{"uid":"cap_3Hr2eRgKRxw9IsE71dx_h","slug":"api-the402-ai-0637d1c0","name":"the402.ai Thread Message Sender","description":"Send thread message (free with API key)","url":"https://api.the402.ai/v1/threads/thread_70b5802993ec4e0c/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_3cW-gmbkNRty-oS89UjMB","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":"Posts a new message to an existing conversation thread on the the402 platform","exampleAgentPrompt":"Post a message to my thread on the402 platform (thread ID: thread_70b5802993ec4e0c) saying 'Please review the latest draft and provide feedback by end of day.'","exampleUseCases":null,"resultDescription":"Returns a confirmation that the message was delivered to the specified thread, including the new message object with its ID, timestamp, and content as stored on the the402 platform.","failureModes":["Invalid or missing API key returns authentication error","Thread ID does not exist returns 404 not found","Malformed message body returns 400 bad request","Insufficient payment (x402) returns 402 payment required","Rate limiting may return 429 too many requests"],"whenToPreferThis":"Use this endpoint when you need to programmatically send a message into an existing thread on the the402 platform. Prefer this over alternatives when your workflow involves the402's thread-based messaging system and you already have a thread ID. This is free with an API key (no per-call payment required for authenticated requests).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T07:26:39.168Z","isFirstParty":false}