# SendFax.sh

**Send faxes with your agent. One API call, paid per page.**

SendFax.sh sends real faxes over HTTP. Agents pay per request with x402 or MPP
(USDC) -- no account, no API key. Humans can drag a PDF in and pay with Stripe.
Either way it's real-time: the document is streamed to the carrier and deleted
after sending. We never store your fax.

## For agents

Send a fax in four steps (full detail in
[quickstart.md](https://sendfax.sh/quickstart.md)):

1. `POST https://sendfax.sh/api/v1/faxes` -- multipart with `document` (a PDF)
   and `to` (an E.164 fax number).
2. You get **HTTP 402** with payment requirements ($0.05/page, USDC). Pay with
   any x402- or MPP-capable client and retry with the payment header.
3. Response: `{ "id": "...", "statusUrl": "https://sendfax.sh/f/{id}" }`.
4. Poll `GET https://sendfax.sh/api/v1/faxes/{id}` until `delivered` or
   `failed`.

Docs: [llms.txt](https://sendfax.sh/llms.txt) *
[OpenAPI](https://sendfax.sh/openapi.json) *
[auth](https://sendfax.sh/auth.md) * [skill](https://sendfax.sh/SKILL.md)

## For humans

Go to [/human](https://sendfax.sh/human): drop a PDF, enter the destination fax
number, and pay with Stripe (Link, card, or crypto/USDC). You're redirected to
a live status page and shown a receipt on delivery. Prefer pure crypto? A
wallet-native x402/USDC path is offered too.

## Pricing

| Item | Price |
|------|-------|
| Per page | **$0.05** (USDC on agent rails, no minimum) |
| Human minimum | $0.50 (Stripe's minimum charge) |

Cost basis: Telnyx vendor cost (~$0.014/page all-in) plus 50% margin.

## Privacy

Real-time fax. The PDF is uploaded straight to Telnyx, sent, and deleted -- we
keep no copy. We store only process metadata (ids, statuses, page counts,
timestamps). The destination number is redacted to its last 4 digits once the
fax reaches a terminal state. No logins, no accounts, anywhere.

## Colophon

Type: **ChiKareGo2** (CC-BY, Giles Booth) for chrome and titles,
**Departure Mono** (SIL OFL 1.1) for terminal/code, **Pixelify Sans**
(SIL OFL 1.1) for display accents. Faxes delivered via Telnyx Programmable Fax.
Built on Cloudflare Workers.