$CRUMBLE Docs

03 · Money

Fees

One percent of the change. Not of your swap, not of your balance.

What we charge

When your change is invested, 1% of it goes to the treasury and the remaining 99% buys your basket. On a 58 cent round-up that is a little over half a cent.

LineAmount
Your swap$7.42 — untouched
Rounded up to$8.00
Change$0.58
Crumble fee, 1%$0.0058
Into your basket$0.5742

The fee is taken in the token you paid with, before the change is split between legs. If a swap produces no change, there is no fee.

The ceiling is in the code

The contract declares MAX_FEE_BPS = 500 and refuses any attempt to set the fee above it, at deployment or afterwards. Five percent is the highest the fee can ever be, and that is enforced by the contract rather than promised by us. A change to the rate applies to future round-ups only.

What we never charge

Network fees

You pay gas on your own transaction, as you would for any swap. Robinhood Chain is an L2 and this usually costs a fraction of a cent. Because the round-up rides inside the swap you were making anyway, it does not cost you a second transaction.

What the pool takes. Separately from our fee, each Uniswap v3 pool charges its own swap fee, which goes to that pool's liquidity providers and not to us. The app's quote already accounts for it — the figure it shows you as landing in your basket is the figure after both.