> For the complete documentation index, see [llms.txt](https://docs.emsigner.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emsigner.com/apis/api-reference/environments-and-testing.md).

# Environments & testing

| Environment    | Base URL                                                                         |
| -------------- | -------------------------------------------------------------------------------- |
| Demo / Sandbox | `https://demoapi-core.emsigner.com`                                              |
| Custom         | Any emSigner environment you have access to (production, regional or on‑premise) |

Use the server selector in the **Test it** panel to choose the environment. Pick **Custom environment** and enter your base URL to send requests to your own instance.