The main thing here is a collaborations between these two companies which gives you a quick arbitrage session. And this works best with INR, BRL and other currencies and exchanges that have the biggest price gap compared to other exchanges.
Mistertango.com is a crypto friendly EU bank with 3% CC top up fee. All your money (SEPA, EUR) at Mistertango account are instantly available at BTC-exchange.com for EUR/BTC purchase (no trading fees!) and these guys withdraw BTC as soon as possible (next block) for 1% and (!) no less than 0.005 BTC withdrawal fee. This is basically an hour or two fast cycle.
To start doing this just pass the Mistertango verification process (which takes up to 1 hour and requires to download their android/iOS app), activate the 2FA security option (must do for this scheme), top the balance up and start buying BTC at BTC-exchange.com instantly. I would recommend to trade at least 0.5 BTC to keep withdrawal fee as low as 1%. After you deposit your cheap BTC to your preferred exchange, sell them there and top up Mistertango's account again.
These two are legit 3 year old companies with all the necessary licences. Your first few BTC withdrawals will probably be suspended for security review (better do these first transactions during working days on business hours), but after that - your're all free to rush it. Again, just activate the 2FA.