PromptFax MCP server

Which servers in the official MCP registry are PromptFax's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-14

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Whose server it is

Registry nameapp.promptfax/promptfaxverified in the MCP registry

The registry name sits under promptfax.app. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-14

Stateanswerschecked 2026-10-14
Tools8
Server calls itselfpromptfax-mcp
Server version20261013022507-58c7138
Protocol version2025-06-18

On 2026-10-14 the server answered initialize and tools/list without a sign-in. First answer in 76 ms.

Tools it offers8 tools · read 2026-10-14

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…
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…
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…
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…
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 start_session unless the widget is unavailable or the user explicitly asks for…
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
Use this when you need to cancel the active PromptFax send.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.