Atomic Swap
An atomic swap is a smart-contract-based trade in which two parties exchange tokens across different chains (or within the same chain) with a guarantee that either both legs execute or neither does. No custodian, escrow, or centralized exchange sits in the middle.
✦ Key Insight
Atomic swaps reduce counterparty risk for cross-chain trading, which has historically been the most exploited area in crypto. For traders moving between ecosystems — Bitcoin to Ethereum, or L1 to L2 — they enable trustless exits without trusting a bridge operator.
✕ Common Misconceptions
Confusing atomic swaps with bridge swaps — most "cross-chain" DEXes are bridges, not atomic swaps.
Setting time locks too short and getting refunded mid-trade.
Trading illiquid pairs where finding a counterparty is impractical.
Detailed Explanation
How It Works: Both sides lock funds in contracts that use Hashed Time-Locked Contracts (HTLCs). The first party reveals a cryptographic secret to claim the counterparty's funds; the act of revealing it allows the counterparty to claim theirs. If the secret is never revealed within a time window, both sides reclaim their original funds.
FAQs:
Why aren't atomic swaps more popular? They require both sides to be online and matched, which is slower and less convenient than AMMs.
Are they truly trustless? Yes for the swap itself, though wallets and clients still need to be trusted code.
In Practice
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