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SourceMint Claim Verification
x402
SourceMint Claim Verification is a paid API for AI agents from sourcemint-api.nap6281.chatgpt.site, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Verifies whether a textual claim is consistent with the content of one or more provided source URLs, returning a verdict, confidence score, and cryptographic proof bundle.
Price / call$0.01
Success—
StatusUnknown
How this service works
Wallet-native x402 APIs for web extraction, claim verification, and citation auditing.
Output
Returns a JSON object containing: the original claim, a verdict string (e.g. 'consistent', 'inconsistent', 'unverifiable'), a confidence score between 0 and 1, a list of source entries analyzed, and a proof bundle with a SHA-256 hash for cryptographic auditability.
Example use cases
Fact-checking a news article claim
“I'm reading an article that claims 'Global average temperatures rose by 1.2°C above pre-industrial levels in 2023' — can you check whether that's actually consistent with the evidence at https://climate.nasa.gov/vital-signs/global-temperature/ and https://www.noaa.gov/climate?”
Auditing citations in a research draft
“I've written a report saying 'Electric vehicle sales surpassed 10 million units worldwide in 2022.' Can you verify whether that claim is backed up by what's actually written at https://www.iea.org/reports/global-ev-outlook-2023 and https://www.statista.com/ev-sales-2022?”
Checking a product marketing claim
“Our marketing team wants to say 'Studies show our ingredient reduces inflammation by 40%.' Can you check if that claim holds up against the content at https://pubmed.ncbi.nlm.nih.gov/example-study and https://www.healthline.com/nutrition/anti-inflammatory-diet?”
Technical details
Endpoint
POSThttps://sourcemint-api.nap6281.chatgpt.site/api/verify-claimWhen to prefer
Choose this endpoint when you need to programmatically verify whether a specific textual claim is supported or contradicted by the actual content of one or more web pages, especially when you require a cryptographic proof bundle (SHA-256) for auditability. Prefer it over generic web scraping when the goal is claim-level consistency checking rather than raw content extraction, and when you need a structured verdict with a confidence score rather than raw text. It is especially valuable for citation auditing in research, journalism, or compliance workflows where provenance must be demonstrated.
Side effects
- Source URL is inaccessible or returns a non-200 status — sources array may be empty and verdict may be 'unverifiable'
- Claim is ambiguous or too vague for meaningful comparison — low confidence score returned
- Source page content is behind a login or paywall — extraction fails, source omitted from proof
- Malformed or missing required fields (urls or claim) — HTTP 4xx validation error
- Network timeout on source fetch — partial results or error response
- Confidence score near 0.5 indicates insufficient evidence either way
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlsrequired | array | Public source URLs |
| claimrequired | string | Claim to compare with the supplied sources |
Output
Schema · Response
{
"type": "json",
"example": {
"claim": "Example claim",
"proof": {
"bundleSha256": "0000000000000000000000000000000000000000000000000000000000000000"
},
"sources": [],
"verdict": "consistent",
"confidence": 0.75
}
}Tags
x402
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