Task

Crossref

2 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.

Papers x402 REST usage

Academic literature from Crossref, the DOI registry itself. Search by topic, author or exact DOI and get normalised records with citation counts, journal, publisher, authors with affiliations, and an open-access flag, pl...

x402-filings.datalayer.workers.dev Search & Research 2 calls / 30d checked 2026-11-01

0.01 USDC per call per call

DOI metadata and citation x402 REST usage

Metadata of a publication by DOI (Crossref): title, authors, journal or publisher, year, type, citation count, references, license, link and an APA-formatted citation.

api.vextorium.com Search & Research 6 calls / 30d checked 2026-10-28

0.003 USDC per call per call

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