factstamp.agentrails.workers.dev

factstamp.agentrails.workers.dev · 9 paid endpoints · listed 2026-10-27

Check a citation before repeating it. Give a DOI, an arXiv ID or a paper title; the answer says whether the work exists, what it is (title, authors, year, container) and whether it has been retracted. A title that is absent from both Crossref and arXiv returns not_found, and a near title match is never reported as verified. Cited to the source record with its retrieval time. Verdicts: verified, ambiguous, retracted, not_found, unknown.

livelast check 24 h ago

100%valid x402 answers, 72 h

$0.30USDC received on Base, 7 days

1distinct payers, 7 days

52.9score (0-100)

Paid endpoints

Method	Endpoint	Price	Networks
POST	factstamp.agentrails.workers.dev/citation Check a citation before repeating it. Give a DOI, an arXiv ID or a paper title; the answer says whether the work exists, what it is (title, authors, year, conta	$0.02	Base
POST	factstamp.agentrails.workers.dev/package Check a dependency before installing it. Give a package and, optionally, a version with its ecosystem (npm, PyPI, crates.io); the answer says whether that exact	$0.02	Base
POST	factstamp.agentrails.workers.dev/check 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	$0.05	Base
POST	factstamp.agentrails.workers.dev/entity Verify whether a legal entity exists and is currently registered, from open primary registers: the GLEIF LEI index, US SEC EDGAR and the Australian Business Reg	$0.10	Base
POST	factstamp.agentrails.workers.dev/bulk Check a whole bibliography or dependency manifest in one round trip, before you rely on the list: up to 12 items at a flat US$0.12 — 1 cent an item, against 2 c	$0.12	Base
POST	factstamp.agentrails.workers.dev/document Call it before you send, file or publish a document that quotes figures, names companies or cites papers. Post the text and every checkable claim comes back ver	$0.25	Base
POST	factstamp.agentrails.workers.dev/entity-file When you need the whole picture of one company before you sign, onboard, pay or acquire, call the entity file: ONE answer holding identity and standing, the reg	$0.438119	Base
POST	factstamp.agentrails.workers.dev/watch Buy a standing re-check of one citation or one package version, when an answer has to stay true rather than be true once: re-checked every day for 30 days. US$0	$0.50	Base
POST	factstamp.agentrails.workers.dev/watch/portfolio Watch a whole list at once, when a bibliography or a dependency manifest has to stay true: up to 25 citations or package versions re-checked every day for 30 da	$5.00	Base

Latest checks

When	Endpoint	HTTP	ms	Result
24 h ago	factstamp.agentrails.workers.dev/check	402	94	valid x402 v2 terms
6 days ago	factstamp.agentrails.workers.dev/bulk	402	555	valid x402 v2 terms

Income on Base (7 days)

Day		Transfers	USDC
2026-10-31		2	$0.04
2026-10-28		4	$0.26

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<a href="https://logicnodes.io/observatory/p/factstamp.agentrails.workers.dev"><img src="https://logicnodes.io/observatory/badge/factstamp.agentrails.workers.dev.svg" alt="x402 status"></a>

Claim it for free with x402_provider_claim (sign with your payout address), and get an alert within minutes when it stops answering with x402_monitor_create ($5 for 30 days). Both work over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/<tool>.

Income is all USDC received by the provider's payout address on Base, whatever the source. Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. JSON: /v1/observatory/providers/factstamp.agentrails.workers.dev