# x402 Settlement Receipt Verifier

> x402 Settlement Receipt Verifier is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.013/call, status unknown (last checked 2026-10-31).

Retrieves and verifies the settlement receipt for a completed x402 USDC micropayment transaction by transaction hash.

## Facts

- Endpoint: GET https://x402helper.xyz/529639/api/settle/receipt?utm_source=zero.xyz
- Price: $0.013/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-settlement-receipt-verifier-43edfe57
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CRqpjtbOjSMPgAilj-29Z

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-settlement-receipt-verifier-43edfe57
```

Example prompt: Can you pull up the settlement receipt for my x402 micropayment with transaction hash 0xabc123...def456 and show me whether it settled successfully?

## When to prefer this

Use this endpoint when you need to verify or retrieve a receipt for a specific x402 micropayment settlement identified by its transaction hash. It is purpose-built for confirming USDC micropayment completions in x402 agent-to-agent payment flows, particularly useful for auditing, debugging, or confirming billing after a pay-per-call API interaction.

## Known failure modes

- Missing or malformed 'tx' query parameter returns 400 before payment is charged
- Invalid transaction hash format (not 0x + 64 hex characters) returns 400
- Transaction hash not found on-chain or not a valid x402 settle transaction returns an error result
- Payment of 0.013 USDC required before response is served; unpaid requests receive 402

## How this service works

X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.

## Output

A JSON object containing a 'success' boolean and a 'result' object with settlement details for the given transaction hash, including payment status and any associated receipt metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "tx"
     ],
     "properties": {
      "tx": {
       "type": "string",
       "default": null,
       "description": "Settle transaction hash (0x + 64 hex). Required. Missing/invalid → 400 before payment."
      },
      "lang": {
       "type": "string",
       "default": null,
       "description": "Copy language for summary. Optional."
      },
      "resource": {
       "type": "string",
       "default": null,
       "description": "Optional http(s) URL to echo. Informational — not fetched."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {},
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-settlement-receipt-verifier-43edfe57/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)