Paper

DOI metadata lookup. 1 pay-per-call paper endpoint for AI agents — keyless, USDC via x402.

WATCHERS Don't poll — get woken up

Arm a paid watcher on paper and we push a signed callback the moment it happens — no polling loop. All watchers →

Paper $0.05get a signed callback when a new academic paper matching your query is published (arXiv / PubMed / Semantic Scholar).
paper.doi-lookup$0.0012
Resolve a DOI to authoritative bibliographic metadata via Crossref.
GET /api/paper/doi-lookup

Discovery