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DEXs with the Biggest 30D Trading Volume

Bloxy data shows that dYdX ($252M) leads with its leveraged trading, borrow/lend capabilities, and a recently launched BTC perpetual contracts market.
Uniswap is the second exchange ($234M) with its Automated Market Maker model that provides liquidity advantages.
Kyber Network, launched in 2017, takes the 3rd place with $88M.
Fair to notice, that DEX volume is still tiny in aggregate compared to centralized exchanges.