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the402.ai Participant Registration
x402
the402.ai Participant Registration is a paid API for AI agents from api.the402.ai, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Registers a new participant account on the the402.ai AI agent service marketplace platform
Price / call$0.01
Success—
StatusDown
How this service works
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.
Output
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.
Example use cases
Onboard agent to the402 marketplace
“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.”
Register for agent service purchasing
“Set up my account on the402 agent marketplace so I can start buying custom MCP tools and cost forensics services for my workflow.”
Join the402 as new participant
“Get me registered on the402.ai platform so I can begin using their domain availability checks and other AI agent services right away.”
Technical details
Endpoint
POSThttps://api.the402.ai/v1/registerWhen to prefer
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.
Side effects
- 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
Input
{
"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"
}Output
{
"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"
}Schema · Response
| Field | Type | Description |
|---|---|---|
| wallet | string | |
| api_key | string | |
| referral_code | string | |
| participant_id | string | |
| webhook_secret | string |
Tags
x402
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