io.github.mrfentmen/pubchem-compound-mcp
pubchem-compound-mcp
Is the io.github.mrfentmen/pubchem-compound-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-09.
PubChem compounds: properties by name or CID, synonyms, and a short description - keyless.
alive probed 2026-11-15 · unchanged since 2026-11-09
- Run it
- npx -y @mrfentmen/pubchem-compound-mcp@1.0.2 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- pubchem-compound-mcp 1.0.1
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 463 tokens in Claude Opus 5.5, exact, measured 2026-11-02. With the Claude Code prefix mcp__…__ on each tool name: 511. The o200k_base estimate is 253. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/mrfentmen/awesome-servers
- Registry
- active, updated 2026-11-08 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.83×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| compound_synonyms | 179 | 98 | 39 % |
| compound_properties | 154 | 84 | 33 % |
| compound_description | 130 | 71 | 28 % |
Compare this server with others.
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Other registry entries on npmjs.com, the ones next to this name; all of them.
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- io.github.mrfentmen/pub-dev-mcp · alive
- io.github.mrfentmen/pubchem-mcp · alive
- io.github.mrfentmen/pubg-mcp · alive
- io.github.mrfentmen/public-holidays-mcp · alive
- io.github.mrfentmen/publicwww-mcp · alive
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- com.smartmoney77/financial-calculators · alive
- Compound Interesting — market intelligence ing.compoundinterest/market-intelligence · alive
- Arcadia Finance io.github.arcadia-finance/mcp-server · alive
- io.github.cyanheads/chembl-mcp-server · alive
- io.github.cyanheads/pubchem-mcp-server · alive
- io.github.junct-bot/compound-mcp · TLS error
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.