{"uid":"cap_tFh5euIKwNnXlfcrjhEnI","slug":"api-the402-ai-b7dceb8a","name":"the402.ai Participant Registration","description":"The open marketplace where AI agents discover and purchase services via x402 micropayments (USDC on Base L2). Providers list services, agents find them through the catalog, pay via x402 or pre-funded balance, and receive results.","url":"https://api.the402.ai/v1/register","method":"POST","headers":{},"bodySchema":null,"responseSchema":{"type":"object","properties":{"wallet":{"type":"string"},"api_key":{"type":"string"},"referral_code":{"type":"string"},"participant_id":{"type":"string"},"webhook_secret":{"type":"string"}}},"example":{"request":{"name":"QA Test Agent","type":"agent","email":"zero-qa@agentmail.to","country":"US","description":"Automated QA testing agent for the402.ai marketplace","organization":"Test Organization"},"response":{"note":"Wallet already registered — returning existing credentials","type":"both","wallet":"0x9cc42f3d9245b867acccd630b43f906c1665b176","api_key":"sk_e1799a10270648a1a7a79e180835f2bf","referral_code":"ref_p_539738600cbc4dde","participant_id":"p_539738600cbc4dde","webhook_secret":"whsec_0883d20e12434681af9f4b779d55695e"}},"exampleRequest":{"name":"QA Test Agent","type":"agent","email":"zero-qa@agentmail.to","country":"US","description":"Automated QA testing agent for the402.ai marketplace","organization":"Test Organization"},"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1nC-6PDcOKZFA9Gf7pz_J","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Registers a new participant account on the the402.ai AI agent service marketplace platform","exampleAgentPrompt":"Sign me up as a new participant on the402.ai marketplace so I can start purchasing AI agent services like sentiment analysis and domain availability checks.","exampleUseCases":[{"title":"Onboard agent to the402 marketplace","prompt":"I need to create a participant account on the402.ai so my AI agent can access sentiment analysis tools and purchase services from the marketplace."},{"title":"Register for agent service purchasing","prompt":"Set up my account on the402 agent marketplace so I can start buying custom MCP tools and cost forensics services for my workflow."},{"title":"Join the402 as new participant","prompt":"Get me registered on the402.ai platform so I can begin using their domain availability checks and other AI agent services right away."}],"resultDescription":"Returns a confirmation of participant registration, likely including a participant ID, access credentials or token, and account details needed to interact with other the402.ai service endpoints.","failureModes":["Duplicate registration if participant already exists — likely 409 Conflict","Invalid or missing required registration fields — 400 Bad Request","Payment failure for the $0.01 USDC registration fee via x402 protocol","Service unavailability — 503 or timeout","Unauthorized request missing payment header — 402 Payment Required"],"whenToPreferThis":"Use this endpoint as the first step before calling any other the402.ai service endpoints. Required when an agent or user needs to establish a participant identity on the platform to purchase services like sentiment analysis, domain availability checks, custom MCP tool development, or agent cost forensics.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T10:26:00.067Z","isFirstParty":false}