# x402 Trust & Discovery API — Seller Lookup by Wallet

> x402 Trust & Discovery API — Seller Lookup by Wallet is a paid API for AI agents from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us, paid per call via x402, $0.03/call, status down (last checked 2026-10-02).

Returns reputation and onchain settlement data for a seller wallet address (payTo) on Base, helping agents assess whether an x402 endpoint's payee is trustworthy before sending payment.

## Facts

- Endpoint: GET https://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/seller?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: down
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-trust-discovery-api-seller-lookup-by-wallet-ffef539b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lcjcuzNef3TNApzPedJie

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 x402-trust-discovery-api-seller-lookup-by-wallet-ffef539b
```

Example prompt: Before my agent pays that x402 endpoint, can you look up the seller wallet 0x1234abcd... and tell me if they have a real onchain settlement history on Base and whether they're safe to pay?

## When to prefer this

Use this endpoint when you have a payTo wallet address from an x402 endpoint and need to assess the seller's legitimacy before spending USDC. This is the right choice when you want onchain-backed seller reputation rather than just endpoint-level safety checks, or when you want to vet a new seller wallet before adding it to an agent's auto-pay whitelist.

## Known failure modes

- Invalid or malformed 0x wallet address returns an error
- Wallet has no onchain history — returns empty or minimal data, not an error
- Service unavailable due to Base RPC issues
- Rate limit exceeded for repeated lookups
- Wallet exists but has zero x402 settlement events — ambiguous legitimacy signal

## How this service works

Independent pre-purchase safety and reputation checks for x402 and MPP endpoints, plus keyless onchain data on Base. Accepts BOTH EIP-3009 and Circle Gateway credentials — only 141 of 788 Base-payable resources do, and a single-credential buyer is locked out of 53.8% of this market on one rail or 28.3% on the other. GET /v1/guard?url=&credential= answers whether the credential you carry can pay a given endpoint at all, before you try. Searching this market for "is this API endpoint a scam" returns registries and explorers but no dedicated service; that gap is what /v1/guard fills, inspecting an endpoint WITHOUT paying it and returning a go / test-with-minimum / do-not-pay verdict backed by onchain settlement history.

## Output

Returns a JSON object containing onchain data about the seller wallet on Base, including settlement history, payment counts, and any available reputation signals — helping the caller assess whether the payTo address is a known, active, and trustworthy x402 recipient before making a payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "payTo": {
   "type": "string",
   "description": "Seller payTo wallet address (0x-prefixed)."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-trust-discovery-api-seller-lookup-by-wallet-ffef539b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us](https://www.zero.xyz/host/gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/llms.txt)