We are excited to announce that we have increased the API request limits for our Premium and Pro plans, providing our valued customers with even greater flexibility and power.

Under this new arrangement, the Basic plan will continue to have a 1 request per second limit, while Premium Plan subscribers will benefit from a 3 request per second limit, and Pro Plan subscribers will enjoy a 5 request per second allowance.

We want to inform you that API 1.0 is discontinued and will no longer be supported. However, all existing API keys will continue to be valid, and you may continue using them without any interruptions to your service.

To ensure that your code runs seamlessly, we recommend that you format it according to the latest API 2.0 documentation, which can be accessed at https://isbndb.com/apidocs/v2.

Effective April 23, 2020, we will no longer be providing support for API 1.0. This means that if you are currently using an old plan that utilizes this version, you may continue to do so, but please note that we will no longer be issuing any updates or providing assistance in the event of technical difficulties.