What is the best "order book type" (i.e. not using bonding curve ala Uniswap) DEX out there? I got asked the question and I am surprised I could not come up with a name 👀 

I initially would have said 0x but I think they pivoted away from that vision...

co-founder at fairmint.com.
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Dydx

I think Solana has some CLOBs
Ethereum block timess are too long and it's too expensive to keep updating chain state with the latest order book prices