API Reference
5 endpoints for Research: Inspect paper metadata; Read a research paper; Get paper references or citing papers; Search research papers; List paper sources.
curl -X GET "https://api.crawlora.net/api/v1/research/papers/metadata?paper_id=17299597" \
-H "x-api-key: $CRAWLORA_API_KEY"/research/papers/metadataapiKey1 credit/requestReturn paper records including titles, abstracts when available, authors, publication dates and verified identifier aliases. Europe PMC resolution is limited to MED-backed PMID, PMCID and DOI records; no full-text body is fetched.
Required: paper_id.
Sampled 14 Oct 2026: 4 items. Filled in every item: name. In the sample: name: “Tenaillon O” and 3 other values.
/research/papers/readapiKey1 credit metadata-only · 5 full textReturn licensed Europe PMC body prose, question-ranked passages, byte locators, license and content provenance. Restricted or unavailable bodies return metadata-only availability; arXiv does not fetch PDFs. Full text costs 5 credits, metadata-only reads 1.
Required: request.
Sampled 14 Oct 2026: 4 items. Filled in every item: name. In the sample: name: “Tenaillon O” and 3 other values.
/research/papers/relatedapiKey3 credits/seed · up to 30Return one-hop Europe PMC citation edges, canonical seed IDs, source provenance and a frozen owner-bound cursor. Modes are references and citers; intent is unsupported. Partial results explicitly report indexed-source and candidate-window limits.
Required: request.
Sampled 14 Oct 2026: 1 item. Filled in every item: paper, rank.
/research/papers/searchapiKeyup to 12 credits/requestSearch arXiv papers with an owner-bound frozen result window and cursor-only continuation. When arXiv is rate limited or unavailable, an undated search is answered from OpenAlex's index of arXiv papers and the response says so in coverage and warnings.
Optional: q, limit, sources, authors, published_from, published_to, cursor.
Sampled 14 Oct 2026: 40 items. Filled in every item: paper, rank. In the sample: rank: 1 to 40, median 20.
/research/sourcesapiKey0 credits/requestReturn the stable authenticated paper source registry, including arXiv search and MED-backed Europe PMC metadata, licensed text and citation operations.
Takes no parameters.
Sampled 14 Oct 2026: 2 items. Filled in every item: source_id, name, corpus, url, state, operations, corpus_revision. Not in every item: filters (1). In the sample: name: “arXiv” and 1 other value; url: arxiv.org and 1 other host; operations: median 3 entries; corpus: “papers” and 1 other value; state: “ready”; filters: median 3 entries; corpus_revision: “papers-v2-20261010”.