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

> Source: <https://github.com/tianzizhiming-svg/agentbridge>
> Published: 2026-08-18 07:07:00+00:00

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.