Simplify payouts with an ACH API

Automate ACH batch payments quickly with our easy-to-use API. It’s free to use and simple to get started.

Trusted by over 10,000 companies big and small

Unlock ACH automation

Tremendous makes it easy to send ACH payments at scale. Say goodbye to cancelled checks and unnecessary paperwork.

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Test

Use our sandbox environment and mock data to develop quickly.

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Customize

Personalize mass payments with your own branding and messaging.

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Scale

Scale payments for multiple teams across your organization.

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Track

Review payment history, orders, invoices, and more in real time.

How our ACH payment API works

  1. Get sandbox API credentials

    Our sandbox is free, fully-featured, and ready for you to start building right away.

    Access our sandbox >

  2. Develop your integration

    Follow our integration guides. If you need help. Our developer support team is on standby.

    Get support >

  3. Go live

    Obtain a production API key and send your first reward in minutes.

    Get an API key >

Why our API wins

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Easy

Build an integration fast with our simple API docs.

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Secure

Our API and platform are built with security in mind.

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Reliable

Scale with confidence using our easy-to-maintain API.

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Free

Spend only what you send — no platform fees, ever.

Delight recipients with less development

Frequently asked questions