MEXC is an offshore crypto exchange based in Seychelles with no tier-1 regulation and a history of licence issues and regulator warnings. Its welcome program is advertised as a large package, but the genuinely usable part is small, with the rest being non-withdrawable futures credit. It does not serve the United States.
Risk warning: Trading carries a high risk of losing money, especially with leveraged products such as CFDs. A bonus does not reduce that risk. Only deposit what you can afford to lose.
MEXC
MEXC advertises welcome gifts up to 8,000 USDT, but the bulk is non-withdrawable futures bonus credit. The genuinely usable part is roughly 40 USDT in vouchers.