How AMMs work, slippage, MEV, gas fees, and the routing aggregators that quietly save retail traders the most money.
DEX trading is buying and selling crypto on decentralised exchanges — smart contracts that hold pooled liquidity rather than custodial order books. The major venues in 2026: Uniswap on Ethereum and L2s, Raydium and Jupiter on Solana, 1inch as the cross-chain aggregator, Aerodrome on Base. DEXes use automated market makers (AMMs) that price tokens by pool ratio rather than by buyer/seller match. The trade-offs vs centralised exchanges: no KYC, no custodial risk, broader long-tail token coverage — but more gas friction, MEV exposure, and slippage on illiquid pairs. Knowing how AMMs work, when to use an aggregator, and how to set slippage tolerance is the difference between netting 2% better fills and getting sandwich-attacked on every trade.
An automated market maker (AMM) is a smart contract holding two (or more) tokens in a liquidity pool. The price between them is determined by the ratio of the two reserves. The classic Uniswap v2 formula: x × y = k — the product of the two reserves stays constant.
What that means in practice:
This is why a $50,000 trade on a pool with $200,000 of liquidity has 25%+ price impact, while the same trade on a $50M pool has under 0.1% impact. Pool depth is everything; price discovery is just the side effect.
| DEX | Chain | Best for |
|---|---|---|
| Uniswap v4 | Ethereum, Arbitrum, Base, Polygon, Optimism | Default EVM blue-chip and mid-cap trading. Concentrated liquidity. Hooks for custom logic. |
| Raydium | Solana | Solana memecoin trading. Auto-graduates pump.fun launches. Deep liquidity on top-100 SPL tokens. |
| Jupiter | Solana | Solana DEX aggregator — routes across Raydium, Orca, Meteora, Phoenix. Best price for nearly all Solana trades. |
| 1inch | EVM (multi-chain) | EVM aggregator across Uniswap, Curve, SushiSwap, Balancer, Aerodrome, Cake, etc. Best price for multi-chain EVM trades. |
| Aerodrome | Base | Base-native DEX with veAERO token economics. The default for Base-resident users. |
| Curve | Ethereum + L2s | Stablecoin-to-stablecoin trades (USDC ↔ USDT ↔ DAI). Lowest slippage in the category. |
| PancakeSwap | BNB Chain (also EVM) | Default BNB Chain DEX. Larger memecoin tail than EVM peers. |
Slippage is the difference between the price you see and the price you actually get. It comes from two sources: price impact (your trade moves the pool) and front-running (a bot trades ahead of yours, moving the price further).
The typical wallet defaults are 0.5% (Uniswap, Phantom) or 1% (legacy MetaMask). The right setting depends on what you're trading:
MEV (maximal extractable value) is the value that block builders extract by reordering transactions inside a block. The retail-facing version: sandwich attacks, where a bot detects your pending swap, places a buy ahead of you, lets your trade execute (pushing the price up), then sells the position you just inflated.
The sandwich tax on EVM mainnet is real and large — estimates put aggregate retail losses to MEV at $500M+ annually. Mitigations:
| Chain | Typical swap fee | When to use |
|---|---|---|
| Ethereum mainnet | $3 – $50 | Large ($10k+) trades; institutional flow |
| Base | $0.01 – $0.10 | Default L2 for retail; growing memecoin scene |
| Arbitrum | $0.05 – $0.30 | DeFi power-users (Pendle, GMX) |
| Optimism | $0.05 – $0.20 | Velodrome, Synthetix |
| Polygon | $0.01 – $0.05 | Mass-market consumer apps |
| Solana | $0.0005 – $0.005 | Memecoin trading; high-frequency retail |
| BNB Chain | $0.10 – $0.50 | Asia-facing memecoin and DEX volume |
Match the chain to the size of the trade. A $200 trade on Ethereum mainnet at $20 gas is paying 10% fees just to enter. Same trade on Solana costs $0.001. The fee differential is structural, not a temporary state.
Premium Domain · 50% Off
Short, memorable, exact-keyword for the multi-chain consumer-crypto category. Half price for a limited window.