Bisq is probably the most known decentralized exchange. Transactions counts :
BTC / EUR : 105 k
BTC / USD : 72 K
BTC / GBP : 18 K
AND
BTC / XMR : 41 K
BTC / ETH : 2 K
BTC / LTC : 0.3 K
BTC / ZEC : 0.2 K
Monero volume is around 20x ETH, 2x the GBP, 57 % of USD and around 40 % of EUR (the most traded), the real question is why ? Why Monero is so used ? I think because Monero is the only one that fulfill the original conception of electronic cash system by cypherpunks, not Bitcoin...
https://image.nostr.build/34f116b28660cfe357e0fd23e5f0289f80df4ed84e12890ab2940577fe19ece6.png
https://image.nostr.build/758110a79a486ae3c2c0e202c077e9850f5629f55a4cfa2e3c84c9eb9ed53752.png