ActionTag is an easy way to embed forms on any site. Embeddable on any page on the web, it will:

Make an API call to retrieve that form’s definition (aka which fields should display)
Render a fully functional form to the screen
Pre-fill that form under
Handle submission of that form back to the server
Deal with behaviors that occur after submission such as:
- Displaying another form (secondary ask, or daisy-chaining)
- Showing a thank you message
- Redirect to another URL

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Are you looking for the Online Forms API endpoint?
ActionTag is a simple and robust way to embed your forms but we also have an Online Forms endpoint available along with Zapier and other options.