io.github.mrfentmen/bitflyer-mcp

bitflyer-mcp

Is the io.github.mrfentmen/bitflyer-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-27.

BitFlyer Japan crypto exchange: tickers, order books, and markets. No key required.

alive probed 2026-11-14 · unchanged since 2026-10-27

3tools

343tokens in Claude Opus 5.5

0.2 %of Claude's 200k window

0.1×the median server

300 msto initialize

6 msto list tools

Run it: npx -y bitflyer-mcp@1.0.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: bitflyer-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 343 tokens in Claude Opus 5.5, exact, measured 2026-10-27. With the Claude Code prefix mcp__…__ on each tool name: 385. The o200k_base estimate is 181. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/bitflyer-mcp
Registry: active, updated 2026-09-21 · registry entry
Changes: 2 recorded, reachable in 2 of them. A row is added when the result, the tool count or the cost changes.

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.90×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
board	140	74	41 %
ticker	117	62	34 %
markets	85	45	25 %

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

Servers that mention exchange or required.

We add a row when the result changes. A server with no change keeps its last row.

Probed	Result	Init	Tools	Claude	o200k
2026-10-27 06:56	alive	307 ms	3	343	181
2026-10-20 06:44	alive	300 ms	3		181

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.