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api.kadec0.xyz v1 paper-details
https://api.kadec0.xyz/v1/paper-details
payable
Citation lookup and reference list for a paper. Given a DOI, arXiv id, OpenAlex id, or PMID, returns its references (the works it cites) and its cited-by list (recent works that cite it), plus full metadata and citation count — for bibliography building and citation lookup. Keyless via OpenAlex and Semantic Scholar.
We sent a real
GET request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.03
- Network
- base
- Pay to
- 0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- GET
- Response latency
- 60 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:11:35.386Z (1d ago)
- Category
- search
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.kadec0.xyz%2Fv1%2Fpaper-details"