# Research Paper Checks

Verify citations, catch retracted papers, and profile papers, authors, journals and institutions from Crossref and OpenAlex.

## How to pay

Machine-payable over x402. USDC on: Base (eip155:8453), Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp), Polygon (eip155:137), Arbitrum One (eip155:42161).
No accounts. No API keys. No signup. The paying wallet is the account.

## Machine-readable

- OpenAPI: https://research-papers.x402tookit.com/openapi.json
- x402 manifest: https://research-papers.x402tookit.com/.well-known/x402
- Catalog (free): https://research-papers.x402tookit.com/catalog
- Health (free): https://research-papers.x402tookit.com/health
- Uptime (free): https://research-papers.x402tookit.com/uptime

## Endpoints (8)

### GET /author-profile — $0.02
Researcher profile by name: works, citations, h-index and institution of the best match, with an ambiguity warning.
Params: name: string
Example: https://research-papers.x402tookit.com/author-profile?name=Geoffrey+Hinton

### GET /citation-verify — $0.02
Verify a citation: does the DOI exist, does its real title match the claimed title, and has it been retracted?
Params: doi: string, title?: string, year?: integer
Example: https://research-papers.x402tookit.com/citation-verify?doi=10.1038%2Fnature12373&title=Nanometre-scale+thermometry+in+a+living+cell&year=2013

### GET /doi-metadata — $0.02
Clean bibliographic metadata for a DOI from Crossref: authors, journal, pages, publisher, license, plus a ready citation string.
Params: doi: string
Example: https://research-papers.x402tookit.com/doi-metadata?doi=10.1038%2Fnature12373

### GET /institution-profile — $0.02
Research institution profile by name: type, country, works, citations, h-index and top research topics.
Params: name: string
Example: https://research-papers.x402tookit.com/institution-profile?name=Massachusetts+Institute+of+Technology

### GET /journal-profile — $0.02
Journal profile by name: output, citations, h-index, open-access status, DOAJ listing, article fee and quality flags.
Params: name: string
Example: https://research-papers.x402tookit.com/journal-profile?name=PLOS+ONE

### GET /paper-lookup — $0.03
Paper profile by DOI: title, journal, year, citations, field-weighted impact, open-access link and retraction state.
Params: doi: string
Example: https://research-papers.x402tookit.com/paper-lookup?doi=10.1038%2Fnature12373

### GET /paper-retraction-check — $0.02
Has this paper been retracted, corrected or flagged? Notices from Crossref and Retraction Watch for a DOI.
Params: doi: string
Example: https://research-papers.x402tookit.com/paper-retraction-check?doi=10.1177%2F1758835919874651

### GET /topic-papers — $0.02
Recent research papers on a topic from OpenAlex: title, year, citations, DOI and open-access link, most relevant first.
Params: topic: string, since_year?: integer, n?: integer
Example: https://research-papers.x402tookit.com/topic-papers?topic=retrieval+augmented+generation&since_year=2024&n=6

## Terms

Scholarly metadata computed from Crossref (including Retraction Watch data) and OpenAlex (CC0), provided as is, with no warranty of completeness. Retraction and correction notices lag; a paper can be unreliable without any notice. Author and institution matching by name is approximate. Not affiliated with Crossref or OpenAlex.