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Research papers

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si.fourzerotwo/researchv1.0.1 Domain verified

arXiv, PubMed, Crossref and OpenAlex scholarly metadata.

Research & Knowledge

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https://fourzerotwo.si/mcp/v/research

X-API-Key (optional)

Optional free key from https://fourzerotwo.si/free (raises the free allowance from 100 to 500 calls/day)

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arxiv__paper Read-only

Full metadata for up to 20 arXiv ids: title, authors, abstract, categories, dates, DOI, journal ref, links. Costs $0.001 USDC per call via x402.

idstring, required

arXiv id(s), comma-separated (e.g. 1706.03762)

Research papers MCP server | mcptry

Tools (38)

arxiv__paper

Full metadata for up to 20 arXiv ids: title, authors, abstract, categories, dates, DOI, journal ref, links. Costs $0.001 USDC per call via x402.

read-only

Argument	Type	Description
id*	string	arXiv id(s), comma-separated (e.g. 1706.03762)

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "arXiv id(s), comma-separated (e.g. 1706.03762)"
    }
  }
}

arxiv__recent

The newest submissions in any arXiv category. Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)
category*	string	Category, e.g. math.PR

Input schema (JSON)

{
  "type": "object",
  "required": [
    "category"
  ],
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    },
    "category": {
      "type": "string",
      "description": "Category, e.g. math.PR"
    }
  }
}

arxiv__recent-astro-ph

The newest arXiv submissions in astro-ph (Astrophysics). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-cs-ai

The newest arXiv submissions in cs.AI (Artificial Intelligence). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-cs-cl

The newest arXiv submissions in cs.CL (Computation and Language (NLP)). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-cs-cr

The newest arXiv submissions in cs.CR (Cryptography and Security). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-cs-cv

The newest arXiv submissions in cs.CV (Computer Vision). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-cs-lg

The newest arXiv submissions in cs.LG (Machine Learning). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-cs-ro

The newest arXiv submissions in cs.RO (Robotics). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-econ

The newest arXiv submissions in econ (Economics). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-q-bio

The newest arXiv submissions in q-bio (Quantitative Biology). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-q-fin

The newest arXiv submissions in q-fin (Quantitative Finance). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-quant-ph

The newest arXiv submissions in quant-ph (Quantum Physics). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__recent-stat-ml

The newest arXiv submissions in stat.ML (Statistics: Machine Learning). Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
limit	integer	Results, max 50 (default 25)

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 25)"
    }
  }
}

arxiv__search

Search arXiv by keywords, title, author and/or category; sort by relevance or newest. Costs $0.002 USDC per call via x402.

read-only

Argument	Type	Description
q	string	Keywords (all must match)
sort	string	relevance (default), submitted or updated
limit	integer	Results, max 50 (default 20)
start	integer	Offset for paging
title	string	Phrase in the title
author	string	Author name
category	string	Category, e.g. cs.CL

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "q": {
      "type": "string",
      "description": "Keywords (all must match)"
    },
    "sort": {
      "type": "string",
      "description": "relevance (default), submitted or updated"
    },
    "limit": {
      "type": "integer",
      "description": "Results, max 50 (default 20)"
    },
    "start": {
      "type": "integer",
      "description": "Offset for paging"
    },
    "title": {
      "type": "string",
      "description": "Phrase in the title"
    },
    "author": {
      "type": "string",
      "description": "Author name"
    },
    "category": {
      "type": "string",
      "description": "Category, e.g. cs.CL"
    }
  }
}

crossref__doi

Title, authors, journal, dates, references count and licence for a DOI. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
doi*	string	DOI

Input schema (JSON)

{
  "type": "object",
  "required": [
    "doi"
  ],
  "properties": {
    "doi": {
      "type": "string",
      "description": "DOI"
    }
  }
}

crossref__funders

Research funders by name, with Funder Registry ids. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
q*	string	Funder

Input schema (JSON)

{
  "type": "object",
  "required": [
    "q"
  ],
  "properties": {
    "q": {
      "type": "string",
      "description": "Funder"
    }
  }
}

crossref__journal

Journal title, publisher and DOI counts by ISSN. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
issn*	string	ISSN

Input schema (JSON)

{
  "type": "object",
  "required": [
    "issn"
  ],
  "properties": {
    "issn": {
      "type": "string",
      "description": "ISSN"
    }
  }
}

crossref__members

Crossref member publishers by name. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
q*	string	Publisher

Input schema (JSON)

{
  "type": "object",
  "required": [
    "q"
  ],
  "properties": {
    "q": {
      "type": "string",
      "description": "Publisher"
    }
  }
}

crossref__search

Bibliographic search across Crossref works. Free within the daily allowance, then $0.003 USDC per call via x402.

read-only

Argument	Type	Description
q*	string	Query

Input schema (JSON)

{
  "type": "object",
  "required": [
    "q"
  ],
  "properties": {
    "q": {
      "type": "string",
      "description": "Query"
    }
  }
}

pubmed__clinical-trials-search

PubMed citations that are clinical trial reports for a query. A few free samples a day, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
term*	string	Query with [pt] filter

Input schema (JSON)

{
  "type": "object",
  "required": [
    "term"
  ],
  "properties": {
    "term": {
      "type": "string",
      "description": "Query with [pt] filter"
    }
  }
}

pubmed__pmc-search

Free full-text article ids in PubMed Central. A few free samples a day, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
term*	string	Query

Input schema (JSON)

{
  "type": "object",
  "required": [
    "term"
  ],
  "properties": {
    "term": {
      "type": "string",
      "description": "Query"
    }
  }
}

pubmed__search

PubMed ids matching a query (supports PubMed query syntax). A few free samples a day, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
term*	string	Query

Input schema (JSON)

{
  "type": "object",
  "required": [
    "term"
  ],
  "properties": {
    "term": {
      "type": "string",
      "description": "Query"
    }
  }
}

pubmed__summary

Title, authors, journal, date and DOI for comma-separated PubMed ids. A few free samples a day, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
id*	string	PMIDs, comma separated

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "PMIDs, comma separated"
    }
  }
}

ror__affiliation

Turn a free-text affiliation (as printed on a paper) into the matching organisation, with ROR's confidence flag and candidates. Free within the daily allowance, then $0.001 USDC per call via x402.

read-only

Argument	Type	Description
affiliation*	string	Affiliation text

Input schema (JSON)

{
  "type": "object",
  "required": [
    "affiliation"
  ],
  "properties": {
    "affiliation": {
      "type": "string",
      "description": "Affiliation text"
    }
  }
}

ror__external-id

Find the organisation for a GRID id, ISNI, Wikidata QID or Crossref Funder ID. Free within the daily allowance, then $0.001 USDC per call via x402.

read-only

Argument	Type	Description
id*	string	GRID, ISNI, Wikidata QID or Crossref Funder ID

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "GRID, ISNI, Wikidata QID or Crossref Funder ID"
    }
  }
}

ror__organisation

Full record: names and aliases, types, status, founding year, location, website, domains, external ids. Free within the daily allowance, then $0.0005 USDC per call via x402.

read-only

Argument	Type	Description
id*	string	ROR id, e.g. 052gg0110 or https://ror.org/052gg0110

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "ROR id, e.g. 052gg0110 or https://ror.org/052gg0110"
    }
  }
}

ror__relationships

Parent, child and related organisations of a ROR record. Free within the daily allowance, then $0.001 USDC per call via x402.

read-only

Argument	Type	Description
id*	string	ROR id, e.g. 052gg0110 or https://ror.org/052gg0110

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "ROR id, e.g. 052gg0110 or https://ror.org/052gg0110"
    }
  }
}

ror__search

Find research organisations by name, acronym or keyword, optionally filtered by country and type. Free within the daily allowance, then $0.001 USDC per call via x402.

read-only

Argument	Type	Description
q*	string	Name, acronym or keyword
type	string	education, funder, healthcare, company, archive, nonprofit, government, facility, other
country	string	2-letter country code

Input schema (JSON)

{
  "type": "object",
  "required": [
    "q"
  ],
  "properties": {
    "q": {
      "type": "string",
      "description": "Name, acronym or keyword"
    },
    "type": {
      "type": "string",
      "description": "education, funder, healthcare, company, archive, nonprofit, government, facility, other"
    },
    "country": {
      "type": "string",
      "description": "2-letter country code"
    }
  }
}

scholarly__author

One researcher by OpenAlex id or ORCID. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
id*	string	OpenAlex id or orcid:…

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "OpenAlex id or orcid:…"
    }
  }
}

scholarly__authors-search

Researchers by name with h-index, works and citation counts. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
search*	string	Author name

Input schema (JSON)

{
  "type": "object",
  "required": [
    "search"
  ],
  "properties": {
    "search": {
      "type": "string",
      "description": "Author name"
    }
  }
}

scholarly__autocomplete

Fast title autocomplete across works. Free within the daily allowance, then $0.001 USDC per call via x402.

read-only

Argument	Type	Description
q*	string	Partial title

Input schema (JSON)

{
  "type": "object",
  "required": [
    "q"
  ],
  "properties": {
    "q": {
      "type": "string",
      "description": "Partial title"
    }
  }
}

scholarly__citing-works

Works that cite a given OpenAlex work id. Free within the daily allowance, then $0.003 USDC per call via x402.

read-only

Argument	Type	Description
work*	string	Filter, e.g. cites:W2919115771

Input schema (JSON)

{
  "type": "object",
  "required": [
    "work"
  ],
  "properties": {
    "work": {
      "type": "string",
      "description": "Filter, e.g. cites:W2919115771"
    }
  }
}

scholarly__institutions-search

Universities and research institutions with output stats. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
search*	string	Institution

Input schema (JSON)

{
  "type": "object",
  "required": [
    "search"
  ],
  "properties": {
    "search": {
      "type": "string",
      "description": "Institution"
    }
  }
}

scholarly__sources-search

Journals and repositories with impact stats. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
search*	string	Journal

Input schema (JSON)

{
  "type": "object",
  "required": [
    "search"
  ],
  "properties": {
    "search": {
      "type": "string",
      "description": "Journal"
    }
  }
}

scholarly__topics-search

Research topics and fields. Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
search*	string	Topic

Input schema (JSON)

{
  "type": "object",
  "required": [
    "search"
  ],
  "properties": {
    "search": {
      "type": "string",
      "description": "Topic"
    }
  }
}

scholarly__work

One work by OpenAlex id (W…) or "doi:10.…". Free within the daily allowance, then $0.002 USDC per call via x402.

read-only

Argument	Type	Description
id*	string	OpenAlex id or doi:…

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "OpenAlex id or doi:…"
    }
  }
}

scholarly__works-search

Full-text search of scholarly works, with citations, authors and open-access links. Free within the daily allowance, then $0.003 USDC per call via x402.

read-only

Argument	Type	Description
search*	string	Query

Input schema (JSON)

{
  "type": "object",
  "required": [
    "search"
  ],
  "properties": {
    "search": {
      "type": "string",
      "description": "Query"
    }
  }
}