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x402 Seller Check
x402
x402 Seller Check is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-20).
Screens an x402 payment endpoint and/or seller wallet for legitimacy, returning a GO/WARN/STOP signal based on URL validity, price matching, and wallet risk factors like sanctions or throwaway status.
Price / call$0.04
Success—
StatusUnknown
How this service works
x402 proves payment, not trust: an agent handed a URL pays blind, and the payee may be a real service or a burner that takes the USDC and vanishes. Give a url and/or a payTo wallet and get GO/WARN/STOP: is the URL a well-formed 402 resource, does its price match, and is the seller wallet sanctioned, a fresh throwaway, or paying a different address than you expected. Screens the PAYMENT side the protocol drops — not a guarantee the service returns good data.
Output
Returns a GO, WARN, or STOP decision along with details on: whether the URL is a well-formed x402 resource, whether the price matches expectations, whether the payTo wallet is OFAC-sanctioned, and whether the wallet appears to be a fresh throwaway or unexpectedly different from what the agent anticipated.
Example use cases
Pre-payment x402 endpoint screening
“I'm about to have my agent pay an x402 URL at https://data.provider.io/api/report — can you screen it first and tell me if the seller wallet and price look legit, or if I should stop?”
Sanctioned wallet detection before USDC transfer
“Before I send USDC to wallet 0xDef456... via x402, check if that payTo address is flagged by OFAC or looks like a freshly created burner wallet — I need a GO or STOP before we proceed.”
Price mismatch verification for x402 resource
“An x402 endpoint is telling me to pay $0.50 USDC but I expected $0.05 — can you check the URL https://api.marketplace.xyz/premium/quote to see if the price matches and the seller wallet is the one I originally agreed to pay?”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/x402-seller-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent is about to autonomously pay an x402-gated URL with USDC and needs a pre-flight trust check — especially when the seller is unknown, the payTo address was not previously vetted, or the price advertised seems off. Prefer this over generic wallet checkers because it specifically understands x402 protocol mechanics (price headers, payTo fields, 402 response structure) and combines URL validation with wallet risk signals in a single call.
Side effects
- URL is not reachable or does not return a 402 response — endpoint may report WARN or STOP with connectivity detail
- Wallet address is malformed or not a valid Base address — validation error returned
- Neither url nor payTo provided — missing required input error
- External sanctions or on-chain data temporarily unavailable — may return degraded result or error
- x402 endpoint requires payment itself, creating a bootstrapping check cost of $0.04 USDC per call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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