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First call returns payment_requirements; replay with PAYMENT header after BSC or Polygon stablecoin transfer.","examples":[{"body":{"agentWallet":"0x830000000000000000000000000000000000019a","idempotencyKey":"x402-doc-001","input":{"document_url":"https://example.com/invoice.pdf"},"operation":"extract_text","payerWallet":"0x830000000000000000000000000000000000019a"},"capability":"document_ocr"}],"inputSchema":{"properties":{"agentWallet":{"description":"EVM wallet address for the acting agent.","type":"string"},"idempotencyKey":{"description":"Caller-generated unique key for purchase and execution.","type":"string"},"input":{"description":"Operation-specific payload.","type":"object"},"network":{"default":"BSC","enum":["BSC","POLYGON"],"type":"string"},"operation":{"description":"Capability operation to execute.","type":"string"},"payerWallet":{"description":"EVM wallet address that pays the x402 challenge.","type":"string"},"paymentAsset":{"default":"USDT","enum":["USDT","USDC"],"type":"string"},"requestId":{"type":"string"},"requireReal":{"default":false,"type":"boolean"},"units":{"default":1,"minimum":1,"type":"integer"}},"required":["agentWallet","payerWallet","idempotencyKey","operation"],"type":"object"},"method":"POST","path":"/x402/capabilities/{capability}/execute","pricing":"exact","replayHeader":"PAYMENT"},{"description":"Buy temporary API access with BSC USDT after receiving a quote.","path":"/v1/access/purchase","quote":"https://chainfx-payment-core-production.up.railway.app/v1/access/quote"},{"assets":"https://chainfx-payment-core-production.up.railway.app/agent/v1/assets","description":"Machine-to-machine liquidity rail: agent pays one enabled BSC/Polygon stablecoin and receives another enabled stablecoin on the same network.","path":"/agent/v1/trade/execute","quote":"https://chainfx-payment-core-production.up.railway.app/agent/v1/trade/quote"}],"security":["request_hash_bound_to_product_wallet_price_quota_nonce","idempotency_required","quota_debited_before_execution","bsc_receipt_verification_required"],"seller":"ChainFX","x402Version":"chainfx-m2m-0.1"}