Your agent can send a fax. Now it can prove it.
A fax API, a hosted MCP server and SDKs for AI agents. Your agent sends and receives inside the permissions and the budget you set, at $0.039 a page sent. A person with one fax pays $2.49 by card.
For developers and AI agents
I am building with the API
$0.039 per page sent, from a prepaid wallet. A REST API, a hosted MCP server and SDKs. The sandbox is free.
For one fax
I have one fax to send
$2.49 for up to 5 pages to the United States and Canada. No subscription and no balance to top up. Your card is charged only when the fax is delivered.
How a job runs
Your agent prepares, quotes, gets approval, sends, receives and reconciles, inside the permissions and the budget you set. Every job ends with a record you can check.
- 01 / Prepare
Upload a PDF or an image, or post text, Markdown or HTML. The API renders and validates it and records its sha256.
- 02 / Quote
A price before the send, from a versioned rate table. The quote binds the document, the destination, the sender and the amount for ten minutes.
- 03 / Approve
A person approves that exact send, or a delegated policy written in advance allows it. Any change to the document invalidates the approval.
- 04 / Send
Bounded retries on busy and no answer. A circuit breaker per route. The wallet holds the amount until the outcome is known.
- 05 / Receive
A private inbox behind signed URLs. The text of a received fax is listed as untrusted data on every result.
- 06 / Reconcile
Six states: queued, active, partial, failed, unknown, delivered. The word delivered is written only with the provider's evidence on the attempt.
- Job
- fax_019a2f3b7c1d7a2e9f00c4b2d7e8a1f6
- To
- +1 415 555 0142
- From
- +1 628 555 0199
- Pages
- 3 of 3
- Provider ref
- TX-88f2a1
- Document sha256
- 9b1c4e2a...
- Amount captured
- $0.117
- Timestamp
- 2026-10-28 14:02:31 UTC
Built for agents
- A hosted MCP server with 17 tools at
https://mcp.faxforagents.com/mcp/, and a REST API athttps://api.faxforagents.com/v1. - Approvals and budgets are evaluated on the server, never from prompt text. An agent cannot widen its own permissions.
- Signed webhooks with event ids. An
Idempotency-Keyon every mutating call, so a retry returns the same job. - The sandbox is free. Every outcome, from delivered to unknown, can be rehearsed with a test API key before real money moves.
- Documents are private, kept 30 days by default, processed in the EU, and deletable by the owner.
How the authorization model works and what the MCP server exposes.
Connect your assistant in one paste
Paste one line into ChatGPT, Claude, a coding agent or a framework. Your assistant reads a page written for assistants, connects to the hosted server and sends a first fax in the free sandbox. No key to copy.
Read https://faxforagents.com/setup.md and set up Fax for Agents for me. Start in Sandbox.Prices
- $0.039per page sent
- $0.019per page received
- $2per number per month
- OptionalAgent workspace, $19 per month
Prepaid wallet, $10 minimum top-up. United States and Canada prices as of 2026-10-28. International rates are in the rate table. The sandbox is free.
One fax without the wallet is $2.49 by card for up to 5 pages to the United States and Canada, as of 2026-11-12. The pricing page compares the two.
What this is not
Not a HIPAA service. Protected health information is out of scope and the acceptable use policy says so.
Not a fax inbox for people. A person can send a fax online, one at a time and with no subscription. Everything else is an API, an MCP server and SDKs for software.
Not every format. PDF, PNG, JPG and TIFF uploads, and text, Markdown and HTML rendered to PDF. No office formats.
Not every country. Inbound numbers in the United States and Canada at launch. International send rates are listed on the coverage page and a country is marked verified only after a real fax reached it.