{"uid":"cap_pxcxI8kBxF9M70fGPi4hI","slug":"api-the402-ai-54a047a1","name":"the402.ai Thread Message Sender","description":"Send thread message (free with API key)","url":"https://api.the402.ai/v1/threads/thread_9b0adb82375a470b/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_zdZrcuyxfUrt0NN2agudL","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 using an API key, charged per call via x402 micropayment","exampleAgentPrompt":"Send the message 'Your report is ready for review' to thread ID thread_9b0adb82375a470b on the402 platform.","exampleUseCases":null,"resultDescription":"A confirmation that the message was posted to the specified thread, likely returning the created message object or a success status along with the message record in the thread.","failureModes":["Invalid or missing thread ID returns an error","Missing API key or unauthorized access returns 401/403","Thread not found returns 404","Insufficient USDC balance or payment failure blocks the request","Malformed request body with missing required 'id' field returns 400"],"whenToPreferThis":"Use this endpoint when you need to programmatically post messages to a specific thread on the402.ai platform, especially in automated workflows where micropayment-per-message billing via x402 is acceptable and you have a valid API key.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T15:27:57.818Z","isFirstParty":false}