Index onlineMerchant portal
Api Endpoint

TruthPal

Check whether a supplied public source supports or contradicts a factual claim. Validate citations in AI-generated answers against the supplied URL. TruthPal returns source-grounded evidence and a supported, contradicted, or uncertain verdict; when the source is insufficient, the result is uncertain. It assesses only the supplied source and does not independently corroborate the claim.

Open interactive test console

Offering

Provider
api.thetruthpal.com
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Web Search Research
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://api.thetruthpal.com/v1/verify
MIME type
Not provided
First seen
2026-10-16T01:50:32.458Z
Last seen
Tags
Source verification, Citation checking, Evidence verification, Fact checking, Claim verification

Website

Payment pricing

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

Payment option 1
0.02 USDC
Atomic price: 20000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "20000",
    "payTo": "0xc33D5a8f0372B806167Cd4A52fffb230d52FDcf0"
  }
]

Observed health

Status
Healthy
Latest latency
163 ms
Average latency
168 ms
HTTP status
200
Last checked
Reachability
100% over 3 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": {
          "description": "The factual claim to evaluate. Leading and trailing whitespace is trimmed before validation.",
          "maxLength": 2000,
          "minLength": 5,
          "type": "string"
        },
        "source_url": {
          "description": "The credential-free public HTTP or HTTPS source containing the evidence to evaluate.",
          "format": "uri",
          "maxLength": 2048,
          "pattern": "^[Hh][Tt][Tt][Pp][Ss]?://",
          "type": "string"
        }
      },
      "required": [
        "claim",
        "source_url"
      ],
      "type": "object"
    },
    "bodyType": {
      "enum": [
        "json",
        "form-data",
        "text"
      ],
      "type": "string"
    },
    "method": {
      "enum": [
        "POST"
      ],
      "type": "string"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "type": "object"
}

Output schema

{
  "properties": {
    "example": {
      "properties": {
        "confidence": {
          "maximum": 1,
          "minimum": 0,
          "type": "number"
        },
        "contradicting_evidence": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "evidence": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "reasoning": {
          "type": "string"
        },
        "source_freshness": {
          "enum": [
            "current",
            "dated",
            "unknown"
          ],
          "type": "string"
        },
        "supporting_evidence": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "verdict": {
          "enum": [
            "supported",
            "contradicted",
            "uncertain"
          ],
          "type": "string"
        }
      },
      "required": [
        "verdict",
        "confidence",
        "evidence",
        "supporting_evidence",
        "contradicting_evidence",
        "reasoning",
        "source_freshness"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}