Our eSignature API Powers Your Applications

An eSignature API designed to collect signatures and build bridges between applications with forms, documents, and workflows. OnTask API has everything you need to automate processes at your business, without the hefty price tag.

OnTask API

An Electronic Signature API that Goes the Extra Mile


Get documents signed on your website or applications with our secure, legally binding, and fully compliant eSignature integration.

Document Check

Seamlessly embed forms directly into your website or applications to collect data from employees, customers, and vendors.

Secure Documents

Generate and auto-fill documents using information that exists in connected systems or collected through forms.

OnTask Recycle

Connect it all with automated email routing, built-in reminders, and follow-ups. Powered by conditional logic.

Access Documentation Resources

We’ve got all of the API documentation you need to get started.

Demo OnTask API

A Developer-Friendly API

Secure Data
Quick Error Response

Round-the-clock infrastructure monitoring with quick responses to errors and downtime notifications.

Clear Documentation

Robust documentation with everything you need to integrate OnTask API.

Scalable API

Built to scale with your company’s changing needs, complete with easy editing and expansive features.

Backward Compatible

Backward compatibility is maintained at all times, even as new releases and updates are made.

Why OnTask API?

OnTask API is designed to save developers time, helping your applications get to market faster and allowing your team to focus on differentiating your product.

30+ Years in the Business
HIPAA, FERPA, SOC2 & ESIGN ACT 2000 Compliant
Unrivaled Support
Transparent Pricing
Proven Reliability
Quick Error Response

Want to learn more before getting started?

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Why Developers Choose
OnTask API

I think the combination of all that they bring to the table in a mature capacity is the reason to do business with them. They didn’t just invent something yesterday and hope it’s working. They have tried and true platforms and people who understand the business and how to make things work.

John McGowan
CEO of HubSync

Get Your API Key and Start Testing

  1. Signup for a free trial
  2. Verify your email
  3. Receive your API key and start testing


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Get the Resources You Need to Start Integrating

Full documentation to make getting started easy.

About Authentication Tokens:

Generate an Access Token

  1. Log in to your OnTask account by visiting https://app.ontask.io/login.
  2. Click Organization Settings.
  3. In the left sidebar, select the group to which you want to create an access token for.
  4. Expand the ACCESS TOKENS section.
  5. Choose a name for this API connection.
  6. Choose the permission level for this token. Required token permissions are listed for each API route below.
  8. Copy the token to your clipboard by clicking the copy icon or use shortcut keys on your keyboard.
  9. OnTask expects for the group access token to be included in all API requests to the server in a header that looks like the following:


OnTask Group Access Token

Learn More About OnTask API

Get the most from your applications with OnTask API. Learn about benefits, functionality, and more with this fact sheet.

A Powerful eSignature API at a Fraction of the Cost

Don’t let high price tags or hefty fees scare you away from using the right eSignature API for your applications. OnTask API integrates eSignatures and automates forms and documents at a fraction of the cost of our competitors.

OnTask API
No Hidden Fees

What you see is what you get. All features included in your desired pricing tier are available to you, without yearly price increases or hidden fees.

Flexible Options

All pricing tiers feature everything needed to build eSignature and form functionality into applications, with options for added support and functionality.