Decentralized Exchange (DEX)

A decentralized exchange (DEX) is a trading venue where no central party holds user funds. Trades happen peer-to-peer, secured by cryptographic protocols rather than by trusting an operator.

For Bitcoin specifically, the main DEX patterns are:

• Atomic swaps between BTC and other assets - HTLC-based trustless exchange. Slower than centralized order books but custody-free.
• Robosats - a Tor-only peer-to-peer marketplace using Lightning escrow. Order book matches BTC against fiat (sent via local payment rails); escrow is held by a Lightning HTLC, not by the platform.
• Bisq - longer-established peer-to-peer marketplace with on-chain multisig escrow. Slower than Robosats but more flexible payment methods.
• Submarine-swap providers like Boltz Exchange for trustless on-chain ↔ Lightning conversion.

Strengths:

• No custodian. You never hand your keys to a service. Counterparty risk is bounded to the specific trade and protected by escrow.
• No KYC in most cases. Some peer-to-peer venues operate fully anonymously; others let you choose your level of identification.
• Censorship resistance. No central operator to be subpoenaed or pressured into freezing your account.

Tradeoffs:

• Liquidity is thinner. Centralized exchanges have deeper order books for almost every pair.
• UX is rougher. DEX interfaces are typically less polished than commercial exchanges.
• Fiat ramps are local. You're often paying via bank transfer, cash deposit, or local payment apps rather than a unified deposit flow.

For users who care about avoiding counterparty risk and KYC, DEXs are the principled answer. They're not as smooth as Coinbase, but they preserve the properties that brought you to Bitcoin in the first place.