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I don't know if it's a function that's in built to the blockchain and PeakD just made a button for it but I believe it's not up to them but the witnesses/developers to change it if there's demand, rather than PeakD.

I think the moral here is, just check all the different options available and what works best for you. Some people get put off by charts and graphs/exchanges and just want a button that does the exchanging for them so that's where the benefit of the Convert HBD feature comes in

That's true...we must explore all the possible option....anyway do you have any ide, how different dapps shows different reward value....have you noticed that ?

Honestly, I haven't noticed that but I only use PeakD as I'm so used to it now. I don't know how other dapps show their rewards. I did use Dapplr but it munched over 8 GB of data in the month trial I gave it and was slowing down my phone so removed it from my phone.