Academic Papers API: OpenAlex, Crossref, arXiv for AI agents
Pricing
from $2.00 / 1,000 paper returneds
Search scholarly papers across OpenAlex, Crossref and arXiv in one run. Clean, DOI-deduplicated records with title, authors, year, venue, citations, open-access status and PDF/landing links. Open-licensed metadata, built for AI agents, RAG and literature reviews.
Keywords to search for in paper titles and abstracts, e.g. 'large language models' or 'CRISPR gene editing'. Advanced: arXiv field syntax such as 'cat:cs.CL AND ti:retrieval' is passed straight to arXiv.
Which open databases to search. Leave empty for all three.
[ "openalex", "crossref", "arxiv"]Only papers published in or after this year.
Only papers published in or before this year.
Only return papers that are free to read (OpenAlex OA flag, a Creative Commons licence on Crossref, or arXiv).
Relevance mixes the best matches from each source. Citations puts the most-cited first (citation counts come from OpenAlex and Crossref; arXiv has none). Newest puts the latest publications first.
Maximum number of unique papers to return (after removing duplicates). You pay per paper returned.
Adds the abstract for arXiv papers (arXiv metadata is CC0). Abstracts from other sources are never included because publishers may hold copyright in them.
Optional. Without a key, OpenAlex shares a small free daily quota per network. A free key from openalex.org/settings/api gives you your own quota. If the shared quota runs out, the run continues with Crossref and arXiv.