API V3 is no longer in active development. V4 is now available via an open beta, with documentation for this found here

This documentation provides details for interfacing with Kit’s API V3. All API calls are relative to the base URL: https://api.convertkit.com/v3/.

For technical support with this legacy API, please contact Kit’s support team.

API V3 is no longer in active development. V4 is now available via an open beta, with documentation for this found here

This documentation provides details for interfacing with Kit’s API V3. All API calls are relative to the base URL: https://api.convertkit.com/v3/.

For technical support with this legacy API, please contact Kit’s support team.