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a paper title; the answer says whether the work exists, what it is (title, authors, year, container) and whether it has been retracted.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 Crossr
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 297 ms
- Price
- $0.020 per call
- Paying buyers, last 30 days
- 2 (directory's own records)
- Paid calls, last 30 days
- 6
- Category
- Unclassified
- Address
- https://factstamp.agentrails.workers.dev/citation
Accuracy: paid answers checked against an independent record
Not yet in our paid checks. A seller we have not checked has neither passed nor failed.
For agents
This page as JSON: /sellers/a1ea608681c0.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).