# Fractal Development Support (testnet) **Fractal Testnet Developer Notices** * **Wallet Integration**: When integrating the UniSat wallet, please ensure you are using the **FRACTAL\_BITCOIN\_TESTNET** network. * **Open-API Endpoint**: The Open-API endpoint has been updated. Developers should now use the following endpoint for all API requests: * Please apply for new API Key on our developer center These updates are essential for ensuring compatibility and optimal performance during the test phase. We encourage all developers to make the necessary adjustments to their integrations. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.unisat.io/developer-support/open-api-documentation/api-for-fractal-bitcoin/fractal-development-support-testnet.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.