{"uid":"cap_hasURP-2U2cAWqCft0eTC","slug":"api-the402-ai-d4f53485","name":"the402.ai Thread Message Sender","description":"Send thread message (free with API key)","url":"https://api.the402.ai/v1/threads/thread_8e346c6da4264b13/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_fC2D_KMVmNsnLXw8cvosd","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 a specific AI thread on the402.ai platform, enabling conversational interactions within a persistent thread context","exampleAgentPrompt":"Send the message 'What are the top 3 trends in renewable energy in 2025?' to my the402.ai thread so I can continue the conversation I started earlier.","exampleUseCases":null,"resultDescription":"Returns a confirmation of the posted message, including the message ID, thread ID, timestamp, and message content as stored within the thread on the402.ai platform.","failureModes":["Invalid or missing API key returns 401 Unauthorized","Thread ID not found returns 404 Not Found","Malformed message body returns 400 Bad Request","Insufficient payment or payment failure returns 402 Payment Required","Rate limiting triggers 429 Too Many Requests","Thread has been closed or archived returns 403 Forbidden"],"whenToPreferThis":"Use this endpoint when you need to append a user or system message to an existing persistent thread on the402.ai and want a pay-per-use micropayment model via x402 at $0.001 USDC per call. Prefer this over general messaging APIs when working within the the402.ai ecosystem and already have a valid thread ID.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T08:25:56.198Z","isFirstParty":false}