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fittings.sh crossref doi-metadata
https://fittings.sh/v1/crossref/doi-metadata
answers 402
Resolve a DOI to bibliographic metadata: title, authors, journal, dates, abstract, licence, funders and citation counts.
We sent a real
GET request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.003
- Network
- base
- Pay to
- 0xe025442C0d6dC17aD2b9eB888B3565bdFCd98638
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- GET
- Response latency
- 289 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:21:47.734Z (22d ago)
- Category
- identity
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Ffittings.sh%2Fv1%2Fcrossref%2Fdoi-metadata"