# Important for Polygon module

Adding RPCs : You can get a free RPC [here](https://www.alchemy.com/) for free There is also one: <https://polygon-rpc.com/>

Adding RPC and API key in settings : RPC insert any of the above, API key take [here](https://www.alchemy.com/)\
![](https://788737236-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FV5oxHMkkXARv6Kg798Uu%2Fuploads%2FOpU2utVs3nDxeAZzSVMj%2Fimage.png?alt=media\&token=370cb250-b81f-43b6-b436-6d2de9306c38)![](https://788737236-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FV5oxHMkkXARv6Kg798Uu%2Fuploads%2FYiNyBjTbwEbC1FtxxTLH%2Fimage.png?alt=media\&token=f34dc75e-398b-49be-859f-d17a447d84b4)

Gas Amount for the contract : Take a mint contract -> Look for a WL transaction -> See what Gas Limit (As shown in the picture below)\
![](https://788737236-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FV5oxHMkkXARv6Kg798Uu%2Fuploads%2FbyQ1iLDCPgXR4kHxR9ds%2Fimage.png?alt=media\&token=0e901435-f6d2-4614-a748-799a33eb5fd6)