SERVER

promptfax

Rank #107,271

smithery/promptfax/promptfax

PromptFax is a pay-per-use remote MCP server that lets an AI assistant send a real fax to a US fax number. Your assistant uploads a PDF or image, enters the destination, reviews a quote, opens Stripe Checkout, and queues the transmission. Pricing is $2.00 for the first 5 pages, then $0.10 per page after that, capped at $4.50 for up to 35 pages. Payment is captured only after the fax is recorded as delivered. There is no PromptFax account, no subscription, and no API key to manage. PromptFax uses OAuth and Streamable HTTP, so users install once and their assistant can start a fax workflow when needed. Inside ChatGPT, PromptFax opens a connector widget that handles document review, destination entry, Stripe Checkout, and the delivery report. Inside Claude or other MCP hosts, PromptFax falls back to an agent-friendly hosted session page that handles the same flow without requiring the host to pass files directly. Every real send requires a user-reviewed quote and Stripe authorization. The assistant cannot silently complete a fax. The `send_fax` and `cancel` tools are marked as destructive so well-behaved MCP hosts can surface confirmation steps. ## Capabilities - Send outbound faxes to US fax numbers - Attach a PDF or image from the host, widget, hosted session page, or HTTPS URL - Generate a pay-per-use quote before payment - Open Stripe Checkout for payment authorization - Queue a paid fax for transmission - Check workflow, payment, and delivery status - Retry eligible failed faxes - Cancel an active send while cancellation is still possible ## Tools - `start_session` — Create or resume a PromptFax MCP session. - `attach_document` — Bind a PromptFax document or HTTPS PDF URLs to an MCP session. - `get_quote` — Create a fax quote from a session, document, or HTTPS PDF URL. - `checkout` — Open Stripe Checkout after the user accepts a quote. - `send_fax` — Queue a paid fax for transmission. - `get_status` — Fetch workflow, payment, and transmission status. - `retry_failed_fax` — Prepare a retry flow after a retry-eligible failed fax. - `cancel` — Cancel the active send while cancellation is still possible. ## Common use cases - Sending a one-off medical record, referral, or intake form to a clinic's fax line. - Returning a signed contract to a small business or law office that still operates by fax. - Sending insurance claim forms, prior-authorization paperwork, or appeal letters. - Sending a benefits or HR form to a payroll vendor that requires fax submission. - Sending court filings or notarized documents to a filing office. ## Data handling PromptFax does not require an email address, does not provision a PromptFax account, and stores uploaded documents only as long as the fax workflow needs them. Server-side working copies are deleted after transmission. The browser-local delivery report persists for up to 24 hours unless cleared sooner. PromptFax is outbound-only and currently supports US fax numbers only. Payments are processed by Stripe for Cogint Labs LLC. ## Links - Homepage: https://promptfax.app/ - MCP endpoint: https://promptfax.app/mcp - Setup docs: https://promptfax.app/mcp-setup - Tool catalog: https://promptfax.app/mcp-tools - Demo: https://promptfax.app/mcp-demo - Pricing: https://promptfax.app/pricing - Privacy: https://promptfax.app/privacy - Terms: https://promptfax.app/terms

Not versioned

Claim this server

First listed

May 31, 2026

Last publish date

—

OVERVIEW

promptfax is a Model Context Protocol (MCP) server. It ranks #107,271 of 137,492 servers tracked on MCP Toplist. promptfax is listed on Smithery, and ships as a single rolling release with no explicit version metadata. It was first listed on May 31, 2026.

STANDING

#107,271of 137,492 tracked servers

Ranks ahead of 30,221 of 137,492 servers on MCP Toplist.

CONNECT

Use promptfax

Remote authHosted remote, sign-in required

Hosted remote endpoint gated by authentication — connect via its URL and authenticate with the provider (OAuth flow or an API key/header, per its docs).

Remote · HTTP

claude mcp add --transport http promptfax https://server.smithery.ai/promptfax/promptfax/mcp

This endpoint requires authentication — see the server’s docs for credentials.

Remote · HTTP

[mcp_servers.promptfax]
url = "https://server.smithery.ai/promptfax/promptfax/mcp"

Add to ~/.codex/config.toml. This endpoint requires authentication — see the server’s docs for credentials.

Remote · HTTP

https://server.smithery.ai/promptfax/promptfax/mcp

Settings → Connectors → “Add custom connector”, then paste this URL. This endpoint requires authentication — see the server’s docs for credentials.

Remote · HTTP

{
  "mcpServers": {
    "promptfax": {
      "url": "https://server.smithery.ai/promptfax/promptfax/mcp"
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). This endpoint requires authentication — see the server’s docs for credentials.

Remote · HTTP

{
  "servers": {
    "promptfax": {
      "type": "http",
      "url": "https://server.smithery.ai/promptfax/promptfax/mcp"
    }
  }
}

Save as .vscode/mcp.json in your workspace. This endpoint requires authentication — see the server’s docs for credentials.

Remote · HTTP

{
  "mcpServers": {
    "promptfax": {
      "serverUrl": "https://server.smithery.ai/promptfax/promptfax/mcp"
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. This endpoint requires authentication — see the server’s docs for credentials.

Remote · HTTP

{
  "mcpServers": {
    "promptfax": {
      "url": "https://server.smithery.ai/promptfax/promptfax/mcp"
    }
  }
}

This endpoint requires authentication — see the server’s docs for credentials.

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Markdown

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REGISTRIES

Listed on 1 registry

Smithery

VERSIONS

Not versioned

This server is published through a registry that does not expose explicit version metadata, and no GitHub release tags were found on the linked repository. The listing tracks a single rolling release.

FAQ

Frequently asked questions

Is promptfax listed on the Official MCP Registry?: promptfax is not on the Official MCP Registry. It is listed on Smithery.
How many versions does promptfax have?: promptfax ships as a single rolling release with no explicit version metadata.

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