When you swap on Base, your trade gets filled by a liquidity pool, a shared reserve of two tokens that anyone can contribute to. For years, most of these pools worked the same simple way. Newer pools, including many of the ones routing swaps on Base today, work differently. Understanding the difference helps explain why some trades barely move the price and others do not.
The old model: liquidity spread across every price
The original automated market maker design, popularized by early Uniswap versions, asks liquidity providers (LPs) to deposit both tokens in a pool and spreads that liquidity evenly across every possible price, from zero to infinity. It is simple and it works, but it is wasteful. A pool holding, say, USDC and ETH has to reserve capital for the possibility that ETH trades near $0 or near $1,000,000, prices that will basically never happen. Only a small slice of the deposited capital ever sits near the price where trading actually occurs.
That inefficiency matters to traders too, not just to LPs. Thinner liquidity near the real trading price means larger trades push the price further, an effect called price impact. If you want to understand how price impact differs from slippage, that is covered in a separate article on this blog.
Concentrated liquidity: choosing where your capital works
Concentrated liquidity, introduced by Uniswap V3 in 2021, lets LPs pick a specific price range for their deposit instead of covering the whole curve. An LP providing an ETH and USDC pool might choose to concentrate their capital between, say, $2,800 and $3,200 per ETH, rather than spreading it from zero to infinity.
Inside that chosen range, the LP's capital behaves like it is worth far more than the same dollar amount spread across the full price curve, because all of it sits exactly where trading is happening. Depending on how narrow the range is, this can make a given deposit provide the same trading depth as a much larger deposit under the old model. That is the origin of the capital efficiency claims you will see attached to concentrated liquidity pools.
The tradeoff is that if the price moves outside the chosen range, the LP's position stops earning fees and effectively converts entirely into whichever of the two tokens is now less valuable, until the price moves back in range or the LP adjusts it manually. Concentrated positions also experience impermanent loss more sharply than spread-out ones, since all the capital is exposed to price movement within a narrow band. This blog's liquidity pools and impermanent loss article covers that mechanic in more depth.
Where this shows up on Base
Base's largest native exchange, Aerodrome, runs two kinds of pools side by side. Its original pools work like the older, full-range model and suit assets that trade in a fairly predictable ratio, like two stablecoins. Alongside those, Aerodrome runs Slipstream, a concentrated liquidity module launched in March 2024 and built on the same design Uniswap V3 popularized. Slipstream pools let LPs set custom price ranges and, according to Aerodrome, now carry the large majority of concentrated liquidity trading volume on Base.
Each Slipstream position is tracked individually, similar to an NFT, rather than as a fungible pool share, because every LP can choose a different range. That is a structural detail worth knowing if you ever look at LP positions in a wallet or block explorer and notice a swap pool represented as a unique token rather than a simple balance.
What this means for you as a swapper
For someone using a swap wallet, the mechanics of concentrated liquidity mostly happen behind the scenes. A router finds the best path across whichever pools have the deepest liquidity near the current price, whether that pool uses the older full-range model or a concentrated one. Still, a few practical takeaways carry over:
- Deeper liquidity near the current price generally means less price impact on your trade. Concentrated liquidity pools are part of why some token pairs on Base show noticeably tighter pricing than others.
- Liquidity depth can change quickly for concentrated pools. Because LP capital is packed into narrow ranges, a sharp price move can push a large share of that liquidity out of range at once, temporarily thinning the pool right when volatility is highest. This is one reason price impact can spike during fast market moves even on pairs that normally trade with very little slippage.
- A quote is a snapshot, not a guarantee. Whatever the underlying pool design, always let your wallet simulate the transaction and check the expected output before confirming, particularly during volatile periods.
The bigger picture
Concentrated liquidity did not change what a swap fundamentally is: two tokens trading against a shared reserve based on a pricing formula. What it changed is how efficiently that reserve can be built, letting the same amount of deposited capital support tighter pricing for traders, at the cost of more active management for the people supplying it. On Base, where Aerodrome's Slipstream pools now handle a large share of concentrated liquidity volume, this design is quietly behind many of the swaps that route through the network every day.