{"uid":"cap_ZgpRv0URqwU1DXIbVzBBY","slug":"agentfeeds-echo-test-endpoint-8e4a2d8d","name":"AgentFeeds Echo Test Endpoint","description":"x402 payment E2E test endpoint (echoes query). Factual data only; not investment advice.","url":"https://api.agentfeeds.jp/v1/sample/echo","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{"msg":{"type":"string","description":"text to echo (max 200 chars)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"data":{"echo":"hello"},"kind":"factual_data","product":"sample.echo"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cTV6CmftOvvtoCuCW4GZl","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Echoes a query string message back — an x402 payment integration test endpoint for developers validating paid API calls.","exampleAgentPrompt":"Echo the message 'hello x402 test' through the AgentFeeds paid echo endpoint so I can confirm my x402 USDC micropayment integration is working end-to-end.","exampleUseCases":null,"resultDescription":"The endpoint returns the echoed text message that was sent as the 'msg' query parameter, confirming that the x402 payment was processed and the API call succeeded.","failureModes":["Missing 'msg' query param — endpoint may return empty or default response","Payment failure — x402 handshake fails if USDC balance is insufficient (402 Payment Required)","Message exceeds 200 characters — may be rejected or truncated","Network timeout — endpoint unreachable","Invalid x402 payment header — authentication/payment step fails"],"whenToPreferThis":"Use this endpoint when you need to verify that your x402 micropayment integration is correctly set up — it is the simplest possible paid API call (just an echo) and is purpose-built for E2E testing of payment flows. Not useful for production data retrieval.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:54:13.613Z","isFirstParty":false}