Forms API Announcement | Introducing New Rate Limits and Two New Authenticated Submission Endpoints

HubSpot Employee

What's Changing?

To improve HubSpot’s platform security and performance, we are introducing new rate limits for the current unauthenticated Form Submission endpoints (
v2 and v3) .

We are also introducing two brand-new authenticated Form Submission endpoints that will have a higher rate limit than the unauthenticated submission endpoints.

These new changes will help protect our systems and continue to support appropriate form submission volume so that HubSpot grows with our customers.

Here are more details on the changes:


What this means for developers:


  • If your application is currently using the unauthenticated (v2 or v3) Form Submission endpoints and it requires more than the proposed 50 requests per 10 seconds rate limit, we recommend migrating to the new authenticated submission endpoints which have higher rate limits.

    • Free/Starter accounts: 100requests/10seconds
    • Professional/Enterprise accounts: 150requests/10seconds
    • Accounts with the API Add On: 200requests/10seconds

  • If your application is using the Form Submission endpoints to record events like user logins on a SaaS product or regularly sync large amounts of data, both of which are not the intended use cases for the Forms Submission endpoint, we recommend migrating to the following endpoints instead:

    Use Case

    Regular data syncing

    CRM Imports API

    Doc: CRM API | Imports


    CRM Batch Update API

    Doc: CRM API | Contacts 

    Recording events (like logins)

    Tracking Code API


    Knowledge Base Article
    : Create custom events

    Note: This is a Marketing Hub Enterprise only feature.

When is this change happening? 


  1. The new rate limits for the existing unauthenticated Form Submission endpoints will be introduced on July 5th 2021, 90 days from today. The new rate limit will be 50 requests/10 second.

  2. The introduction of the two new authenticated Form Submission endpoints (v2 & v3) with a higher rate limit is effective immediately.  

    Please let us know if you have any feedback questions or by replying below.


Rahmona Henry

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