TruthPal Claim Verification

Name: TruthPal Claim Verification
Price: 0.02 USD

x402

TruthPal Claim Verification is a paid API for AI agents from api.thetruthpal.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).

Evaluates a factual claim against a provided source URL and returns a structured verdict with confidence score, reasoning, and supporting/contradicting evidence

Price / call$0.02

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StatusUnknown

How this service works

TruthPal: source-grounded claim verification for AI agents. Supported, contradicted or uncertain verdicts with exact source evidence. $0.02 USDC per request via x402 on Base.

Output

A JSON object containing: a verdict string (e.g. 'true', 'false', 'uncertain'), a natural-language reasoning explanation, a confidence score between 0 and 1, a source_freshness indicator, an array of supporting_evidence quotes from the source, and an array of contradicting_evidence quotes from the source

Example use cases

AI output grounding check

“I just got this answer from an AI: 'The global average temperature has risen by 1.1 degrees Celsius since pre-industrial times.' Can you verify that claim against this IPCC report page — https://www.ipcc.ch/report/ar6/wg1/chapter/summary-for-policymakers/ — and tell me how confident you are that the source backs it up?”

News article claim verification

“A news article says 'Inflation in the US hit 9.1% in June 2022, the highest in 40 years.' Can you check that claim against https://www.bls.gov/cpi/ and give me a verdict with the supporting evidence from the page?”

Research citation validation

“I need to cite a study in my report — I'm claiming 'regular exercise reduces the risk of heart disease by 35%'. Can you verify that against https://www.heart.org/en/healthy-living/fitness/fitness-basics/why-is-physical-activity-so-important and tell me if the source actually says that?”

Technical details

Endpoint

POSThttps://api.thetruthpal.com/v1/verify?utm_source=zero.xyz

When to prefer

Choose TruthPal when you need a structured, evidence-backed verdict on a specific factual claim tied to a particular source URL — especially when validating AI-generated content, citations, or news claims. Prefer this over generic search or web-scraping when you need not just a yes/no but also a confidence score, extracted supporting quotes, and explicit reasoning. Best when both a claim and a verifiable public source are already known.

Side effects

Source URL is inaccessible, behind a paywall, or returns a non-200 response — verdict cannot be generated
Claim is too vague or ambiguous for the system to evaluate against the source
Source content is not in a machine-readable format (e.g. PDF, behind JavaScript rendering)
Claim is entirely outside the scope of the source content, resulting in an 'uncertain' verdict with low confidence
Malformed input — missing claim or source_url fields returns a validation error

Input

Schema · Request body

Field	Type	Description
claim	string	The factual claim to evaluate. Leading and trailing whitespace is trimmed before validation.
source_url	string	The credential-free public HTTP or HTTPS source containing the evidence to evaluate.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "verdict": "supported",
    "evidence": [
      "The source states that the Moon formed about 4.5 billion years ago."
    ],
    "reasoning": "The source directly supports the claim that the Moon formed several billion years ago.",
    "confidence": 0.94,
    "source_freshness": "current",
    "supporting_evidence": [
      "The source states that the Moon formed about 4.5 billion years ago."
    ],
    "contradicting_evidence": []
  }
}

Reviews

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How this service works

TruthPal: source-grounded claim verification for AI agents. Supported, contradicted or uncertain verdicts with exact source evidence. $0.02 USDC per request via x402 on Base.

Output

Example use cases

AI output grounding check

News article claim verification

Research citation validation

Technical details

Endpoint

POSThttps://api.thetruthpal.com/v1/verify?utm_source=zero.xyz

When to prefer

Side effects

Source URL is inaccessible, behind a paywall, or returns a non-200 response — verdict cannot be generated
Claim is too vague or ambiguous for the system to evaluate against the source
Source content is not in a machine-readable format (e.g. PDF, behind JavaScript rendering)
Claim is entirely outside the scope of the source content, resulting in an 'uncertain' verdict with low confidence
Malformed input — missing claim or source_url fields returns a validation error

Input

Schema · Request body

Field	Type	Description
claim	string	The factual claim to evaluate. Leading and trailing whitespace is trimmed before validation.
source_url	string	The credential-free public HTTP or HTTPS source containing the evidence to evaluate.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "verdict": "supported",
    "evidence": [
      "The source states that the Moon formed about 4.5 billion years ago."
    ],
    "reasoning": "The source directly supports the claim that the Moon formed several billion years ago.",
    "confidence": 0.94,
    "source_freshness": "current",
    "supporting_evidence": [
      "The source states that the Moon formed about 4.5 billion years ago."
    ],
    "contradicting_evidence": []
  }
}