Two different bets
OKX holds second place on spot book depth while matching almost anyone on trading pair count. MEXC cannot claim depth, but wins on two things OKX lacks: early listing and a zero maker tariff.
The fee decides more than it seems
On MEXC a limit order that rests in the book and waits to fill costs nothing. For strategies with many trades, that outweighs almost everything else.
It shows most clearly in triangular arbitrage: three trades at the usual 0.1% cost 0.3% — more than any triangle yields. At a zero maker fee those same trades cost nothing. Of the every venue we cover we track, the working triangles today are almost exclusively on MEXC.
OKX's base maker rate is below the market average, but it is still not zero.
Depth decides whether the order fills
Here OKX wins outright. On MEXC, pairs turning over a few thousand dollars a day sit beside real coins: one order moves the price tens of percent and a visible opportunity turns out unfillable.
The rule: on OKX you can go by price; on MEXC only by price together with volume and book depth.
The OKX Web3 wallet
A non-custodial wallet with a DEX aggregator lives inside the OKX app: buy a coin on spot, move it to your own wallet and swap it on a decentralised venue without leaving the interface. MEXC has nothing equivalent.
For work spanning centralised and decentralised venues that shortens the path considerably.
What to know
In February 2025 OKX pleaded guilty before US authorities to operating without a money transmitting licence and paid around half a billion dollars. A separate detail: for European Economic Area users the exchange runs a distinct legal entity on a distinct domain — accounts and API keys do not carry across.
MEXC has no comparable episode, but it has a trait worth noting: coins arrive fast and get delisted just as fast. A long-term position in an exotic coin there is a risk of its own.
Who each suits
OKX — for core trading, size and DEX work.
MEXC — for limit-order strategies where fees decide, and for new listings in their first hours.
