What is DEX?

A decentralized exchange trades assets on-chain against liquidity pools rather than through an order book an operator holds. Prices follow the pool's ratio math; settlement is the chain's; custody is nobody's.

Aggregators sit above DEXs, splitting one order across pools and venues for the best net price: the structure behind most retail swap flows today.

How DEX works

A decentralized exchange trades against on-chain liquidity without an operator holding anyone's funds. The canonical shape is the pool: a contract holding asset pairs, pricing by ratio math, executing swaps as plain transactions. No accounts, no custody, no withdrawal queue; the chain settles everything.

Aggregators sit above individual DEXs, composing routes across pools and venues for the best net execution. The aggregator does not hold funds either; it computes a path and the trader signs it. Competition between venues expresses itself as pool depth and fee structure, both visible on-chain.

The tradeoffs versus centralized exchanges are operational: you keep your keys and your counterparty is a contract, in exchange for accepting pool-based pricing, approving router access, and losing venue-held order-book depth. For settlement into payment assets, where the goal is conversion rather than market making, the DEX path is the natural fit.

DEX in practice

Swapping a tokenized stock position into a USD peg runs through the aggregator: it compares the pools quoting that pair, splits the trade if that helps, and settles the output to your wallet in one transaction with the fee shown before signing. The whole interaction is three facts on one screen: what you spend, what you receive, what it costs. Everything competitive about the venue layer is compressed into that receive number.

DEX on U.CASH

U.CASH Swap is a DEX aggregator: it routes each swap across the pools and venues with the best net price, and the trade settles in one signed transaction.

For merchants, the DEX layer is the conversion infrastructure under checkout: buyers pay from any asset because routing exists, and receipts convert to settlement assets without an exchange account in the middle. Non-custodial throughout matches how the rest of the money moves. For sizing perspective: the DEX layer's liquidity is real but not infinite, which matters on institutional-scale conversions. Routine merchant flows sit far below the depth where routing strains, and the aggregation layer absorbs what seasonal spikes leave behind. The one pattern to avoid is a single enormous conversion at a thin hour, which is market timing advice, not a platform limitation.