FOLLOW THE MECHANISM
- 1Authorize
A simulated trader permits a bounded input transfer.
- 2Execute
Contracts apply price and minimum-output conditions.
- 3Settle
Balances and fees change in the same accepted transaction.
A conceptual sequence. Real implementations can add steps, intermediaries, and conditions.
Settlement is the key distinction
A decentralized exchange uses blockchain transactions and smart contracts to settle trades. This does not require every component to be decentralized. Order discovery, websites, routing and transaction ordering can involve operated services. Some DEXs use pools; others use order books or signed quotes. The label describes a family of architectures, not a single security model. To understand a particular venue, identify who holds the assets before execution and what exact conditions authorize the transfer.
Follow one swap
In a pool-based swap, a trader authorizes input tokens, a contract checks the requested exchange, and reserve balances change when the transaction executes. A minimum-output condition can make the swap revert if the result is too poor. Atomic execution means the transaction’s state changes either complete together or revert under the chain’s rules; it does not mean submission is instantaneous. The trader may still pay execution fees for a reverted transaction, and a pending quote can become stale.
Several parties receive value
A swap can pay a liquidity-provider fee, possibly a protocol fee, a network execution fee and an interface or routing fee. These charges serve different recipients and need separate labels. Liquidity providers supply inventory and bear its changing composition. Validators or sequencers order transactions. Arbitrageurs connect prices across markets. Calling the system peer-to-peer does not erase these roles: automation changes how they interact, and how payment and control are enforced.
Self-custody does not remove execution risk
A contract can have a bug, an approval can permit unwanted transfers, an oracle can be wrong, or an administrator can change an upgradeable component. Even immutable code can implement an undesirable trade. A familiar token symbol can refer to an unrelated contract. The important boundary is between custody before a transaction and permissions granted during one. A functioning blockchain only establishes that execution followed its accepted rules; it does not certify that the application is sound or the token valuable.
MAKE IT CONCRETE
Same screen, different trust
Two interfaces may call the same pool. One can still add a routing fee or present misleading token information. The pool’s settlement rules and the interface’s behavior must be assessed separately.
FAILURE PATHS & COMMON MISREADINGS
Where the model can break
- Not every DEX uses an AMM.
- A failed swap can still consume network fees.
KEEP EXPLORING