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Fact Check / Verify Claim Against Live Web Sources
x402
Fact Check / Verify Claim Against Live Web Sources is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Searches the live web via Brave, reads top pages, and uses Llama 4 Scout to return a verdict (supported, contradicted, mixed, or unverified) with explanation and citations for a given claim.
Price / call$0.01
Success—
StatusUnknown
How this service works
Check a claim against the live web in one call: a Brave search, the top pages read, and a verdict from Llama 4 Scout using those sources only (supported, contradicted, mixed or unverified) with a short explanation, [n] citations and the sources. A model's reading of a few search results, not an editorial fact-check. Results are for immediate use only (Brave API terms). Use to screen a statement before an agent repeats or acts on it.
Output
Returns a JSON object containing: the original claim, the model used (Llama 4 Scout), a terms field, a verdict string (supported, contradicted, mixed, or unverified), a short natural-language explanation of the verdict, and an array of numbered source citations each with URL and title. Results are for immediate use only per Brave API terms.
Example use cases
Screen viral claim before sharing
“I just saw a post saying 'mRNA vaccines alter human DNA permanently' — can you check that claim against current web sources and give me a verdict before I decide whether to retweet it?”
Verify news headline accuracy
“Can you fact-check this for me: 'Elon Musk sold all his Tesla shares in 2024' — search the live web and tell me if it's supported, contradicted, or unverified with your sources?”
Validate statistic in draft report
“Before I finalize this report, please verify the claim 'global electric vehicle sales exceeded 14 million units in 2023' against current web sources and give me a verdict with citations.”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/ai/fact-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs a fast, automated pre-flight check on a specific claim before repeating or acting on it — especially in pipelines that generate or relay factual statements. Prefer this over manual search when you want a structured verdict with citations in a single call. Not a substitute for authoritative editorial fact-checking; best suited for screening, not definitive adjudication. Use when the claim is self-contained and under 400 characters.
Side effects
- Claim exceeds 400 characters — request rejected
- Brave search returns no relevant results — verdict returned as 'unverified'
- Top pages are paywalled or dynamically rendered and cannot be read — limited source quality
- Model may misinterpret ambiguous or context-dependent claims
- Results reflect model reading of search snippets, not authoritative editorial fact-checking
- Transient Brave API or Workers AI outage — HTTP 5xx returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claimrequired | string | The claim to check, at most 400 characters |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| claim | string | |
| model | string | |
| terms | string | |
| sources | array | |
| verdict | string | |
| explanation | string |
Tags
x402
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