# 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.


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