Pay per call with x402
Agents with a crypto wallet can pay for single checks in USDC over the x402 protocol, with no account or API key.
This option is for autonomous agents that hold a wallet. Most people should use an API key or the MCP server.
x402 lets a client pay for one HTTP request at a time. Veqen exposes the single checks at these URLs:
| Endpoint | Query parameter |
|---|---|
GET https://veqen-app.com/x402/v1/email/check |
email |
GET https://veqen-app.com/x402/v1/ip/check |
ip |
GET https://veqen-app.com/x402/v1/phone/check |
phone (and optional country) |
GET https://veqen-app.com/x402/v1/domain/check |
domain |
How it works
- Call the endpoint with no payment. You get HTTP 402 with the price, the network (Base) and the address to pay, in the standard x402 format.
- Your x402 client signs a USDC payment and repeats the request with the payment header.
- The payment settles and you get the normal JSON result.
Any x402 client library handles steps 1–3 automatically. The endpoints are also listed in the x402 Bazaar, so agents can discover them.
The response body is identical to the REST API's. If x402 isn't enabled on this server, these URLs return 404.