The HubSpot public endpoints are powered by the same underlying technology as the core HubSpot application. As a result, HubSpot engineering closely monitors usage of the public APIs to ensure a quality experience for users.

Below, you'll find the limits by which a single integration (as identified by an access token) can consume the HubSpot public APIs. If you have any questions, please post them in the developer forum.

• All integrations must comply with the HubSpot Acceptable Use Policy and API Terms. 
• HubSpot has the following limits in place for API requests:
  • Integrations using API keys are subject to the daily limits below. Daily limits reset at midnight based on the HubSpot account's time zone setting.
    

    Product tier	Limits
    Free & Starter	Burst: 100/10 seconds Daily: 250,000
    Professional & Enterprise	Burst: 150/10 seconds Daily: 500,000
    API add-on (any tier)	Burst: 200/10 seconds Daily: 1,000,000

  • Integrations using OAuth are only subject to the limit of 100 requests per 10 seconds. The limits related to the API add-on don't apply to integrations using OAuth.
• Integrations exceeding their limits will receive error responses with a 429 response code. Please see this page for more details about those errors, and suggestions for working with the request limits.
  • Learn more about about our service limits.
• Integrations that poll HubSpot for new or updated information are limited to polling for those changes at intervals of five minutes or more.
• Requests resulting in an error response may not exceed 5% of your total requests. If you plan on listing your app in our App Marketplace, it must stay under this 5% limit to be certified.
• Integrations should use HubSpot's OAuth protocol.
• Integrators must store time-to-live (TTL) data for OAuth access tokens, which will be returned to you in an expires_in parameter whenever you generate an access token. Unauthorized (401) requests are not a valid indicator that a new access token must be retrieved.
• Integrators should use their own public and documented APIs when working with the HubSpot APIs.
• We reserve the right to change or deprecate the APIs over time - we will provide developers ample notification in those cases. These notifications will be provided through our developer changelog.
• You may create no more than 100 applications per developer account.
• You may create no more than 1000 webhook subscription per application.
• You may create no more than 25 CRM Extension settings per application.
• You may create no more than 750 Timeline Event Types per application.
• You may create no more than 500 properties per Timeline Event Type.