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Aloe Blend uses silos to take advantage of external yield opportunities and keep users' funds productive. This is possible because most Uniswap liquidity sits idle, far from the current trading range. Instead of leaving it there, Blend deposits it to silos. If the price does shift, Blend can recenter its Uniswap V3 position without locking in impermanent loss － it just pulls the requisite funds from silos. Alternatively, if the price stays the same but volatility increases, Blend pulls from both silos in order to widen its Uniswap position. Finally, if volatility decreases, Blend narrows its Uniswap position and places excess liquidity in silos. At any given time, silos manage between 45% and 94% of pool liquidity (because 1%－50% is in Uniswap and 5% is held as float).
Each silo contains just enough logic to move funds from Blend to another protocol and back again. Since Blend vaults delegatecall to their silos, a single silo can be reused by multiple Blend vaults.
Supplies funds to Rari Fuse. Logic compatible with any fToken (not fETH). Specify fToken address in silo constructor. Note that fTokens are pool specific, e.g. fDAI 8 is not the same as fDAI 18. poke() accrues interest on the fToken.
Supplies WETH to Rari Fuse. Unwraps WETH to ETH when depositing and rewraps it when withdrawing. Specofy fETH address in silo constructor. Note that fETH tokens are pool specific, e.g. fETH 8 is not the same as fETH 18. poke() accrues interest on fETH.
Supplies funds to Rari Fuse pools that have in-kind token rewards, e.g. fTRIBE when TRIBE is being distributed as an incentive. poke() searches for these in-kind rewards and claims them. Otherwise same as a standard fToken Silo.
Deposits assets to a Yearn vault. Behavior would be sub-optimal (but non-breaking) in cases where atomic withdrawal limit is less than balance, as only Yearn keepers have permission to replenish withdrawal queue strategies. In practice this hasn't been an issue.