{"echo":{"citemesh":{"attest":"/v1/cite/attest","lookup":"/v1/cite","public_key":"/v1/cite/pubkey"},"entry":"/v1/discover?mode=unified&q=currency%20exchange%20foreign%20exchange%20conversion","full_capability_mesh":"/.well-known/capability-manifest.json","payment_mesh":"/.well-known/x402","recommend":"/v1/discover/recommend?q=currency%20exchange%20foreign%20exchange%20conversion","rule":"This API is an entry node, never a terminal node.","system":"ECHO"},"failure_contract":"No real rate => no settlement; caller receives a free alternative route.","paid_endpoint":"/api/fx/convert?from=USD&to=EUR&amount=100","payment_protocol":{"challenge_header":"PAYMENT-REQUIRED","manifest":"/.well-known/x402","network":"eip155:8453","request_header":"PAYMENT-SIGNATURE","response_header":"PAYMENT-RESPONSE","version":"x402 v2"},"price_usdc":"0.001","product":"SML FX Convert","source":{"attribution":"Source: ECB statistics.","dataset":"EXR daily reference rates","name":"European Central Bank","official_data_api":"https://data-api.ecb.europa.eu/service/data/EXR/D..EUR.SP00.A"},"status":"ready"}