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FactStamp Dated Claim Verifier
x402
FactStamp Dated Claim Verifier is a paid API for AI agents from factstamp.agentrails.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-16).
Checks a specific dated numeric or factual claim against Australian primary-source data series and returns a verdict of verified, stale, contradicted, or unknown with an as-of date.
Price / call$0.05
Success—
StatusUnknown
How this service works
Check a dated figure you are about to act on against the publisher's own series, and receive verified, stale, contradicted or unknown with the as-of date. Call it before committing a number to a page, deck, model or decision. Coverage today is Australian primary sources; anything outside coverage returns unknown rather than a guess.
Output
A JSON object containing the verdict (one of: verified, stale, contradicted, or unknown), the as-of date for the data, the publisher name, the matched series ID, and the original claim string submitted. Returns 'unknown' rather than guessing when the claim falls outside current Australian primary-source coverage.
Example use cases
Pre-publication economic stat check
“I'm about to publish a report that says Australia's unemployment rate was 3.9% as of March 2025 — can you verify that figure against the ABS's official series before we go live?”
Financial model data validation
“We're building a DCF model and need to confirm whether the RBA cash rate figure we're using, 4.10% as of July 2025, is verified, stale, or contradicted by the Reserve Bank's own data.”
Policy brief fact-checking
“Before my team submits this policy brief, check whether our claim that Australia's CPI was 3.4% year-on-year as of Q1 2025 holds up against the official ABS series.”
Technical details
Endpoint
POSThttps://factstamp.agentrails.workers.dev/check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to verify a specific dated numeric or statistical claim against Australian government or authoritative primary-source series — particularly for economic indicators, central bank rates, or ABS statistics — before committing that figure to a document, model, or decision. It is purpose-built for single-claim validation with a clear verdict signal rather than general web search or broad fact-checking.
Side effects
- Claim outside Australian primary-source coverage returns verdict 'unknown' rather than an error
- Unrecognised or ambiguous series returns unknown verdict
- Malformed request body returns HTTP 400
- Payment not processed or insufficient USDC balance returns HTTP 402
- Service unavailable returns HTTP 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json",
"example": {
"as_of": "2026-08-01",
"claim": "The RBA cash rate is 4.35% as at August 2026",
"verdict": "contradicted",
"publisher": "Reserve Bank of Australia",
"series_id": "rate.rba_cash_target"
}
}Tags
x402
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