What is SBD pegged to?

tomino(54)
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8y

Should be pegged to USD, give or take, right?
... but these days is seems more like is coppies Steem price.

Confusing...

DQmUyAQExGHoBojneLG2bm7Xpo1NuD9bori72Umo7KjttTE.jpg

picture courtesy:
https://steemit.com/steemit/@ats-david/thoughts-on-steem-backed-dollars-and-holding-the-peg

What is SBD pegged to? | Ecency