# FAQ

* **When will the previously requested API keys expire?**
  * **A:** Previously issued free API Keys will expire on **August 31st**. You can register and apply for a new API Key in our new [developer center](https://developer.unisat.io/account/login).

* **What are the differences in the API interfaces before and after the upgrade? Will the data be automatically upgraded?**
  * **A:** There are no changes to the API interfaces before and after the upgrade. The old API Key will automatically expire on August 31st. Users need to register and apply for a new API Key at [Developer Center](https://developer.unisat.io/plan)

* **Is the data structure of the new API interface consistent with the old API interface?**
  * **A:** Yes, the data structure of the new API interface is consistent with the old one.

* **What should I do if my API request limit is not sufficient? What if the rate limit is not enough? What if I exceed my plan's limit?**
  * **A:** This situation typically occurs when your current usage exceeds the limits of your monthly API Key plan. However, there's no need to worry. We offer a "**Pay as you go**" plan that allows you to acquire additional requests as needed. Additionally, we provide **Free**, **Specialist**, **Enterprise**, and **Custom API plans** that you can upgrade to according to your needs, usually with immediate effect.


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