Please note that you need to provide your Coin Marketcap API key in the crypto.dart file, thus setting the X-CMC_PRO_API_KEY header value.
This should actually be set by environment variables, I recommend this approach https://itnext.io/flutter-1-17-no-more-flavors-no-more-ios-schemas-command-argument-that-solves-everything-8b145ed4285d
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