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Integrate with Gusto via API

About Gusto

Gusto is an all-in-one HR platform that saves small businesses an average of five hours per month by automating and simplifying their payroll and benefits administration. Known for being refreshingly easy to use, Gusto has been rated the Best Payroll Software of 2023 by the U.S. News and World Report.

Employer Size
1-100 employees
Employer Count

Powering integrations for hundreds of platforms

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Why developers love building with Finch

Market-leading coverage

Instantly support 180+ systems (and counting) compatible with our normalized data structure and as we add new systems, turn them on with one click.

Enterprise-grade security

Trust Finch’s infrastructure that enforces TLS 1.2 for data in transit and encrypts data at rest using AES 256 bit encryption.

Read and write functionality

Seamlessly read company, census, and payroll data, while writing deductions and benefits contributions changes directly into the source of truth.

Best in class developer experience

Integrate Finch in hours with just a few lines of code and turn on the ability sync data with employers in as little as 30 seconds.

compatible systems
daily API calls
employers connected
U.S. employers covered

Unified API

One API to unite every provider

Finch standardizes employment data across every provider. So you don't have to.


What percentage of the market uses Gusto?

Given that Gusto boasts over 300,000 customers, and there were 6.1 million employers in the United States as of 2019, Gusto is estimated to serve 4.92% of the U.S. market.

How can I access the employment data in Gusto?

To access your customers’ employment data in Gusto, you have two options: 

  1. Build a custom 1:1 integration with Gusto via its external API, which enables automatic data sharing between the two apps. 
  2. Build a single integration with Finch to access the employment data housed in Gusto plus more than 200 other employment systems.

Does Gusto have a public API?

Gusto does not yet offer single company API access but does serve developers through its application integration as well as an embedded payroll solution. 

The application integration is an external API that allows you to serve mutual customers by automatically sharing data between apps. Read more here

The embedded payroll API empowers you to build payroll products tailored to your customers’ needs. Read more here

Both are gated APIs that require business development efforts.

How long does it take to integrate with Gusto?

That largely depends on the integration method you choose. 

If you use Finch’s unified API to access the employment data in Gusto (alongside over 200 other HRIS and payroll systems), it can take as little as a few days. See our quickstart guide for more information.

If you instead decide to build a 1:1 integration leveraging Gusto’s external API, it can take up to two months to receive your production keys from the time you receive your demo keys. See Gusto’s developer FAQ page for more information..

Where can I find developer documentation and support?

If you’re building a 1:1 integration using Gusto’s external API, the company’s Developer Portal is the best place to start. That’s where you can create an account, apply for API keys, see pricing details, get answers to other frequently asked questions, and access their API docs.

If you’re integrating with Gusto via Finch’s unified API, navigate to our API docs. There, you’ll find a product demo, quickstart guide for developers, integration checklist, and product and developer guides, along with best practices to follow.

Of course, if you have any questions, we’d be happy to help answer them. Send your requests to

When does it make sense to leverage a unified employment API?

Unified employment APIs help developers access data from payroll and HRIS systems employers use. Specifically, these APIs are useful for accessing data from a broad range of employment systems or collecting detailed information about their customers’ payroll and benefits. If your use case requires integrations with three or more employment systems, a unified employment API could save you hundreds of engineering hours and developer resources. 

Through a single integration, you can connect with over 200 employment systems (including Gusto)—unlocking up to 88% of the employer market. Once authorized by the employer, you’ll receive fresh data every 24 hours. From enterprise-grade security to read and write capabilities, Finch offers compelling benefits to employer-facing businesses of all shapes and sizes. Learn more

Check out our API docs for more info

Customer Stories

You’ll be in good company

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How Rillet Stood Up 40 Payroll Integrations in Just 5 Days

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Access the global employment ecosystem

Create a best-in-class experience for your users today.

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