| https://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a paper title; the answer says whether the work exists, what it is (title, authors, year, container) and whether it has been retracted. A title that is absent from both Crossref and arXiv returns not_found, and a ne | base | USDC | $0.02 | exact |
| https://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 Register (ABN, ACN, GST, status). Call it before naming a company in a contract, invoice or filing, or when you need an ide | base | USDC | $0.10 | exact |
| https://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 it before committing a number to a page, deck, model or decision. Coverage today is Australian primary sources; anything | base | USDC | $0.05 | exact |
| https://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 registered office, SIC activity and previous names, the filing position, a sanctions screen across four lists, and the owne | base | USDC | $0.438119 | exact |
| https://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 cents for the same lookups one at a time. Every item is answered by the same door that answers a single call, so the verd | base | USDC | $0.12 | exact |
| https://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 verified against dated primary sources, as one signed bundle with a per-claim receipt and its licence. Claims we cannot ans | base | USDC | $0.25 | exact |
| https://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 version exists, whether it is yanked or deprecated, and every advisory OSV lists against it. A version that was never p | base | USDC | $0.02 | exact |
| https://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$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each r | base | USDC | $0.50 | exact |
| https://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 days under one token. US$5 a portfolio — 20 cents a reference, under a cent a check. Every reference is answered and signe | base | USDC | $5.00 | exact |
