Fax API for startups

If a customer needs your application to send faxes, mintfax provides an API you can test before paying for live delivery. You do not need a fax machine or a dedicated fax number.

Test the awkward parts

The free sandbox uses the same endpoints, request formats, and webhook events as live. Test numbers let you check how your application handles delivery, busy lines, invalid numbers, and other outcomes.

Sandbox faxes are simulated and never reach a real recipient. You can register and start testing without a credit card.

When you are ready to send real faxes, buy credits and use a live API key. The quickstart explains registration and your first request.

Pay for the pages you send

The standard rate is $0.060 per page, with lower rates at 100,000 and one million pages per month. You buy credits in advance. mintfax reserves credits when you submit a fax and charges them when delivery succeeds. A failed delivery releases the reserved credits.

There are no setup fees, monthly minimums, or charges per user. All features are included at every price tier. See pricing for rates and billing details.

Prepare for a customer’s data review

You can review and sign a Business Associate Agreement (BAA) or Data Processing Agreement (DPA) in the dashboard. The signed PDF is available to download immediately.

Fax content is encrypted in storage. You can choose how long to keep it, delete individual faxes’ content, and export your audit log. The compliance page explains these controls and their limits.

Get started

Try the sandbox, or follow the quickstart to send a simulated fax.