# x402 Trust & Discovery API — Onchain Transaction Lookup

> x402 Trust & Discovery API — Onchain Transaction Lookup is a paid API for AI agents from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us, paid per call via x402, $0.001/call, status down (last checked 2026-10-01).

Retrieves onchain transaction data from Base by transaction hash, providing keyless settlement history for x402/MPP payment endpoints.

## Facts

- Endpoint: GET https://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/onchain/tx?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-trust-discovery-api-onchain-transaction-lookup-c454548d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mp_lwLaaEdm76QxDOGDr_

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-onchain-transaction-lookup-c454548d
```

Example prompt: Can you look up the Base transaction with hash 0xabc123... and tell me what the onchain settlement record shows?

## When to prefer this

Use this endpoint when you need to verify or audit a specific Base blockchain transaction by its hash without holding wallet credentials. It is particularly useful for confirming x402 or MPP payment settlements, auditing agent spending, or debugging payment flows where you have a tx hash and need onchain ground truth.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Transaction hash not found on Base returns empty or 404 response
- Network latency from Base RPC may cause timeouts
- Transactions still pending may not yet appear in results
- Hash from a different chain (not Base) will return no results

## 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 transaction details from Base for the provided transaction hash, including settlement status, payment amounts, and related metadata relevant to x402/MPP payment verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hash": {
   "type": "string",
   "description": "0x transaction hash on Base."
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-trust-discovery-api-onchain-transaction-lookup-c454548d/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)