You can set the IP(s) that are allowed to use your API key. No other IP address will be able to use your API key.

Add IP whitelist

NOTE: Because we don’t disable IPv6 to ensure everyone can use our website, the IP you need to whitelist may be a longer address like 2001:67c:2628:647:10::277. To get the correct address, please look here to see your IP.

ONLY whitelist the short IP like 1.1.1.1 if your server/device does NOT have a IPv6 address. But if you have a long IPv6 address like 2606:4700:4400::6812:256f then whitelist that instead..