Research Papers API for Agents
Pricing
from $0.01 / 1,000 results
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Research Papers API for Agents
Search OpenAlex, arXiv and Crossref in one unified, token-efficient JSON schema built for AI research agents.
Research Papers API for Agents
Pricing
from $0.01 / 1,000 results
Search OpenAlex, arXiv and Crossref in one unified, token-efficient JSON schema built for AI research agents.
Source
source
Optional
Which open scholarly API this paper came from.
Title
title
Optional
Paper title.
Year
year
Optional
Publication year.
Venue
venue
Optional
Journal/conference/repository name. Null for arXiv preprints that have no recorded journal_ref.
Citations
citations
Optional
Times cited, per the source. Always null for arXiv (no citation data available from that source).
DOI
doi
Optional
Bare DOI (e.g. "10.1038/s41586-021-03819-2"), normalized without the https://doi.org/ prefix. Used for cross-source deduplication; null when the source/paper has none (common for arXiv preprints).
Abstract
abstract
Optional
Paper abstract. Null when 'include_abstract' was false, or when the source doesn't provide one (Crossref: only a minority of records).
Open-access PDF URL
oa_pdf_url
Optional
Direct link to a (usually) freely downloadable PDF. Always present for arXiv. For Crossref this is best-effort and sometimes still requires a subscription in practice (see README limitations).
Concepts / categories
concepts
Optional
Topic tags: OpenAlex concepts (top 10 by relevance), arXiv subject categories (e.g. "cs.CL"), or empty for Crossref (no comparable classification available).
URL
url
Optional
Link to the paper's landing page on its source.
