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I don't know of any such service that would work with BTS and MPA (bitUSD, bitCNY and etc.).
All such services usually work with one blockchain. mrkt.cash will integrate many blockchain.

I currently use coinspot and I can buy pretty much all the cryptos using fiat currency.

Maybe I am just not getting it.

You are talking about www.coinspot.com.au? This service only works in Australia and it has high fees.