Robinhood Chain · Uniswap v4
Small stones pay small. Boulders pay like boulders.
Every token is a stone in a pond. A small order barely ripples and pays the pebble rate; an order big enough to move the pool by itself pays like the boulder it is. The rate is read off the pool in the block the trade lands, every fee goes to one address, and the liquidity settles into the silt for good.
Throw one in
skipper5.96%
- 0.05 ETH
- Order
- 3.93%
- Splash
- 5.96%
- Pays
A fresh plunk is about this deep. The pond deepens with every buy, so the same order splashes less later.
One transaction
The supply is minted, the pool is opened against native ETH, and the pool's share settles into the silt. Nothing is charged at the door — plunk is not even payable.
The fee is the splash
Every order is measured against how deep the pool is right then. A pebble pays the floor. Past that the rate climbs one point for every two points of splash, until a boulder — an order a third the size of the pond — pays the cap. Same rule buying and selling.
Read in the same block
The hook reads the pool's depth in the transaction that charges the fee, so a rate is never a quote from a moment ago. The three numbers that make the curve are constants with no setter, and the address every fee goes to is an immutable.
The curve
A flat fee charges a 0.01 ETH buy and a 10 ETH sniping bot the same rate, and it is the second one that empties a fresh pool. Here the small order pays the least this launchpad ever charges, and the order big enough to move the price by itself pays for the room it takes.
Nothing is refused. A boulder is allowed in — it just pays like one. And a dump into a shallow pool is a boulder too, so the rule cuts both ways, and every basis point of it goes to the same address.