io.github.dudman1/mercury402-mcp
Mercury402: Treasury/FRED financial data over x402
Is the Mercury402 MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-26.
Treasury/FRED financial data over x402: pay-per-call US yields, macro and forex in USDC on Base
alive probed 2026-11-15 · unchanged since 2026-10-26 · HTTP 200
- Endpoint
- https://mcp.mercury402.com/mcp (streamable-http)
- Host
- mcp.mercury402.com
- Protocol
- 2025-11-25
- Reports itself as
- mercury402 0.1.3
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 765 tokens in Claude Opus 5.5, exact, measured 2026-10-26. With the Claude Code prefix mcp__…__ on each tool name: 791. The o200k_base estimate is 449. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/dudman1/mercury402
- Website
- https://mercury402.com
- Registry
- active, updated 2026-10-26 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.70×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| get_endpoint_data | 516 | 303 | 67 % |
| list_endpoints | 249 | 146 | 33 % |
Compare this server with others.
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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.