By the end you will know what changed when LPs could choose a price range, why it made pools dramatically more efficient and LPing dramatically harder, and what out of range really means.
Every city has this vendor. The cart is never where you left it yesterday: it is wherever the crowd is today. Office corner at lunch, stadium gate at night.
CP8's booth served the whole street evenly, even the dead ends. In 2021, Uniswap v3 asked LPs a vendor's question: why park where nobody walks? This lesson is what happened when the booth learned to move.
Here is CP7's pot, drawn as a street. A v2 pool spreads its liquidity across every possible price, from zero to infinity. That flat line is the booth serving the entire street at once, including the ends nobody visits.
Now look where the crowd stands. Trading happens near the current price, almost all of it, almost always. The far reaches of that line hold real money that may never serve a single trade. Most of the pot never works a day.
The v3 idea, function first: let each LP pick two prices and say, my money serves trades only between here and here. Nothing added, nothing borrowed. The same capital, pulled off the empty ends and stacked at the busy corner.
The pool becomes far deeper exactly where trades happen, so the same trade moves the price less. The name came after the function: concentrated liquidity. The vendor stopped serving the street and started following the crowd.
Pick your two prices and the board draws them as a shaded band around the market. The name: a range. Inside it your cart is parked in the crowd: every trade at these prices uses your liquidity, and you collect a far bigger share of the fees than the same money ever earned in v2.
But bands have edges, and crowds move. Before we watch it happen, place your bet.
Here is the new deal in one picture. While the price sits inside your band, you earn hard. The moment it leaves, earnings stop entirely: not reduced, stopped. The crowd now trades at prices your money does not serve.
And it leaves a parting gift. Crossing the band's edge, the pool converts your whole position into the token the market likes less: CP8's booth rebalancing, compressed into one short walk. Tap the three markers to read the board.
This turned LPing from a deposit into a job. Choosing ranges, watching the price, re-centering when it drifts, sometimes hedging: v3 created professional LPs, strategy firms, and a shelf of tooling. Passive money mostly retreated to stable pairs, v2 style pools, or vaults, which CP15 will open.
So who is paying? Traders, exactly as in CP8: a fee on every swap. What changed is who collects. The fees flow to whoever positions best, the way street corners pay the vendor who reads the crowd.
A friend brags: their narrow range earns triple what your wide one does. On today's board they are right. The narrower the band, the bigger your share of the fees while the price is inside it. Their whole cart is pressed against the crowd.
Before you copy the trade, remember what bands do at their edges. What is the brag leaving out?
Name the trade honestly: v3 bought capital efficiency and paid for it with management burden. Deeper markets at the prices that matter, in exchange for somebody, somewhere, doing the babysitting.
DeFi keeps making this exact trade, and CP15's vaults exist precisely because most people refuse the job: they hire a driver and pay the fee. Concentration pays exactly to the degree you work it. Which raises the obvious question.
Zoom out. CP7 built the pot, CP8 made you the house, and this checkpoint gave the house wheels. Ranges and active LPs sit between those machines and CP15's vaults, where the driving gets hired out.
One test before we finish: if concentration is this efficient, find the edge of the lens.
You now hold the v3 deal in one picture: a band around the price, fat fees inside, silence and a converted pocket outside, and a job description nobody printed on the deposit screen.
A pool is money waiting to trade. The other half of banking is money waiting to be borrowed. Next: the lending machine, where a pawnshop that never closes sets your rate by how empty its shelves are.