url/echo.fatstack.net/mcp
Fatstack
Is the Fatstack MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.
Marketplace of MCP servers and APIs that agents pay for per call in USDC over x402 on Base.
alive probed 2026-11-14 · HTTP 200
- Endpoint
- https://echo.fatstack.net/mcp (streamable-http)
- Host
- echo.fatstack.net
- Protocol
- 2025-06-18
- Reports itself as
- fatstack-echo-json 0.1.0
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 132 tokens in Claude Opus 5.5, exact, measured 2026-10-28. With the Claude Code prefix mcp__…__ on each tool name: 140. The o200k_base estimate is 73. Counted again when the tool definitions change. Method.
- Website
- https://www.fatstack.net
- Registry
- Not in the official registry. Listed in awesome-remote-mcp-servers, so the daily probe measures it with the registry servers. Publish it and it gets its registry name here.
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.81×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| echo_json | 132 | 73 | 100 % |
Compare this server with others.
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- Epinu ai.epinu/epinu · alive
- Glasser ai.glasser/glasser · needs auth
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.
Fixed something? Probe it now, with the same steps as the daily run. This page updates with the next daily run.