Yes. RELAY Classic runs its own order book of 0x based orders, which also connects to and pulls orders from 0x mesh.


RELAY uses all of Classic's order books, and also pulls liquidity (using 0x v3) from other sources such as Curve, Kyber, Uniswap, and Oasis.


For information on the 0x protocol and 0x mesh, please see https://0x.org.