Api Endpoint

x402.asterpay.io

Source-bounded fact-check. Verify a claim against provided source text. Returns verdict: supported, contradicted, or unverifiable. Does NOT search the web.

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Offering

Provider: x402.asterpay.io
Method: POST
Offering type: Api Endpoint
Transport type: http
Category: Data
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://x402.asterpay.io/v2/x402/ai/fact-check
MIME type: Not provided
First seen: 2026-10-16T01:50:06.715Z
Last seen: 2026-11-01T14:57:12.185Z
Tags: None supplied

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.015 USDC
Atomic price: 15000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2: 0.015 USDC
Atomic price: 15000 · Network: eip155:137 · Asset: USDC · Scheme: exact
Payment option 3: 0.015 USDC
Atomic price: 15000 · Network: eip155:42161 · Asset: USDC · Scheme: exact
Payment option 4: 0.015 USDC
Atomic price: 15000 · Network: eip155:10 · Asset: USDC · Scheme: exact
Payment option 5: 15000 atomic units
Atomic price: 15000 · Network: eip155:1 · Asset: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 · Scheme: exact
Payment option 6: 0.015 USDC
Atomic price: 15000 · Network: eip155:1187947933 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "15000",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E"
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "15000",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E"
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "15000",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E"
  },
  {
    "scheme": "exact",
    "network": "eip155:10",
    "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
    "amount": "15000",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E"
  },
  {
    "scheme": "exact",
    "network": "eip155:1",
    "asset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "amount": "15000",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E"
  },
  {
    "scheme": "exact",
    "network": "eip155:1187947933",
    "asset": "0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20",
    "amount": "15000",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E"
  }
]

Observed health

Status: Reachable
Latest latency: 177 ms
Average latency: 892 ms
HTTP status: 400
Last checked: 2026-11-02T14:45:34.168Z
Reachability: 100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "properties": {
        "claim": {
          "type": "string"
        },
        "source": {
          "type": "string"
        }
      },
      "required": [
        "claim",
        "source"
      ],
      "type": "object"
    },
    "bodyType": {
      "enum": [
        "json",
        "form-data",
        "text"
      ],
      "type": "string"
    },
    "headers": {
      "additionalProperties": {
        "type": "string"
      },
      "type": "object"
    },
    "method": {
      "enum": [
        "POST",
        "PUT",
        "PATCH"
      ],
      "type": "string"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "type": "object"
}

Output schema

{
  "type": "json",
  "schema": {
    "type": "object",
    "required": [
      "verdict",
      "confidence",
      "evidence",
      "summary"
    ],
    "properties": {
      "summary": {
        "type": "string"
      },
      "verdict": {
        "enum": [
          "supported",
          "contradicted",
          "unverifiable"
        ],
        "type": "string"
      },
      "evidence": {
        "type": "string"
      },
      "confidence": {
        "type": "number",
        "maximum": 1,
        "minimum": 0
      }
    }
  },
  "example": {
    "model": "llama-3.3-70b-versatile",
    "summary": "Revenue figure directly contradicted by source.",
    "verdict": "contradicted",
    "evidence": "Source states $119.6B, not $94.9B as claimed.",
    "confidence": 0.98,
    "latency_ms": 820,
    "claims_checked": 1
  }
}