---
title: "Fact-Check (x402) — $0.015"
method: POST
path: "/v2/x402/ai/fact-check"
tags: ["ai"]
---

# Fact-Check (x402) — $0.015

`POST /v2/x402/ai/fact-check`

## Request

- Base URL: `https://x402.asterpay.io`
- URL: `https://x402.asterpay.io/v2/x402/ai/fact-check`
- Auth: one of:
  - API key in header `PAYMENT-SIGNATURE`
  - HTTP payment

Source-bounded fact-check via x402 payment. Same as /v1/ai/fact-check.

## Request body

- object
  - `claim` string, required
  - `source` string, required

## Response `200`

Fact-check result

- object
  - `verdict` string, required
  - `confidence` number
  - `evidence` string
  - `summary` string

## Other responses

- `402`: Payment Required — pay via x402 or MPP (USDC on Base, Ethereum, Polygon, Arbitrum, Optimism or SKALE), then retry. See the WWW-Authenticate and Payment-Required response headers, or the `accepts` array below. The example is the exact body the runtime returns (minus per-request extras such as example_response and extensions.bazaar).

---

[API](https://skmtc.dev/asterpay/apis/asterpay-data-api.md) · [All operations](https://skmtc.dev/asterpay/apis/asterpay-data-api/llms.txt) · [OpenAPI document](https://skmtc.dev/asterpay/apis/asterpay-data-api/revisions/97b4ab464b3b?raw)