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HubVibe Claim Verification
x402
HubVibe Claim Verification is a paid API for AI agents from hubvibe-io.com, paid per call via x402, $5/call, status unknown (last checked 2026-10-10).
Checks up to 10 specific claims against up to 4 source URLs and returns SUPPORTED, CONTRADICTED, or UNSUPPORTED verdicts with supporting quotes.
Price / call$5
Success—
StatusUnknown
How this service works
Fact check claims against sources: up to 10 claims checked against up to 4 source URLs you name; each comes back SUPPORTED, CONTRADICTED or UNSUPPORTED with the exact quote the verdict rests on. Use it to verify AI output, citations or statements before publishing. Input: claims[], sources[]. A question but no sources yet: research.web.
Output
For each claim submitted, the endpoint returns a verdict of SUPPORTED, CONTRADICTED, or UNSUPPORTED, along with the specific quote from the source URL that the verdict is based on. Results are per-claim, cross-referenced against the provided source URLs.
Example use cases
Fact-checking a competitor's marketing
“I need you to verify these two claims against our competitor's website: '24/7 customer support is included' and 'no setup fees required'. Check them against https://competitor.com/pricing and https://competitor.com/support and tell me if each claim is supported, contradicted, or just not mentioned.”
Validating PR content before publication
“Before we publish this press release, can you verify that these claims are actually supported by our own website? Claims: 'We serve over 10,000 customers', 'Our platform is HIPAA compliant', and 'We integrate with Salesforce'. Check against https://ourbrand.com/about and https://ourbrand.com/security.”
Auditing cited sources in research
“I have a report that cites these three facts and I want to know if the cited pages actually back them up: claim 1 is 'unemployment dropped to 3.5% in Q4', claim 2 is 'inflation peaked at 9.1%'. Check them against https://bls.gov/news.release/empsit.htm and https://bls.gov/cpi.”
Technical details
Endpoint
POSThttps://hubvibe-io.com/work/verify/claims?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need structured, quote-backed verdicts on specific factual claims against known URLs — especially when you already know which source pages to check. It is better than a generic web search for claim verification because it returns precise SUPPORTED/CONTRADICTED/UNSUPPORTED verdicts with the exact quote used as evidence. Prefer it over manual page scraping when you need claim-level granularity across multiple sources in a single call.
Side effects
- Source URL is inaccessible or returns a non-200 status — claim may come back UNSUPPORTED by default
- More than 10 claims submitted — request likely rejected or truncated
- More than 4 source URLs submitted — additional sources may be ignored
- Source page is JavaScript-rendered and content is not crawlable — claim verdict may be inaccurate
- Claim is too vague or ambiguous for the system to match against source text — returns UNSUPPORTED
- Rate limiting or payment failure — 402 or 429 error returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claims | array | |
| sources | array | |
| language | string |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"model": "gemini-2.5-flash",
"claims": [
"HubVibe sells machine-payable site audits."
],
"verdicts": [
{
"claim": "HubVibe sells machine-payable site audits.",
"quote": "Every check is priced per call over HTTP 402.",
"verdict": "SUPPORTED",
"source_n": 1
}
],
"sources_read": [
{
"n": 1,
"url": "https://example.com/about",
"title": "About Example"
}
],
"sources_unread": []
},
"status": "ok",
"worker": "verify.claims",
"price_usd": 5,
"provenance": {
"steps": [
{
"ms": 640,
"ok": true,
"step": "claims",
"provider": "web"
}
],
"attempts": 1,
"elapsed_ms": 660,
"providers_used": [
"web"
]
},
"receipt_id": "rcpt_9f1c2b3a4d5e6f70",
"receipt_url": "/work/receipts/rcpt_9f1c2b3a4d5e6f70"
}
}Tags
x402
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