If you already hold other crypto, you can swap for BTC on protocols like Uniswap or PancakeSwap without any registration.

Some platforms like MEXC and CoinEx allow trading and limited daily withdrawals (e.g., up to 10 BTC ) for unverified accounts.

Platforms like Bisq and Hodl Hodl are the gold standard. They connect buyers and sellers directly, using escrow smart contracts instead of a central authority to secure the trade.