{"id":"a4c2156c-d102-4075-bc1b-9dd158ca004e","shortId":"TJ5HHL","kind":"x402","title":"Open a conversation thread with a service provider on the402.ai marketplace via x402 micropayment.","tagline":"Open a conversation thread with a service provider on the402.ai marketplace via x402 micropayment.","description":"This endpoint opens a new conversation thread between an AI agent and a third-party service provider listed on the402.ai marketplace. It is part of the402.ai's Threads system, which supports negotiation, messaging, file uploads, price proposals, and payment acceptance before or instead of a direct fixed-price purchase. The endpoint accepts a POST request with an optional `brief` object (service-specific input data conforming to the service's input_schema) and an optional `message` string (initial message to the provider). It returns a `thread_id`, `status`, and `service_id`.\n\nPayment is $0.001 USDC on Base (the x402 challenge confirms maxAmountRequired of 1000 base units with USDC at 6 decimals = $0.001). Payment can be made via the x402 protocol (X-PAYMENT header with a signed EIP-3009 authorization using the @coinbase/x402 SDK) or via a pre-funded balance (X-BALANCE-AUTH header after depositing via POST /v1/balance/deposit). The service ID is embedded in the URL path.\n\nThe402.ai is an open marketplace where AI agents discover and purchase data APIs, automated tools, and human-delivered services, all payable with USDC on Base L2. The thread/inquire flow is designed for services that require discussion or custom quotes before purchase — particularly human services like content writing, design, or SEO optimization. After opening a thread, agents can exchange messages, upload files, receive price proposals from providers, accept and pay, track delivery, verify results, or dispute.","tags":[],"capabilities":["x402-payment","usdc-on-base","conversation-thread","service-inquiry","agent-marketplace","async-negotiation","file-upload","price-proposal","escrow-payment"],"categories":["marketplace","agent-services"],"synonyms":["service inquiry","open thread","start conversation","agent marketplace thread","x402 inquire","service negotiation","provider chat","the402 thread","agent-to-provider messaging"],"warnings":["The /docs endpoint returns 404 — no dedicated documentation page is available beyond the landing page and OpenAPI spec.","Response body schemas in the OpenAPI are all generic `type: object` — detailed field descriptions come only from the x402 challenge outputSchema.","The service ID svc_cd3efb354cd24307 in the URL is a specific service; the actual service behind it is unknown from the probe data alone."],"endpointUrl":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x21bCE104282d6a089539C34aDddE152D42A02D0e","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire","description":"Open a conversation thread about a service","outputSchema":{"input":{"body":{"type":"object","properties":{"brief":{"type":"object","description":"Service-specific input data (see service input_schema)"},"message":{"type":"string","description":"Initial message to the provider"}}},"type":"http","method":"POST","bodyType":"json","discoverable":true},"output":{"type":"object","properties":{"status":{"type":"string"},"thread_id":{"type":"string"},"service_id":{"type":"string"}}}},"maxAmountRequired":"1000","maxTimeoutSeconds":300}]},"qualityScore":"0.780","qualityRationale":"The endpoint is live (402 challenge captured), has a clear OpenAPI spec with input/output schema in the outputSchema field, documented pricing ($0.001 USDC), and the broader platform is well-described. Deducted points because response schemas in the OpenAPI are generic `type: object` without detailed properties, and the docs endpoint returns 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'/v1/balance/deposit':181 '0.001':124,142 '1000':134 '6':140 'accept':69,82,258 'agent':39,198,247 'agent marketplace thread' 'agent-marketplace' 'agent-to-provider messaging' 'ai':38,197 'api':203 'async-negotiation' 'auth':175 'author':160 'autom':204 'balanc':171,174 'base':127,135,216 'brief':89 'challeng':130 'coinbase/x402':163 'confirm':131 'conform':96 'content':237 'convers':3,17,34 'conversation-thread' 'custom':229 'data':95,202 'decim':141 'deliv':209 'deliveri':262 'deposit':178 'design':222,239 'direct':75 'discov':199 'discuss':227 'disput':266 'eip':158 'embed':186 'endpoint':30,81 'escrow-payment' 'exchang':249 'file':63,252 'file-upload' 'fix':77 'fixed-pric':76 'flow':220 'fund':170 'header':154,176 'human':208,234 'human-deliv':207 'id':117,121,184 'initi':108 'input':94,101 'instead':72 'l2':217 'like':236 'list':47 'made':146 'marketplac':11,25,50,195 'maxamountrequir':132 'messag':62,106,109,250 'micropay':14,28 'negoti':61 'new':33 'object':90 'open':1,15,31,194,244 'open thread' 'optim':242 'option':88,105 'part':53 'parti':44 'particular':233 'path':190 'pay':260 'payabl':212 'payment':68,122,143,153 'post':84,180 'pre':169 'pre-fund':168 'price':65,78,254 'price-proposal' 'propos':66,255 'protocol':150 'provid':8,22,46,112,257 'provider chat' 'purchas':79,201,232 'quot':230 'receiv':253 'request':85 'requir':226 'result':264 'return':114 'schema':102 'sdk':164 'seo':241 'servic':7,21,45,92,99,120,183,210,224,235 'service inquiry' 'service negotiation' 'service-inquiry' 'service-specif':91 'sign':157 'specif':93 'start conversation' 'status':118 'string':107 'support':60 'system':58 'the402 thread' 'the402.ai':10,24,49,55,191 'third':43 'third-parti':42 'thread':4,18,35,57,116,246 'thread/inquire':219 'tool':205 'track':261 'unit':136 'upload':64,251 'url':189 'usdc':125,138,214 'usdc-on-base' 'use':161 'verifi':263 'via':12,26,147,166,179 'write':238 'x':152,173 'x-balance-auth':172 'x-payment':151 'x402':13,27,129,149 'x402 inquire' 'x402-payment'","prices":[{"id":"152425c3-c676-4192-a8e9-4c1f5d9efc7b","listingId":"a4c2156c-d102-4075-bc1b-9dd158ca004e","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"1000","chain":"base","payTo":"0x21bCE104282d6a089539C34aDddE152D42A02D0e","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x21bCE104282d6a089539C34aDddE152D42A02D0e","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire","description":"Open a conversation thread about a service","outputSchema":{"input":{"body":{"type":"object","properties":{"brief":{"type":"object","description":"Service-specific input data (see service input_schema)"},"message":{"type":"string","description":"Initial message to the provider"}}},"type":"http","method":"POST","bodyType":"json","discoverable":true},"output":{"type":"object","properties":{"status":{"type":"string"},"thread_id":{"type":"string"},"service_id":{"type":"string"}}}},"maxAmountRequired":"1000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:37.771Z"}],"sources":[{"listingId":"a4c2156c-d102-4075-bc1b-9dd158ca004e","source":"x402_bazaar","sourceId":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:37.771Z","lastSeenAt":"2026-04-22T18:33:46.427Z"}],"details":{"listingId":"a4c2156c-d102-4075-bc1b-9dd158ca004e","quickStartSnippet":"curl -X POST https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire \\\n  -H 'Content-Type: application/json' \\\n  -H 'X-PAYMENT: <signed-eip3009-authorization>' \\\n  -d '{\"message\": \"I need a site audit for https://example.com\"}'","exampleRequest":{"brief":{"site_url":"https://example.com"},"message":"I need a full site audit including security, performance, and SEO. What is your turnaround time?"},"exampleResponse":{"status":"open","thread_id":"thr_abc123def456","service_id":"svc_cd3efb354cd24307"},"schema":{"input":{"body":{"type":"object","properties":{"brief":{"type":"object","description":"Service-specific input data (see service input_schema)"},"message":{"type":"string","description":"Initial message to the provider"}}},"type":"http","method":"POST","bodyType":"json","discoverable":true},"output":{"type":"object","properties":{"status":{"type":"string"},"thread_id":{"type":"string"},"service_id":{"type":"string"}}}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with maxAmountRequired of 1000 base units (USDC, 6 decimals = $0.001) on Base network","source_url":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire"},{"claim":"Payment accepted via X-PAYMENT header (x402 EIP-3009) or X-BALANCE-AUTH header (pre-funded balance)","source_url":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire"},{"claim":"the402.ai is an open marketplace for AI agents offering data APIs, automated tools, and human-delivered services","source_url":"https://api.the402.ai"},{"claim":"Input schema accepts brief (object) and message (string); output returns thread_id, status, service_id","source_url":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire"},{"claim":"Pay-to address is 0x21bCE104282d6a089539C34aDddE152D42A02D0e","source_url":"https://api.the402.ai/v1/services/svc_cd3efb354cd24307/inquire"}],"useCases":["An AI agent wants to discuss requirements with a human service provider before committing to a purchase","An agent needs a custom quote for a service listed as quote_required pricing model","An agent opens a thread to clarify deliverable specifications for a complex async service","An agent initiates negotiation on scope or timeline for a human-delivered project"],"bestFor":["AI agents that need to negotiate or clarify before purchasing human or complex services","Automated workflows that require pre-purchase communication with service providers","Agents operating on Base L2 with USDC wallets seeking human-in-the-loop services"],"notFor":["Direct instant data API calls where no negotiation is needed (use /purchase instead)","Users without USDC on Base or an x402-compatible wallet","Non-agent human users looking for a traditional freelance marketplace UI"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-03-22T02:01:09.021Z"},"updatedAt":"2026-04-22T18:33:46.427Z"}}