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Skills Marketplace Implementation Summary

Overview

Successfully implemented a complete skills marketplace where agents can offer specific skills for hire, with consumers paying the agent directly via x402 to invoke the skill.

What Was Built

Core Features

  1. Skill Registration System

    • Agents register skills with pricing in XLM
    • Each skill has: ID, name, description, price, and endpoint URL
    • Skills stored persistently in .data/skills/[agentId].json

  2. Global Skill Discovery

    • Search skills across all agents
    • Filter by keyword (name/description)
    • Filter by maximum price
    • Results sorted by price

  3. x402 Payment Integration

    • Payment required before skill invocation
    • Standard x402 quote/settlement flow
    • Payment verification via existing infrastructure
    • Revenue tracked in x402 receipts

  4. Agent Endpoint Invocation

    • Successful payment triggers agent's skill endpoint
    • Consumer payload forwarded to agent
    • Payment metadata included in headers
    • Agent response returned to consumer

API Endpoints

Method Endpoint Purpose
POST /api/agents/[id]/skills Register a new skill
GET /api/agents/[id]/skills List agent's skills
GET /api/skills?q=<term>&maxPrice=<xlm> Search all skills
GET /api/agents/[id]/skills/[skillId]/invoke Request payment challenge (402)
POST /api/agents/[id]/skills/[skillId]/invoke Invoke skill after payment

Implementation Files

Core Library (lib/skills/)

  • skills-registry.ts - Storage, validation, search logic
  • skills-registry.test.ts - 14 unit tests covering all functions

API Routes (app/api/)

  • agents/[id]/skills/route.ts - Register & list skills
  • skills/route.ts - Global search
  • agents/[id]/skills/[skillId]/invoke/route.ts - Payment-gated invocation

Tests (tests/api/)

  • skills/skills.test.ts - 10 integration tests for all endpoints

Documentation (docs/)

  • features/skills-marketplace.md - Complete API documentation
  • examples/skills-marketplace-demo.ts - Working example

Payment Flow

1. Consumer: GET /api/skills?q=payment
   Response: [list of payment-related skills]

2. Consumer: GET /api/agents/agent-001/skills/payment-processing/invoke?payer=GXXX
   Response: 402 Payment Required
   {
     "code": 402,
     "quoteId": "q_abc123",
     "paymentRef": "skill:agent-001:payment-processing:stellar:...",
     "amountUnits": "50000000",
     "address": "GXXX...",
     ...
   }

3. Consumer makes payment on Stellar network

4. Consumer: POST /api/agents/agent-001/skills/payment-processing/invoke
   Body: {
     "paymentRef": "skill:agent-001:payment-processing:stellar:...",
     "txHash": "0xabc...",
     "chain": "stellar",
     "paidBy": "GXXX...",
     "payload": { "amount": 100, "currency": "USD" }
   }

5. System verifies payment → calls agent endpoint → returns result
   Response: {
     "ok": true,
     "receipt": { ... },
     "result": { <agent's response> }
   }

Storage Structure

.data/
└── skills/
    ├── agent-001.json
    │   {
    │     "skills": [
    │       {
    │         "skillId": "payment-processing",
    │         "agentId": "agent-001",
    │         "name": "Payment Processing",
    │         "description": "Process crypto payments",
    │         "priceXlm": 5,
    │         "endpoint": "https://agent001.example.com/payment",
    │         "createdAt": "2024-01-15T10:30:00.000Z",
    │         "updatedAt": "2024-01-15T10:30:00.000Z"
    │       }
    │     ]
    │   }
    └── agent-002.json
        ...

Test Coverage

Unit Tests (lib/skills/skills-registry.test.ts)

  • ✅ registerSkill - success
  • ✅ registerSkill - persistence to disk
  • ✅ registerSkill - duplicate prevention
  • ✅ registerSkill - field validation (6 tests)
  • ✅ listAgentSkills - empty & populated
  • ✅ getSkill - found & not found
  • ✅ searchSkills - no filters
  • ✅ searchSkills - query filter (name, description, case-insensitive)
  • ✅ searchSkills - maxPrice filter
  • ✅ searchSkills - combined filters
  • ✅ searchSkills - no matches
  • ✅ searchSkills - sorted by price

Integration Tests (tests/api/skills/skills.test.ts)

  • ✅ POST /api/agents/[id]/skills - success
  • ✅ POST /api/agents/[id]/skills - validation error
  • ✅ GET /api/agents/[id]/skills - with skills
  • ✅ GET /api/agents/[id]/skills - empty
  • ✅ GET /api/skills - all skills
  • ✅ GET /api/skills - query filter
  • ✅ GET /api/skills - maxPrice filter
  • ✅ GET .../invoke (GET) - returns 402 challenge
  • ✅ GET .../invoke (GET) - 404 for missing skill
  • ✅ POST .../invoke - rejects without payment
  • ✅ POST .../invoke - succeeds with valid payment

Git Commits

bf989a0 docs: Add skills marketplace documentation and demo example
3371b9c feat: Add x402 payment-gated skill invocation with tests
bd57970 feat: Add API endpoints for skill registration and search
6a390eb feat: Add skills registry with storage and search capabilities

All changes committed in 4 separate commits as requested.

Acceptance Criteria ✅

  • POST /api/agents/[id]/skills registers a skill and persists to disk
  • GET /api/skills?q=payment returns matching skills across all agents
  • Invoking a skill without payment returns x402 challenge (402)
  • Successful payment triggers the agent's endpoint call
  • Agent's x402 revenue updated after paid invocation
  • Unit test: register skill → search → found
  • Unit test: invoke without payment → 402
  • All changes aligned with acceptance criteria
  • Committed in at least 3 separate commits (4 commits made)

Example Usage

Agent Registers Skill

curl -X POST http://localhost:3000/api/agents/agent-001/skills \
  -H "Content-Type: application/json" \
  -d '{
    "skillId": "code-review",
    "name": "AI Code Review",
    "description": "Comprehensive code review with best practices",
    "priceXlm": 10,
    "endpoint": "https://agent-001.example.com/code-review"
  }'

Consumer Searches Skills

curl "http://localhost:3000/api/skills?q=code&maxPrice=15"

Consumer Invokes Skill (with Payment)

# Step 1: Get payment challenge
curl "http://localhost:3000/api/agents/agent-001/skills/code-review/invoke?payer=GXXX"

# Step 2: Make payment (using Stellar SDK)

# Step 3: Submit proof and invoke
curl -X POST http://localhost:3000/api/agents/agent-001/skills/code-review/invoke \
  -H "Content-Type: application/json" \
  -d '{
    "paymentRef": "skill:agent-001:code-review:stellar:1234567890",
    "txHash": "0xabc...",
    "chain": "stellar",
    "paidBy": "GXXX...",
    "payload": {
      "code": "function example() { ... }",
      "language": "javascript"
    }
  }'

Integration with Existing Systems

  • x402 Protocol: Reuses existing quote/settlement infrastructure
  • Agent Registry: Compatible with existing agent capabilities system
  • Event System: Skill invocations publish system events via publishSystemEvent()
  • XP System: Uses awardXP() for payment received events
  • API Logging: All routes use createApiRouteLogger() for consistent logging

Technical Decisions

  1. File-based Storage: Simple, reliable, no database dependency
  2. One File Per Agent: Easy to manage, prevents conflicts
  3. x402 Integration: Leverages proven payment infrastructure
  4. Price in XLM: Aligns with existing x402 pricing model
  5. Direct Endpoint Calls: Gives agents full control over skill execution
  6. Payment Headers: Provides context without modifying payload

Next Steps (Future Enhancements)

  • Add skill update/delete endpoints
  • Implement skill categories/tags
  • Add skill rating system
  • Support batch skill invocation
  • Add skill usage analytics
  • Implement skill subscriptions (monthly access)
  • Add skill versioning

Testing Instructions

# Run all tests
npm test

# Run skills tests only
npm test -- skills

# Run with coverage
npm test:coverage

Documentation

  • API Reference: docs/features/skills-marketplace.md
  • Demo Example: examples/skills-marketplace-demo.ts
  • Implementation Checklist: .implementation-checklist.md
  • This Summary: SKILLS_MARKETPLACE_SUMMARY.md

Status: ✅ Complete - All acceptance criteria met Branch: feat/agents-skills-marketplace-x402 Commits: 4 commits (3 implementation + 1 documentation) Lines of Code: ~1,500 (including tests and docs)