factstamp.agentrails.workers.dev
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a paper title; the answer says whether the work exists, what it is (title, authors, year, container) and whether it has been retracted.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…
Visit factstamp.agentrails.workers.dev
| Host | factstamp.agentrails.workers.dev |
|---|---|
| Price | $0.02–$5.00 per call |
| Network | Base |
| Paid endpoints listed | 9 |
| Calls, last 30 days* | 18 |
| Most unique payers on one endpoint (30 days)* | 2 |
| Last paid call* | 2026-10-09 |
* From the public x402 Bazaar index (snapshot 2026-10-18T04:07Z); reported by the facilitator, not measured by us.
Endpoints
| URL | Method | Price |
|---|---|---|
https://factstamp.agentrails.workers.dev/citationCheck a citation before repeating it. Give a DOI, an arXiv ID or a paper title; the answer says whether the work… | POST | $0.02 |
https://factstamp.agentrails.workers.dev/entityVerify whether a legal entity exists and is currently registered, from open primary registers: the GLEIF LEI index, US… | POST | $0.10 |
https://factstamp.agentrails.workers.dev/checkCheck a dated figure you are about to act on against the publisher's own series, and receive verified, stale,… | POST | $0.05 |
https://factstamp.agentrails.workers.dev/entity-fileWhen you need the whole picture of one company before you sign, onboard, pay or acquire, call the entity file: ONE… | POST | $0.44 |
https://factstamp.agentrails.workers.dev/watch/portfolioWatch a whole list at once, when a bibliography or a dependency manifest has to stay true: up to 25 citations or… | POST | $5.00 |
https://factstamp.agentrails.workers.dev/watchBuy a standing re-check of one citation or one package version, when an answer has to stay true rather than be true… | POST | $0.50 |
https://factstamp.agentrails.workers.dev/bulkCheck a whole bibliography or dependency manifest in one round trip, before you rely on the list: up to 12 items at a… | POST | $0.12 |
https://factstamp.agentrails.workers.dev/documentCall it before you send, file or publish a document that quotes figures, names companies or cites papers. Post the… | POST | $0.25 |
https://factstamp.agentrails.workers.dev/packageCheck a dependency before installing it. Give a package and, optionally, a version with its ecosystem (npm, PyPI,… | POST | $0.02 |
Source: x402 Bazaar discovery API (Coinbase CDP) · Licence: Public discovery metadata; descriptions by each provider. Listed in x402 pay-per-call APIs. We list tools; we do not test, rate or endorse them.
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