# Promptfax MCP server

Source: https://glimind.com/server/mcp-registry%2Fapp.promptfax%2Fpromptfax
Registry id: `mcp-registry/app.promptfax/promptfax`
Status: live (checked 2026-10-26T21:23:56.202Z)

## Verdict

Promptfax MCP server answered 99.97% of Glimind's liveness checks over 30 days, better than 38% of MCP servers, with 533 ms median handshake and 8 outages in 90 days. Its agent-readiness grade is A (100/100) across 8 tools, costing an agent about 2,530 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 99.97% | 38% of MCP servers |
| Median handshake latency | 533 ms | 49% of MCP servers |
| p95 handshake latency | 2880 ms | — |
| Checks in 30 days | 4,862 | — |
| Outages, 90 days | 8 | — |
| Median recovery | 3 min | — |
| Agent-readiness score | 100/100 (A) | 94% of MCP servers |
| Tools | 8 | — |
| Tool-list size for an agent | ~2,530 tokens | 49% of MCP servers |
| Days observed | 29 | — |

## Install

```json
{
  "mcpServers": {
    "promptfax-mcp-server": {
      "type": "http",
      "url": "https://promptfax.app/mcp"
    }
  }
}
```

Claude Code:

```sh
claude mcp add --transport http promptfax-mcp-server https://promptfax.app/mcp
```

## Tools (8)

- `attach_document`: Fallback/non-widget tool for binding a PromptFax document or one or more HTTPS PDF URLs into the current MCP session before requesting a quote. In ChatGPT widge
- `cancel`: Use this when you need to cancel the active PromptFax send.
- `checkout`: Fallback/non-widget tool for starting external Stripe Checkout after the user accepts a pay-per-use quote. Payment authorization is required before PromptFax ca
- `get_quote`: Fallback/non-widget tool for creating a user-reviewable pay-per-use fax quote when you have a fax number and either an MCP session, a PromptFax documentId, or o
- `get_status`: Use this when you need the latest PromptFax workflow state, quote/payment state, or fax transmission status.
- `retry_failed_fax`: Use this after a retry-eligible failed fax to queue another attempt under the existing authorization. You may supply a corrected destination.
- `send_fax`: Fallback/non-widget tool for sending after payment is authorized and the user explicitly wants to send now. In ChatGPT widget sessions, do not call this after s
- `start_session`: Use this first when a user wants to send or price a fax. PromptFax is built for irregular, pay-per-use outbound faxing: every real send requires a user-reviewed

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.