How can I get all the coins at once?

You can retrieve 5000 coins each time by using the offset parameter to move up 5000 spots each time.

Example

This will get you the first 5000 coins: https://api.coinranking.com/v2/coins?limit=5000

This is how you pick up the coins in spots 5001 - 10.000: https://api.coinranking.com/v2/coins?limit=5000&offset=5000

The next endpoint for spot 10.001 - 15.000 would then be like this: https://api.coinranking.com/v2/coins?limit=5000&offset=15000