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PromptFax

app.promptfax/promptfax · v0.1.0

Measured by MCP Station

Description written by the publisher, not verified

Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.

Connect

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

{
  "mcpServers": {
    "promptfax": {
      "url": "https://promptfax.app/mcp"
    }
  }
}

Tools as reported by the server

• 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 quote and Stripe payment authorization before transmission. MCP clients should set hostType to identify their host: chatgpt, claude, browse
• 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 widget sessions, prefer the widget's file controls after start_session instead of calling this tool unless the widget is unavailable or the user
• 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 one or more HTTPS PDF URLs. A quote is required before Stripe Checkout and before any real fax transmission. In ChatGPT widget sessions, do n
• 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 can send; PromptFax treats webhook-confirmed authorization, not browser redirect, as payment truth. In ChatGPT widget sessions, do not call th
• send_fax write/delete
  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 start_session unless the widget is unavailable or the user explicitly asks for fallback behavior.
• 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.
• cancel write/delete
  Use this when you need to cancel the active PromptFax send.

JSON · Text for agents · Registry updated 2026-05-30