# SendaFax.ai — full notes for language models

How to send a fax from Claude, ChatGPT, or a browser. Pay only if it delivers.

## Product

SendaFax.ai is a pay-on-delivery fax sender. Use it to send a fax or send a fax in Australia to a +61 number. There is no SMS verification and no card at send. You pay only if it delivers. A person or an agent authenticates with Google or Microsoft (email is the account). They submit one document to one Australian fax number. SendaFax hands last-mile delivery to Notifyre. If Notifyre reports delivery, SendaFax creates a USD invoice and emails a same-minute receipt. The account cannot send another fax until that invoice is paid. Day-3 and day-7 reminder emails follow if the invoice stays unpaid. If the fax fails, there is no invoice.

## What this is not

- Not HIPAA-certified
- Not inbound fax as a product
- Not a clinic inbox
- Not a blast / broadcast tool
- Public pages must not list clinic phone numbers

## Destinations

Only Australia. Accept +61, 61, or national 0-prefix numbers and normalize to E.164 +61. Any other country code must fail with a clear error: SendaFax only delivers to Australian (+61) fax numbers.

## Pricing

- per_page: USD $1.00 per declared page
- pack_50: USD $10.00 per 50-page block (ceil(pages/50) * $10)
- Currency is USD
- Charge only after delivery

## Identity and lock

- No card is collected at send time
- Sign-in: Google OAuth and Microsoft Entra ID / Microsoft account
- Optional Bearer token created after sign-in for MCP and REST agents
- Next fax locked while an invoice is unpaid
- One in-flight fax at a time

## Surfaces

- Web send form: https://sendafax.ai/send
- REST: POST https://sendafax.ai/api/faxes
- Status: GET https://sendafax.ai/api/faxes/{id} and POST https://sendafax.ai/api/faxes/{id}/refresh
- Pay: POST https://sendafax.ai/api/invoices/{id}/pay
- Hosted MCP JSON-RPC: POST https://sendafax.ai/api/mcp
- MCP discovery: https://sendafax.ai/.well-known/mcp.json
- OpenAPI: https://sendafax.ai/openapi.yaml

## MCP tools

### send_fax

Destructive. Do not invent a destination. There is no default destination. Required: destination (+61), pages, and body (or document_base64). Optional pricing_plan: per_page | pack_50.

### get_fax_status

Required: fax_id. Refreshes last-mile status. Invoice appears only after delivery.

## Environment (operators)

- NOTIFYRE_API_KEY — Notifyre token, never committed
- CARRIER_MODE=sandbox|live
- APP_URL
- SESSION_SECRET
- DATABASE_URL (Postgres on Vercel; SQLite locally)

## Source of truth

This Origin repository is the product source of truth. Vercel deploys main to https://sendafax.ai. HostGator is DNS only — do not buy HostGator hosting.