---
title: "Deep Fact-Check — $0.075"
method: POST
path: "/v2/x402/ai/fact-check/deep"
tags: ["ai"]
---

# Deep Fact-Check — $0.075

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

## Request

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

Deep fact-check with claim decomposition. Breaks compound claims into max 5 sub-claims, verifies each. Deterministic overall verdict.

## Request body

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

## Response `200`

Deep fact-check result

- object
  - `overall_verdict` 'supported' | 'contradicted' | 'unverifiable' | 'partially_supported', required
  - `claims` object[], required
  - `claims_checked` integer

## 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)