By the end you will know the layer most people actually touch: the machines that drive the other machines, what each one optimizes, and the commission it takes for the wheel.
Think of the last trip you booked. You did not call the airline, the hotel and the transfer desk one by one; something assembled the trip while you tapped once. Money works the same way. Almost nobody hand-drives every machine they use.
And by now you know the machines: pools, ranges, loans, receipts. The concentrated liquidity checkpoint was honest about it: running a range well is a job. This lesson is about the layer that does the job for you, and what it charges for the wheel.
You could book every flight, hotel and transfer yourself. The travel agent knows the routes, watches the prices, moves fast, and takes a commission you mostly never itemize. DeFi grew the same profession: machines that drive the other machines.
This is the layer most people actually touch. Three agents work the desk: one runs your money, one shops your trades, one takes your order and finds its own way there. Meet them one at a time.
Agent one, function first: many depositors pool money into one shared strategy, and the strategy runs itself. It re-centers ranges, harvests rewards, compounds them back in, rotates to better pastures: the exact babysitting the concentrated liquidity checkpoint priced in sweat. The name: a vault.
Yearn is the ancestor: the protocol that turned yield strategies into a deposit box, and the pattern is everywhere now. You hand over the itinerary planning. The agent flies your money for you.
So who is paying here? You are, twice. A management fee taken from the balance, a performance fee taken from the yield: the commission is skimmed before the return ever reaches you. No trickery in that. Agents work for commission everywhere on earth.
The honest comparison is never fee versus free. It is fee versus what the job costs you: hours of watching, gas on every re-center, mistakes at 3am. For most depositors the agent is cheaper. The point is knowing you hired one.
Agent two works the swap desk. You ask for a trade; instead of walking into one pool, it shops every pool in the city and hands you one quote. Function first: a route shopper. The name: an aggregator, and 1inch is the classic.
Here is the puzzle. Sometimes its quote beats the biggest pool's own price for the same swap. Place your bet before the machine opens.