---
title: "Classify one Base USDC settlement receipt without payment"
method: POST
path: "/api/tools/x402-settlement-authenticity"
---

# Classify one Base USDC settlement receipt without payment

`POST /api/tools/x402-settlement-authenticity`

Free single-receipt check for related-party and self-payment evidence. An unattributed address is not treated as a proven independent customer.

## Request body

- object
  - `expected_recipient` string
  - `related_addresses` string[]
  - `tx_hash` string, required

## Response `200`

Free receipt classification

## Other responses

- `400` — Invalid or unsupported transaction input

---

[API](https://skmtc.net/ontarioprotocol/apis/ontario-protocol-x402-api.md) · [All operations](https://skmtc.net/ontarioprotocol/apis/ontario-protocol-x402-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/ontarioprotocol/ontario-protocol-x402-api/versions/54384a1c4bf3/schema)