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X402 Hub Username Check
x402
X402 Hub Username Check is a paid API for AI agents from x402-hub.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-22).
Checks whether a given username is available or already taken, via a micropayment-gated API endpoint
Price / call$0.05
Success—
StatusUnknown
How this service works
63 paid API endpoints protected by x402 micropayments on Base
Output
Returns an object containing data about the username status — typically whether the username is available or already in use, along with any relevant metadata returned by the upstream service.
Example use cases
Pre-registration username check
“Before I sign up, can you check if the username 'starlightdev' is already taken?”
Brand handle availability check
“I'm launching a new brand called 'NeonBrew' — can you check if that username is available so I can grab it?”
Alternative username discovery
“Is 'pixelwolf' available as a username? I want to know before I try to register it.”
Technical details
Endpoint
POSThttps://x402-hub.vercel.app/api/username-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-use username availability check without committing to a full identity platform subscription. It is ideal for agents that occasionally need to validate usernames on demand, paying only $0.05 USDC per check via Base blockchain micropayments. Prefer this over free username checkers when you need reliable, real-time results backed by a structured API with consistent response schemas.
Side effects
- Missing or empty query parameter returns a validation error
- Username not found in the upstream system may return null or empty data
- Upstream API downtime may cause 502 or timeout errors
- Insufficient USDC balance or failed x402 micropayment results in 402 Payment Required
- Malformed query string may return unexpected results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| queryrequired | string | Query parameter for the API |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| data | object | Response data from upstream API |
Tags
x402
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