Scholar Sidekick - Free citation API for 10,000+ styles

Free citation API and first-party MCP server. Resolves DOIs, PMIDs, PMCIDs, ISBNs, ISSNs, arXiv IDs, ADS bibcodes, and WHO IRIS URLs into 10,000+ CSL styles. Identifier-first, deterministic via x-scholar-transform-version, with a public source manifest. Works with Claude, Cursor, and Windsurf via MCP.

Scholar Sidekick is for anyone whose work touches scholarly citations — AI agent developers wiring citation lookups into LLMs, researchers or clinicians who need authoritative registry metadata, systematic-review teams running batch resolution, and students who want a friction-free generator. • AI agent developers integrating citation lookups into Claude / Cursor / Windsurf • Researchers and clinicians who need authoritative metadata, not URL scraping • Systematic-review teams resolving large batches of identifiers reproducibly • Developers piping DOI / PMID / arXiv ids through scripts, CI jobs, or LLM agents • Students wanting a free citation generator without ads or plagiarism prompts

Scholar Sidekick includes: • Free citation API + first-party MCP server (Claude, Cursor, Windsurf) • 8 identifier types: DOI, PMID, PMCID, ISBN, ISSN, arXiv, ADS bibcode, WHO IRIS URL • 10,000+ CSL citation styles (APA, MLA, Chicago, Vancouver, AMA, IEEE, and the rest of the registry) • Deterministic output via x-scholar-transform-version — audit-grade reproducibility • Live retraction-watch and open-access classification (Gold / Green / Hybrid / Bronze) • Nine free tools: DOI Lookup, DOI to BibTeX, DOI to RIS, PMID Converter, Style Comparator, and more

• Wire deterministic citation generation into an LLM agent or AI research-assistant product • Add DOI / PMID / arXiv resolution to a knowledge-management SaaS without writing scrapers • Embed bibliography export (BibTeX, RIS, EndNote XML) in a writing or note-taking app • Build a systematic-review automation pipeline that resolves thousands of references reproducibly • Drop the MCP server into Claude, Cursor, or Windsurf so customers can ask for citations in natural language

Free anonymous tier at scholar-sidekick.com — no signup, no API key, all 10,000+ CSL styles, nine free tools, MCP server included. Paid plans via RapidAPI scale from a free 500-requests/month key up to enterprise volumes. No per-style paywall, no Word-export upsell, no plagiarism prompts.

Scholar Sidekick is listed under Developer Tools, Education, SaaS on Launch Llama.

Click the "Visit Website" button on this page to go directly to Scholar Sidekick. You can also upvote and leave a review to help other founders discover it.

It resolves scholarly identifiers (DOI, PMID, PMCID, ISBN, ISSN, arXiv ID, ADS bibcode, WHO IRIS URL) into formatted citations across 10,000+ CSL styles. Available as a free REST API, a first-party MCP server (Claude / Cursor / Windsurf), and nine purpose-built free web tools.

Yes. The anonymous tier at scholar-sidekick.com requires no signup, no API key, and covers all 10,000+ CSL styles, all nine free tools, and the MCP server. Paid plans are sold via RapidAPI for higher request volumes — free 500-requests/month tier up to enterprise. No per-style paywall, no Word-export upsell.

Install via npx in Claude Desktop, Cursor, or Windsurf with one config block, set a RapidAPI key in the env, and your assistant can resolve and format citations through natural language — no glue code or custom integration. Five MCP tools: resolveIdentifier, formatCitation, exportCitation, checkRetraction, checkOpenAccess.

Identifier-first vs URL-first. Most citation generators scrape URLs you paste; Scholar Sidekick resolves identifiers live from authoritative registries (Crossref, PubMed, DataCite, OpenAlex). Output is deterministic and version-pinned via x-scholar-transform-version — same input produces byte-identical output across requests. There is also a public REST API and MCP server, which the URL-paste generators do not have.

Yes — that is one of the core use cases. The x-scholar-transform-version response header pins the formatter chain to a specific snapshot, so identical inputs at a fixed version produce byte-identical output. The resolver chain is publicly declared at /.well-known/sources.json, and copy-paste verification curls live at /verification so reviewers can independently confirm reproducibility.

Yes — both. Live Retraction Watch integration via /tools/retraction-checker (or the ?checks=retraction flag on /api/format) flags retractions, corrections, and expressions of concern. Live Unpaywall integration via /tools/open-access-checker classifies open-access status (Gold / Green / Hybrid / Bronze) and surfaces a free PDF link when one exists.

No. Scholar Sidekick is stateless by design — no library, no Cite-While-You-Write Word plugin, no in-browser bibliography. Pair with Zotero or EndNote for those workflows. Scholar Sidekick is purpose-built for identifier-first resolution, scripting, and agent integration; the comparison pages at /compare/ document where the trade-off makes sense in either direction.