TestNet tradeFee endpoint returns 404

I’m using the Binance TestNet API to debug my application, however it returns 404 when calling attempting to retrieve trade fees:

https://testnet.binance.vision/sapi/v1/asset/tradeFee

1/ Is this the correct URL?
2/ Is it by design?
3/ Is there a workaround?
4/ Are there any other actions that aren’t supported?

Thanks,
Richard

/sapi/* endpoints are not supported by the Spot Testnet.