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mintfax is a fax API that handles the infrastructure so you don’t have to deal with it directly. Send a fax with a single curl POST. Get delivery status via polling or webhooks. Handle compliance with built-in retention policies and zero-footprint mode.

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Why mintfax

  • Self-serve signup - create a sandbox account, get an API key, and send a sandbox fax in under a minute. No sales calls, no manual provisioning.
  • For agent callers - OpenAPI spec, structured error responses with action hints, and deterministic sandbox flows.
  • Compliance built in - Encryption at rest and in transit. Exportable audit log. Configurable retention. Zero-footprint mode: fax data deleted after delivery.

Quickstart

Send your first sandbox fax in 60 seconds

API Reference

Full endpoint documentation

Error Catalog

Every error code and what to do about it

Webhooks

Real-time delivery notifications

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How It Works

  1. Create an account - POST /account/register + verify email code to get your API key
  2. Send a fax - POST /fax with a file attachment queues the fax
  3. Track delivery - poll GET /fax/{id} or receive a webhook
  4. Credits - prepaid balance with hold-on-submit, capture-on-delivery, release-on-failure
A credit hold is placed when you submit a fax. If delivery succeeds, the hold is captured as a charge. If delivery permanently fails, the hold is released back to your balance. You are never charged for failed deliveries.
Last modified on July 20, 2026