com.prontofax/prontofax
prontofax
Is the com.prontofax/prontofax MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-04.
Verified US government fax numbers and send a fax from the chat. No account, $2.99 on delivery.
alive probed 2026-11-15 · unchanged since 2026-11-04 · HTTP 200
- Endpoint
- https://mcp.prontofax.com/mcp (streamable-http)
- Host
- mcp.prontofax.com
- Protocol
- 2025-06-18
- Reports itself as
- prontofax 1.0.0
- Capabilities
- extensions, tools
- Instructions
- 1 110 characters
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 947 tokens in Claude Opus 5.5, exact, measured 2026-11-04. With the Claude Code prefix mcp__…__ on each tool name: 965. The o200k_base estimate is 576. Counted again when the tool definitions change. Method.
- Website
- https://www.prontofax.com/mcp/
- Registry
- active, updated 2026-11-04 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.64×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| lookup_fax_number | 536 | 326 | 57 % |
| send_fax | 411 | 250 | 43 % |
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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.