There's a new version of the HubSpot API
As of November 30, 2022, HubSpot API keys are no longer a supported authentication method for accessing HubSpot APIs. Instead, you should use a private app access token or OAuth to authenticate API calls. Learn more about this change and how to migrate an API key integration to use a private app instead.
Below you can find documentation for some of the tools you'll find in your HubSpot developer account. (Don't have a developer account yet? Get one here.)
For more general questions about HubSpot's APIs, see the API Overview and our FAQ list.