Are you looking for OTC exchange? What kind of currency that you want to exchange?
If you want to exchange different kinds of coins/tokens, maybe regular exchange such as Binance is much better. Anyway, you can try OTC deals on Bitmax, Huobi, and several others exchange that provides OTC room.
Localbitcoins and Paxful is also a nice choice. I don't think they require you to deposit first before you can use the site, unless you want to sell Bitcoins.
Maybe try our service. Dove Wallet
https://dovewallet.comThere's some minimum deposit amount but it's not that much.
Looks like there's no liquidity yet? Only bot trades.