{"uid":"cap_sOghfV-m7o2DjV25ZQ25Z","slug":"api-the402-ai-fd74e4b3","name":"the402.ai Thread Message Sender","description":"Send thread message (free with API key)","url":"https://api.the402.ai/v1/threads/thread_5e9fe506b6c04fe6/messages","method":"POST","headers":{},"bodySchema":{"type":"object","required":["id"],"properties":{"id":{"type":"string"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","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_KUSYjFkPr9q2cpzKTfm4q","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Sends a message to a specific thread on the402.ai platform via the x402 payment protocol","exampleAgentPrompt":"Send a message to my thread on the402 saying 'Please summarize the latest quarterly report' — use thread ID thread_5e9fe506b6c04fe6.","exampleUseCases":null,"resultDescription":"Returns a confirmation that the message was posted to the specified thread, including the message ID, thread ID, and timestamp of delivery.","failureModes":["Invalid or missing API key returns 401 unauthorized","Thread ID not found or inaccessible returns 404","Malformed message body returns 400 bad request","Payment failure via x402 protocol returns 402","Rate limiting or quota exceeded returns 429","Network timeout if the platform is under load"],"whenToPreferThis":"Use this endpoint when you need to post a message to an existing thread on the402.ai platform and have a valid thread ID. It is free with an API key (despite the $0.001 USDC x402 price tag, it is marked free with key), making it suitable for conversational AI workflows, automated messaging pipelines, and agent-to-thread communication on the402 infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:25:47.081Z","isFirstParty":false}