Task

Doi Lookup

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.

Citations, References, Cited-By x402 REST usage

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...

api.kadec0.xyz Search & Research 31 calls / 30d checked 2026-10-31

0.03 USDC per call per call

Citation and Retraction Check x402 REST usage

Verify references before you publish or rely on them: up to 10 citations per call, as reference strings in any style, DOIs, or {title, authors, year, doi}. For each: status verified, mismatch (the work exists but authors...

agentsvc.io Other services 5 calls / 30d checked 2026-10-31

0.005 USDC per call per call

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