> For the complete documentation index, see [llms.txt](https://circular-protocol.gitbook.io/standard-apis/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://circular-protocol.gitbook.io/standard-apis/api-docs/typescript/setnagkey-and-setnagurl.md).

# SetNAGKey & SetNAGURL

Once the library is correctly included, it's the time to set the URL and key of the NAG (Network Access Gateway) used to interact with Circular.

```typescript
Circular.SetNAGKey([your key]);
Circular.SetNAGURL([NAG URL]);
```

You can locate the URLs for native NAGs in our SDK documentation. As for third-party NAGs, we plan to provide a list in the future. If you're planning to use the SandBox blockchain for testing purposes, feel free to use an empty ("") NAG key.