Task

Crossref

1 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.

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 2026-10-26

0.003 USDC per call per call

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