Pubchem MCP Server

by mrfentmen Your server? Claim it

local only

Pubchem MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 54 installs a week from npm.

Look up chemical compound properties and synonyms from PubChem. No key required.

The linked repository no longer exists on GitHub — it was deleted or made private.

Installs per day peak 21 · avg 7 · -2% w/w

a month agotoday

Installs / week

npm · @mrfentmen/pubchem-mcp

—

Stars

on GitHub

—

Last commit

2 releases in 90 days

—

License

language unknown

This one has been quiet for a while

Quiet is not dead — but it is worth knowing when it wakes up, or when someone else takes it over. We watch the repository and tell you either way.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add pubchem-mcp -- npx -y @mrfentmen/pubchem-mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "pubchem-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/pubchem-mcp"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.pubchem-mcp]
command = "npx"
args = ["-y", "@mrfentmen/pubchem-mcp"]

.cursor/mcp.json

{
  "mcpServers": {
    "pubchem-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/pubchem-mcp"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "pubchem-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/pubchem-mcp"
      ]
    }
  }
}

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Pubchem MCP — questions

Answers built from our own checks of this server.

Why is there no uptime for Pubchem MCP?

Pubchem MCP runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @mrfentmen/pubchem-mcp was installed 54 times last week.

Is Pubchem MCP still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

How do I connect Pubchem MCP?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls @mrfentmen/pubchem-mcp straight from npm; nothing to host, nothing to sign up for.

How many people use Pubchem MCP?

The npm package @mrfentmen/pubchem-mcp was installed 54 times in the last week. Week over week that is -2%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.