { AgentCard } from "@a2a-js/sdk";
 
-export const REEF_VERSION = "0.2.17";
+export const REEF_VERSION = "0.2.18";
 export const A2A_PROTOCOL_VERSION = "0.3.0";
 export const DEFAULT_DIRECTORY_URL =
   "https://reef-protocol-production.up.railway.app";
@@ -104,6 +104,8 @@ export interface AgentSearchResult {
   agentCard: AgentCard | null;
   /** URL to an icon/avatar image for this agent */
   iconUrl?: string | null;
+  /** Base wallet address for receiving USDC payments */
+  fundingAddress?: string | null;
   registeredAt?: string;
   lastHeartbeat?: string;
   reputationScore?: number;
diff --git a/protocol/src/validation.ts b/protocol/src/validation.ts
index b03eab4..f4aeb0e 100644
--- a/protocol/src/validation.ts
+++ b/protocol/src/validation.ts
@@ -116,6 +116,7 @@ export const agentCardSchema = z.object({
   defaultOutputModes: z.array(z.string()),
   preferredTransport: z.string().optional(),
   iconUrl: z.string().url().optional(),
+  fundingAddress: z.string().optional(),
   provider: z
     .object({
       organization: z.string(),