# Services from research-papers.x402tookit.com on Zero

> research-papers.x402tookit.com serves 8 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/research-papers.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/research-papers.x402tookit.com/health.json

## Services

- [Research Paper Retraction & Correction Check](https://www.zero.xyz/c/research-paper-retraction-correction-check-20d0acb1/llms.txt): $0.02/call via x402. Checks whether a research paper (by DOI) has been retracted, corrected, or flagged, using notices from Crossref and Retraction Watch.
- [Research Paper Checks – Journal Profile](https://www.zero.xyz/c/research-paper-checks-journal-profile-2d82e55c/llms.txt): $0.02/call via x402. Returns a comprehensive profile of an academic journal by name, including publication output, citations, h-index, open-access status, DOAJ listing, article processing charges, and quality flags.
- [Research Paper Checks – Author Profile by Name](https://www.zero.xyz/c/research-paper-checks-author-profile-by-name-131d87ca/llms.txt): $0.02/call via x402. Returns the best-matching researcher's profile by name, including works count, citation count, h-index, i10-index, institution, top topics, and an ambiguity warning if multiple authors could match.
- [Research Paper Topic Search via OpenAlex](https://www.zero.xyz/c/research-paper-topic-search-via-openalex-126a9e36/llms.txt): $0.02/call via x402. Returns recent research papers on a given topic from OpenAlex, ranked by relevance, with title, year, citation count, DOI, and open-access link.
- [Research Paper Profile by DOI](https://www.zero.xyz/c/research-paper-profile-by-doi-d2cd0d24/llms.txt): $0.03/call via x402. Returns a comprehensive profile for a research paper identified by DOI, including title, journal, year, citation count, field-weighted impact, open-access link, and retraction status.
- [Research Institution Profile Lookup](https://www.zero.xyz/c/research-institution-profile-lookup-145aeb9e/llms.txt): $0.02/call via x402. Returns a comprehensive academic profile for a named research institution, including type, country, publication count, citation count, h-index, and top research topics.
- [Research Paper Citation Verifier](https://www.zero.xyz/c/research-paper-citation-verifier-c989f2d0/llms.txt): $0.02/call via x402. Verifies a cited DOI exists, checks whether its registered title matches the claimed title, and reports retraction status
- [Research Paper Checks – DOI Bibliographic Metadata](https://www.zero.xyz/c/research-paper-checks-doi-bibliographic-metadata-6dd740db/llms.txt): $0.02/call via x402. Fetches clean bibliographic metadata for a research paper by DOI from Crossref, including authors, journal, pages, publisher, license, and a formatted citation string.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)