# promptfax

> promptfax — promptfax-promptfax. Use this tool when you need to send a real fax to a US fax number from an AI assistant, solving problems such as transmitting sensitive documents like medical records or signed contracts to fax-reliant businesses or offices. It takes PDF or image inputs and outputs a delivery report, with a pay-per-use pricing model and Stripe payment authorization. Use PromptFax in contexts where a secure, one-off fax transmission is required, such as sending insurance claims or court filings.

Canonical page: https://skillsregistry.net/skills/promptfax-promptfax  
JSON: https://api.skillsregistry.net/v1/skills/promptfax-promptfax

## Description

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

## Trust

- **Trust score (0–1):** 0.30
- **Verification tier:** unverified
- **Last scanned:** 2026-09-03

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** browser-automation
- **Updated:** 2026-09-03

## Source

- **Source listing:** [Smithery](https://smithery.ai/server/promptfax/promptfax)

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "promptfax-promptfax"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/promptfax-promptfax` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/promptfax-promptfax/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt