SERVER

crossref-mcp-server

Rank #3,545

io.github.cyanheads/crossref-mcp-server

Resolve DOIs, search ~155M scholarly works, and fetch references via the Crossref REST API.

32 versions

3 GitHub stars

by cyanheads (165 servers)View repository ↗

First listed

May 23, 2026

Last publish date

Oct 8, 2026

PURPOSE

What you can do with crossref-mcp-server

crossref-mcp-server is a Model Context Protocol (MCP) server published by cyanheads. It ranks #3,545 of 151,203 active servers on MCP Toplist, and its repository has 3 GitHub stars. crossref-mcp-server is listed across 3 registries — Official MCP, PulseMCP and Glama, with 32 tracked versions. It was first listed on May 23, 2026 and most recently updated on Oct 8, 2026.

Not verifiedMCP Toplist has not yet written a checked profile for this server, so the paragraph above is assembled from registry data only. The repository README is the authority on what it does.

CAPABILITIES AND LIMITATIONS

What crossref-mcp-server can and cannot do

Not verifiedMCP Toplist has not catalogued this server's tools or limitations. The repository README lists them.

REQUIREMENTS

What you need before using crossref-mcp-server

DeclaredNo credentialsNo credentials declared

The registry listing declares no required environment variables or authentication. This is declared metadata, not a verified install — the repository README is the authority.

MCP Toplist probed the public endpoint on Oct 22, 2026 and could not complete the MCP handshake (jsonrpc error). Requirements remain unverified.

Declared by Glama, last synced Oct 23, 2026. Not independently verified by MCP Toplist.

Declared in the registry install config

CROSSREF_MAILTO · optional
CROSSREF_BASE_URL · optional
CROSSREF_TIMEOUT_MS · optional
MCP_LOG_LEVEL · optional
MCP_TRANSPORT_TYPE · optional
MCP_HTTP_HOST · optional
MCP_HTTP_PORT · optional
MCP_HTTP_ENDPOINT_PATH · optional
MCP_AUTH_MODE · optional

Hosted endpoint declared as public.

INSTALLATION AND FIRST TASK

Connect crossref-mcp-server and confirm it works

Remote · HTTP

claude mcp add --transport http crossref-mcp-server https://crossref.caseyjhand.com/mcp

npm package

claude mcp add crossref-mcp-server -e "CROSSREF_MAILTO=<your CROSSREF_MAILTO>" -e "CROSSREF_BASE_URL=<your CROSSREF_BASE_URL>" -e "CROSSREF_TIMEOUT_MS=<your CROSSREF_TIMEOUT_MS>" -e "MCP_LOG_LEVEL=<your MCP_LOG_LEVEL>" -- npx -y @cyanheads/crossref-mcp-server

Replace each placeholder with your own value before saving.

npm package

claude mcp add crossref-mcp-server -e "MCP_TRANSPORT_TYPE=<your MCP_TRANSPORT_TYPE>" -e "CROSSREF_MAILTO=<your CROSSREF_MAILTO>" -e "CROSSREF_BASE_URL=<your CROSSREF_BASE_URL>" -e "CROSSREF_TIMEOUT_MS=<your CROSSREF_TIMEOUT_MS>" -e "MCP_HTTP_HOST=<your MCP_HTTP_HOST>" -e "MCP_HTTP_PORT=<your MCP_HTTP_PORT>" -e "MCP_HTTP_ENDPOINT_PATH=<your MCP_HTTP_ENDPOINT_PATH>" -e "MCP_AUTH_MODE=<your MCP_AUTH_MODE>" -e "MCP_LOG_LEVEL=<your MCP_LOG_LEVEL>" -- npx -y @cyanheads/crossref-mcp-server

Replace each placeholder with your own value before saving.

Remote · HTTP

[mcp_servers.crossref-mcp-server]
url = "https://crossref.caseyjhand.com/mcp"

Add to ~/.codex/config.toml.

npm package

[mcp_servers.crossref-mcp-server]
command = "npx"
args = ["-y", "@cyanheads/crossref-mcp-server"]

[mcp_servers.crossref-mcp-server.env]
CROSSREF_MAILTO = "<your CROSSREF_MAILTO>"
CROSSREF_BASE_URL = "<your CROSSREF_BASE_URL>"
CROSSREF_TIMEOUT_MS = "<your CROSSREF_TIMEOUT_MS>"
MCP_LOG_LEVEL = "<your MCP_LOG_LEVEL>"

Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.

npm package

[mcp_servers.crossref-mcp-server]
command = "npx"
args = ["-y", "@cyanheads/crossref-mcp-server"]

[mcp_servers.crossref-mcp-server.env]
MCP_TRANSPORT_TYPE = "<your MCP_TRANSPORT_TYPE>"
CROSSREF_MAILTO = "<your CROSSREF_MAILTO>"
CROSSREF_BASE_URL = "<your CROSSREF_BASE_URL>"
CROSSREF_TIMEOUT_MS = "<your CROSSREF_TIMEOUT_MS>"
MCP_HTTP_HOST = "<your MCP_HTTP_HOST>"
MCP_HTTP_PORT = "<your MCP_HTTP_PORT>"
MCP_HTTP_ENDPOINT_PATH = "<your MCP_HTTP_ENDPOINT_PATH>"
MCP_AUTH_MODE = "<your MCP_AUTH_MODE>"
MCP_LOG_LEVEL = "<your MCP_LOG_LEVEL>"

Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.

Remote · HTTP

https://crossref.caseyjhand.com/mcp

Settings → Connectors → “Add custom connector”, then paste this URL.

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "MCP_TRANSPORT_TYPE": "<your MCP_TRANSPORT_TYPE>",
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "mcpServers": {
    "crossref-mcp-server": {
      "url": "https://crossref.caseyjhand.com/mcp"
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project).

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "MCP_TRANSPORT_TYPE": "<your MCP_TRANSPORT_TYPE>",
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "servers": {
    "crossref-mcp-server": {
      "type": "http",
      "url": "https://crossref.caseyjhand.com/mcp"
    }
  }
}

Save as .vscode/mcp.json in your workspace.

npm package

{
  "servers": {
    "crossref-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.

npm package

{
  "servers": {
    "crossref-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "MCP_TRANSPORT_TYPE": "<your MCP_TRANSPORT_TYPE>",
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "mcpServers": {
    "crossref-mcp-server": {
      "serverUrl": "https://crossref.caseyjhand.com/mcp"
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "MCP_TRANSPORT_TYPE": "<your MCP_TRANSPORT_TYPE>",
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.

Remote · HTTP

{
  "mcpServers": {
    "crossref-mcp-server": {
      "url": "https://crossref.caseyjhand.com/mcp"
    }
  }
}

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "crossref-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/crossref-mcp-server"
      ],
      "env": {
        "MCP_TRANSPORT_TYPE": "<your MCP_TRANSPORT_TYPE>",
        "CROSSREF_MAILTO": "<your CROSSREF_MAILTO>",
        "CROSSREF_BASE_URL": "<your CROSSREF_BASE_URL>",
        "CROSSREF_TIMEOUT_MS": "<your CROSSREF_TIMEOUT_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>"
      }
    }
  }
}

Replace each placeholder with your own value before saving.

First successful task

After adding the config, ask your client to list this server's tools. A tool list confirms the connection; an empty list or an error means the server did not start or needs credentials.

ALTERNATIVES

When to choose another server

Other servers by cyanheads

View all cyanheads servers →

No task-specific alternatives are catalogued for crossref-mcp-serveryet; the list above is its publisher's other servers.

MAINTENANCE AND EVIDENCE

What changed, and when this was checked

First listed: May 23, 2026
Latest version published: Oct 8, 2026
Version history: 32 versions tracked (below)
Requirements evidence: MCP Toplist probed the public endpoint on Oct 22, 2026 and could not complete the MCP handshake (jsonrpc error). Requirements remain unverified.
Profile checked: Not yet — purpose, capabilities and requirements above come from registry data only
Ranking data as of: Oct 23, 2026

Registry sightings

Official MCP ↗listed since May 24, 2026 · still listed
PulseMCP ↗listed since Jun 4, 2026 · still listed
Glama ↗listed since Jul 30, 2026 · still listed

Do you maintain crossref-mcp-server? to correct or enrich this profile.

VERSIONS

Available versions (32)

Version	Published
0.4.2	Oct 8, 2026
0.4.1	Sep 24, 2026
0.4.0	Sep 24, 2026
0.3.13	Sep 19, 2026
0.3.12	Sep 13, 2026
0.3.11	Aug 25, 2026
0.3.10	Aug 25, 2026
0.3.9	Aug 10, 2026
0.3.8	Aug 10, 2026
0.3.7	Aug 10, 2026
0.3.6	Aug 10, 2026
0.3.5	Aug 9, 2026
0.3.4	Aug 9, 2026
0.3.3	Aug 7, 2026
0.3.2	Aug 7, 2026
0.3.1	Aug 7, 2026
0.3.0	Aug 7, 2026
0.2.1	Aug 7, 2026
0.2.0	Jul 13, 2026
0.1.17	Jul 13, 2026
0.1.16	Jun 20, 2026
0.1.15	Jun 16, 2026
0.1.14	Jun 12, 2026
0.1.13	Jun 4, 2026
0.1.12	Jun 2, 2026
0.1.11	Jun 1, 2026
0.1.10	May 30, 2026
0.1.9	May 29, 2026
0.1.8	May 24, 2026
0.1.7	May 24, 2026
0.1.6	May 23, 2026
0.1.5	May 23, 2026

STANDING

#3,545of 151,203 active serversTop 5%

Ranks ahead of 147,658 of 151,203 servers on MCP Toplist.

BADGE

Show your rank

Maintain this server? Add the live rank badge to your README — it updates automatically as the leaderboard changes.

Markdown

[![MCP Toplist](https://mcptoplist.com/badge/io.github.cyanheads%2Fcrossref-mcp-server.svg)](https://mcptoplist.com/server/io.github.cyanheads%2Fcrossref-mcp-server)

HTML

<a href="https://mcptoplist.com/server/io.github.cyanheads%2Fcrossref-mcp-server"><img src="https://mcptoplist.com/badge/io.github.cyanheads%2Fcrossref-mcp-server.svg" alt="MCP Toplist: Top 5% of 151,203" /></a>

Variants: append ?metric=score or ?metric=stars to the image URL.

FAQ

Frequently asked questions

Who maintains crossref-mcp-server?: crossref-mcp-server is maintained by cyanheads, which publishes 165 MCP servers (2813 total versions) tracked on MCP Toplist.
Is crossref-mcp-server listed on the Official MCP Registry?: Yes — crossref-mcp-server is listed on the Official MCP Registry, alongside PulseMCP and Glama.
How many versions does crossref-mcp-server have?: MCP Toplist tracks 32 versions of crossref-mcp-server, most recently published on Oct 8, 2026.
Where can I find the source code for crossref-mcp-server?: The source code for crossref-mcp-server is hosted at github.com/cyanheads/crossref-mcp-server.

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