{"payment_protocol":"x402 (HTTP 402 Payment Required)","currency":"USDC","network":"Base Sepolia testnet (eip155:84532)","pricing":{"GET /api/risk-score/{pool_id}":"$0.005","POST /api/rebalance":"$0.01","POST /a2a":"$0.01","POST /a2a/stream":"$0.01"},"free_endpoints":["GET /health","GET /api/pools","GET /api/best-yield","GET /api/pricing","GET /.well-known/agent.json","GET /docs"],"how_it_works":"1. Request any paid endpoint without payment → get 402 with payment details. 2. Sign a USDC payment on Base using the returned parameters. 3. Resend request with X-PAYMENT header → get 200 with data.","wallet":"0x6a1175D0EA0e6817786Ce51F1C4F3294F907f410","contact":"api@chado.studio"}