io.github.mrfentmen/mempool-mcp

mempool-mcp

Is the io.github.mrfentmen/mempool-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-09.

Bitcoin network status: recommended fees, mempool backlog, blocks, addresses, difficulty retargets.

alive probed 2026-11-14 · unchanged since 2026-11-09

6tools

703tokens in Claude Opus 5.5

0.4 %of Claude's 200k window

0.3×the median server

276 msto initialize

9 msto list tools

Run it: npx -y mempool-mcp@1.0.2 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: mempool-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 703 tokens in Claude Opus 5.5, exact, measured 2026-10-27. With the Claude Code prefix mcp__…__ on each tool name: 775. The o200k_base estimate is 363. 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, 1.94×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
block_info	157	81	22 %
address_info	139	72	20 %
recent_blocks	134	69	19 %
mempool_stats	93	48	13 %
recommended_fees	91	47	13 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention mempool.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.