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Nothing really. The price is pulled from Coingecko which pulls it from Bittrex. Check this out: https://www.coingecko.com/en/coins/hive_dollar

And check the 24h volume and you'll see. 😉

$6 in the last 24 hours? impossible. They are only covering Bittrex trade volume as you said.

Yes. It's kinda stupid that the Bittrex price is fed to PeakD, people freak out every time this happens. I use Hive internal markets advanced setting to check out the HBD/HIVE price movements cos that's the value I'm trading it anyway