Hey @Daan, it's been a while, so the fact is that I don't remember exactly what is the output we get from the API.

So first, try to print the entire JSON response. Just put a print statement before returning the JSON response so that you can see the entire output which is coming from the API. Then you can try tweaking the params. For more info check this official docs - https://coinmarketcap.com/api/documentation/v1/

Hope it will help... And thanks for the appreciation!