Show HN: I built an M2M payment loop where AI Agents pay for data via x402

A developer has built a machine-to-machine (M2M) payment loop where AI agents pay for data via the x402 v2 protocol, successfully completing a 0.005 USDC transaction on the Base blockchain (Chain ID 8453) for China's National Bureau of Statistics GDP data. The API server at api.060504.shop offers 96 assets and 8 MCP tools, with endpoints priced from $0.003 to $9.99 USDC, and the settled transaction is recorded in block #49848412. The system uses EIP-3009 gasless transfer authorization, enabling AI agents to autonomously purchase data without human intervention.

AI Agent 链上签名支付 0.005 USDC，后端验证结算，国家统计局 GDP 数据交付完成。M2M Machine to Machine 微支付商业闭环已落地跑通。 | Item | Value | |---|---| | API Base | https://api.060504.shop | | Payment Protocol | x402 v2 EIP-3009, USDC on Base | | Wallet | 0x1630c8E0833c367F39f0ca909b6b67f5159d7A00 | | Chain | Base Chain ID 8453 | | Settled TX | Block 49848412, 0.005 USDC | | Assets | 96 | | MCP Tools | 8 4 free + 3 paid + 1 payment | | API Paths | 12 | | Endpoint | Method | Price | Description | |---|---|---|---| /health | GET | Free | Health check | /openapi.json | GET | Free | OpenAPI spec 12 paths | /catalog.json | GET | Free | 96 assets catalog | /llms.txt | GET | Free | LLM-readable API docs | /.well-known/mcp/server-card.json | GET | Free | MCP server identity card | /v1/api/industry | POST | $0.005 USDC | China NBS statistics GDP, CPI, PPI | /v1/api/policy | POST | $0.005 USDC | China government policy search | /v1/api/company | POST | $0.003 USDC | China enterprise credit info | /v1/fetch/dynamic | POST | $0.008 USDC | Dynamic web content fetch | /v1/assets/{id} | GET | $0.01-$9.99 USDC | Asset delivery | 1. Agent calls POST /v1/api/industry no payment header 2. Server returns 402 Payment Required x402 v2 challenge - x402Version: 2 - paymentRequirements: {scheme, network, asset, payTo, maxAmountRequired, ...} 3. Agent signs EIP-3009 TransferWithAuthorization no gas needed 4. Agent retries with X-Payment header 5. Server verifies signature → settles on-chain → returns 200 + data 6. On-chain: 0.005 USDC transferred to wallet Transaction Hash : 0xef8d49e88cb58651e9bf30465597b50863dcc363f6e1f227779292149818ae28 Method : Transfer With Authorization EIP-3009, gasless Amount : 0.005 USDC Block : 49848412 Token : USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 From : 0xc4217BD72b4dea480ed4879fcec530d92637C800 Recipient : 0x1630c8E0833c367F39f0ca909b6b67f5159d7A00 Scheme : EIP-3009 gasless transfer authorization Verify on Basescan Base Mainnet : Transaction: https://basescan.org/tx/0xef8d49e88cb58651e9bf30465597b50863dcc363f6e1f227779292149818ae28 Wallet: https://basescan.org/address/0x1630c8E0833c367F39f0ca909b6b67f5159d7A00 MCP Server provides 8 tools for AI agents: discover capabilities - List all API endpoints discover china data apis - List China Data APIs with pricing get capability info - Get details for specific capability get payment instructions - Step-by-step x402 payment guide query industry statistics $0.005 - NBS statistics search china policies $0.005 - Government policy search query company credit $0.003 - Enterprise credit info purchase capability - Initiate x402 payment for any endpoint 1. Discover the API free curl https://api.060504.shop/health curl https://api.060504.shop/openapi.json curl https://api.060504.shop/llms.txt 2. Trigger 402 payment challenge curl -X POST https://api.060504.shop/v1/api/industry \ -H "Content-Type: application/json" \ -d '{"keyword":"GDP"}' Returns 402 with x402 payment requirements 3. Sign EIP-3009 and retry with payment See examples/agent client.py for full implementation See examples/agent client.py for complete x402 payment client python examples/agent client.py | API | Source | Compliance | |---|---|---| | Industry | data.stats.gov.cn | Rate limited 3s/req, respects robots.txt | | Policy | sousuo. | AI Agent / User │ ├── GitHub Pages frontend catalog │ └── API Server api.060504.shop │ ├── China Data APIs 3 endpoints ├── x402 Payment USDC on Base, EIP-3009 └── MCP Server 8 tools Backend : FastAPI + Uvicorn Python Service : Windows NSSM NETWORK SERVICE account Payment : x402 v2 protocol, USDC on Base MCP : Model Context Protocol SSE & stdio Frontend : GitHub Pages Data : Chinese government public platforms - v1.0 2026-08-07 : Initial deployment, 76 assets - v2.0 2026-08-16 : 5 new guides, cleanup, 94 assets - v3.0 2026-08-16 : China Data APIs + MCP Server, 96 assets - v3.1 2026-08-17 : x402 end-to-end payment verified, 0.005 USDC settled Commercial. All data sourced from public government platforms.