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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "research": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp/v/research",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

claude mcp add --transport http research https://fourzerotwo.si/mcp/v/research --header "X-API-Key: ${X_API_KEY}"

[mcp_servers.research]
url = "https://fourzerotwo.si/mcp/v/research"
env_http_headers = { "X-API-Key" = "X_API_KEY" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "research": {
      "type": "remote",
      "url": "https://fourzerotwo.si/mcp/v/research",
      "enabled": true,
      "headers": {
        "X-API-Key": "{env:X_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "research": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp/v/research",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=research&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vZm91cnplcm90d28uc2kvbWNwL3YvcmVzZWFyY2giLCJoZWFkZXJzIjp7IlgtQVBJLUtleSI6IiR7WF9BUElfS0VZfSJ9fQ%3D%3D"
}

{
  "servers": {
    "research": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp/v/research",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "research": {
      "httpUrl": "https://fourzerotwo.si/mcp/v/research",
      "headers": {
        "X-API-Key": "${X_API_KEY}"
      }
    }
  }
}

extensions:
  "research":
    enabled: true
    name: "research"
    type: streamable_http
    uri: "https://fourzerotwo.si/mcp/v/research"
    headers:
      "X-API-Key": "${X_API_KEY}"
    timeout: 300

Placeholders to fill from your own secret store: ${X_API_KEY}. The registry never accepts secret values.

Quality 91 / 100strong

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene100 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
pass
tools.annotations38 of 38 tools declare readOnlyHint or destructiveHint
pass
tools.directory_hintsevery tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
pass
tools.token_costabout 3,816 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

38 tools, about 3,816 tokens to load them all · tool set 3a189eff5d27 · checked 2026-10-20 03:37 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 82 / 100

no-repository

provenance55

liveness99

freshness100

hygiene80

+dns-namespace +website +reachable +uptime-97% +updated-8d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://fourzerotwo.si/mcp/v/research` streamable-http	none	yes	97%	578 ms	2025-11-25	2026-10-20

Tools (38)

`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.
`arxiv__recent`read-only	The newest submissions in any arXiv category. Costs $0.002 USDC per call via x402.
`arxiv__recent-astro-ph`read-only	The newest arXiv submissions in astro-ph (Astrophysics). Costs $0.002 USDC per call via x402.
`arxiv__recent-cs-ai`read-only	The newest arXiv submissions in cs.AI (Artificial Intelligence). Costs $0.002 USDC per call via x402.
`arxiv__recent-cs-cl`read-only	The newest arXiv submissions in cs.CL (Computation and Language (NLP)). Costs $0.002 USDC per call via x402.
`arxiv__recent-cs-cr`read-only	The newest arXiv submissions in cs.CR (Cryptography and Security). Costs $0.002 USDC per call via x402.
`arxiv__recent-cs-cv`read-only	The newest arXiv submissions in cs.CV (Computer Vision). Costs $0.002 USDC per call via x402.
`arxiv__recent-cs-lg`read-only	The newest arXiv submissions in cs.LG (Machine Learning). Costs $0.002 USDC per call via x402.
`arxiv__recent-cs-ro`read-only	The newest arXiv submissions in cs.RO (Robotics). Costs $0.002 USDC per call via x402.
`arxiv__recent-econ`read-only	The newest arXiv submissions in econ (Economics). Costs $0.002 USDC per call via x402.
`arxiv__recent-q-bio`read-only	The newest arXiv submissions in q-bio (Quantitative Biology). Costs $0.002 USDC per call via x402.
`arxiv__recent-q-fin`read-only	The newest arXiv submissions in q-fin (Quantitative Finance). Costs $0.002 USDC per call via x402.
`arxiv__recent-quant-ph`read-only	The newest arXiv submissions in quant-ph (Quantum Physics). Costs $0.002 USDC per call via x402.
`arxiv__recent-stat-ml`read-only	The newest arXiv submissions in stat.ML (Statistics: Machine Learning). Costs $0.002 USDC per call via x402.
`arxiv__search`read-only	Search arXiv by keywords, title, author and/or category; sort by relevance or newest. Costs $0.002 USDC per call via x402.
`crossref__doi`read-only	Title, authors, journal, dates, references count and licence for a DOI. Free within the daily allowance, then $0.002 USDC per call via x402.
`crossref__funders`read-only	Research funders by name, with Funder Registry ids. Free within the daily allowance, then $0.002 USDC per call via x402.
`crossref__journal`read-only	Journal title, publisher and DOI counts by ISSN. Free within the daily allowance, then $0.002 USDC per call via x402.
`crossref__members`read-only	Crossref member publishers by name. Free within the daily allowance, then $0.002 USDC per call via x402.
`crossref__search`read-only	Bibliographic search across Crossref works. Free within the daily allowance, then $0.003 USDC per call via x402.
`pubmed__clinical-trials-search`read-only	PubMed citations that are clinical trial reports for a query. A few free samples a day, then $0.002 USDC per call via x402.
`pubmed__pmc-search`read-only	Free full-text article ids in PubMed Central. A few free samples a day, then $0.002 USDC per call via x402.
`pubmed__search`read-only	PubMed ids matching a query (supports PubMed query syntax). A few free samples a day, then $0.002 USDC per call via x402.
`pubmed__summary`read-only	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.
`ror__affiliation`read-only	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.
`ror__external-id`read-only	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.
`ror__organisation`read-only	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.
`ror__relationships`read-only	Parent, child and related organisations of a ROR record. Free within the daily allowance, then $0.001 USDC per call via x402.
`ror__search`read-only	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.
`scholarly__author`read-only	One researcher by OpenAlex id or ORCID. Free within the daily allowance, then $0.002 USDC per call via x402.
`scholarly__authors-search`read-only	Researchers by name with h-index, works and citation counts. Free within the daily allowance, then $0.002 USDC per call via x402.
`scholarly__autocomplete`read-only	Fast title autocomplete across works. Free within the daily allowance, then $0.001 USDC per call via x402.
`scholarly__citing-works`read-only	Works that cite a given OpenAlex work id. Free within the daily allowance, then $0.003 USDC per call via x402.
`scholarly__institutions-search`read-only	Universities and research institutions with output stats. Free within the daily allowance, then $0.002 USDC per call via x402.
`scholarly__sources-search`read-only	Journals and repositories with impact stats. Free within the daily allowance, then $0.002 USDC per call via x402.
`scholarly__topics-search`read-only	Research topics and fields. Free within the daily allowance, then $0.002 USDC per call via x402.
`scholarly__work`read-only	One work by OpenAlex id (W…) or "doi:10.…". Free within the daily allowance, then $0.002 USDC per call via x402.
`scholarly__works-search`read-only	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.

Schemas: list_tools.

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Official server.json

{
  "name": "si.fourzerotwo/research",
  "title": "Research papers",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://fourzerotwo.si/mcp/v/research",
      "type": "streamable-http",
      "headers": [
        {
          "name": "X-API-Key",
          "isSecret": true,
          "description": "Optional free key from https://fourzerotwo.si/free (raises the free allowance from 100 to 500 calls/day)"
        }
      ]
    }
  ],
  "version": "1.0.1",
  "websiteUrl": "https://fourzerotwo.si",
  "description": "arXiv, PubMed, Crossref and OpenAlex scholarly metadata."
}