# the402.ai Participant Registration

> 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

## Facts

- Endpoint: POST https://api.the402.ai/v1/register
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-the402-ai-b7dceb8a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tFh5euIKwNnXlfcrjhEnI

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability api-the402-ai-b7dceb8a -d '<json body>'
```

Example prompt: 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.

## When to prefer this

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.

## Known failure modes

- 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

## 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 request

```json
{
 "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 schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "wallet": {
   "type": "string"
  },
  "api_key": {
   "type": "string"
  },
  "referral_code": {
   "type": "string"
  },
  "participant_id": {
   "type": "string"
  },
  "webhook_secret": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-the402-ai-b7dceb8a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.the402.ai](https://www.zero.xyz/host/api.the402.ai/llms.txt)