would it be possible for you to upgrade your API and release a version 2 or something, it needs some twerks in my opinion.
for example right now there is about half a dozen markets that are closed/disabled for various reasons but there is no way i can know that through the API unless i try to make an order and receive the error.
other places usually have a field in their JSON response (in your "Data") called IsActive which shows false if the market is disabled.
also this other one may not be as important but it makes things faster.
https://www.cryptopia.co.nz/api/GetMarketOrders/DOT_BTC has a lot of useless data, "TradePairId":100,"Label":"DOT/BTC" is being repeated for no reason. it can simply be a field which has an array in front of it. the "Total" field is also unnecessary.
also it is best if the
https://www.cryptopia.co.nz/api/GetMarkets includes a little field called "LastUpdated" so it indicates when it was updated last time.