LocalFree

Pubchem MCP server

mrfentmen/pubchem-mcp

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

Source code

Install Pubchem in Claude Code

Claude Code
claude mcp add mrfentmen-pubchem -- npx -y @mrfentmen/pubchem-mcp
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "mrfentmen-pubchem": {
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/pubchem-mcp"
      ]
    }
  }
}

Frequently asked questions

What does the Pubchem MCP server do?

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

Is the Pubchem MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Pubchem run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Pubchem to Claude Code?

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

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