Pies (Smart Pools)

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Pies (Smart Pools)
Pie Smart Pools are non-custodial smart contracts, the first implementation of a DAO-governed AMM pool. They add extra functionality on top of vanilla AMMs pools.
Providing liquidity to one of these Pies gets you tokenized exposure to the underlying assets and additionally generates yield from the liquidity in these pools to perform token swaps.
The Pie Smart Pools are asset management agnostic. At the time of writing, Pie Smart Pools are compatible with the Balancer interface.
Background
Balancer is an Automated Market Maker protocol, similar to Uniswap, which allows anyone to create a self-balancing index fund-like token. Those pools can be either Controlled or Finalized Pools.
1.Controlled pools are configurable by a “controller” address. Only this address can add or remove liquidity to the pool (call join or exit). This type of pool allows for great flexibility and implementation of custom functionality besides allowing the change of fees, pool assets, and their weights.
2.Finalized pools have fixed pool asset types, weights, and fees.
Any pool created on the Balancer protocol is used to aggregate liquidity when users want to swap one token for another.
Supplying Assets
Suppling assets to a Pie will mint the Pie to your Ethereum wallet. Pies are represented by an ERC-20 token balance, which entitles the owner to a proportional share to an increasing quantity of the underlying asset.
There are two ways of supplying assets:
1.Weighted-asset deposit/withdrawal
2.Single-asset deposit/withdrawal
Represented in the smart contracts by the following functions:
joinPool allows deposits where all the underlying quantities of assets are according to weights.
function joinPool(uint256 _amount) external virtual override ready noReentry
joinswapExternAmountIn allows a deposit where only one of the underlying quantities of assets is provided. Depositing a single asset is equivalent to depositing all pool assets proportionally by swapping the provided assets, which includes slippage.
Redeeming Pies
Redeeming assets in the Pie is equivalent to burning Pie tokens in the non-custodial smart-contract.
exitPool allows Pie holders to burn Pie tokens and receive the underlying quantities of assets according to weights.
function exitPool(uint256 _amount) external override ready noReentry {
exitswapPoolAmountIn allows Pie holders to burn Pie tokens and receive only one of the underlying asset. Exiting to a single asset is equivalent to swapping the other underlying assets for the chosen one, which includes slippage.
On a standard finalized Balancer pool if an asset transfer function reverts it is not possible to redeem any of the underlying assets.
Pie Smart Pools allow exiting the pool even with multiple frozen assets in it by using a specific function designed to limit the loss of frozen assets.
@param _lossTokens Tokens skipped on redemption
​
function exitPoolTakingloss(uint256 _amount, address[] calldata _lossTokens)
Features & Use Cases
Pie Smart Pools implement a wide range of additional features, from safeguards to flash loans, designed for a different use case that a specific allocation might benefit from.
Flash Loans
A Flash Loan allows you to borrow an asset without the need for collateral as long as the asset is returned within the same transaction.
Flash Loan technology allows users to use fewer transactions, thereby reducing fees.
They allow users to perform a variety of operations including arbitrage, refinancing, and more. Borrowers of Flash Loans might have to pay fees when returning the funds.
Pie Smart Pools allows for Flash Loans via the PFlashLoans smart contract pool.
Unlike other platforms offering Flash Loans, for security reasons PFlashLoans does not imply funds have been returned after a smart contract call by looking at the balances at the end of a transaction. It explicitly sends funds back to the Pie Smart Pool.
In some cases, PFlashLoans Pools could be used for more reasons than borrowing funds, for instance, a Pie containing governance tokens of some DAOs could use the Flash Loan mechanics to vote by owning the Pie instead of the governance token.
Dynamic Fees
The DAO governed function setSwapFee() in PieDAO Smart Pools allows for a dynamic fee system that can respond quickly to the expansion and contraction of demand for specific assets in the pool according to external factors.
Fees can be either decided directly by DAO participants or algorithmically determined according to specific factors.
Additionally, a dynamic fee system can be used to influence trading frequency within the pool, and either incentivize or disincentivize rebalancing until a certain maximum deviation from the nominal % allocations is reached.
Similarly to other industries, the ability to set pricing rules with a powerful algorithm that takes the price elasticity of tokens into account is likely to become an essential property of successful pools.
Dynamic Weights
Pies are different in nature, some will be designed to boost diversification, others to maximize yield. Pie Smart Pools allow time-based weight adjustments to run off-chain and be notarized by DOUGH token holders.
One early example is USD++, in which weight function takes into consideration several different factors including the volatility compared to the peg of $1, trust minimization, and market risk, allowing weights to be adjusted every quarter by the DAO.
Dynamic Weights can be used to roll expiring futures contracts, offering perpetual exposure to an asset class, and even replicate derivatives such as protective puts and calls.
ie: Adjust the weight of the underlying asset to always equal ΔPrice/ΔValue aka the elasticity or ‘omega’ of the derivative.
More on Liquidity Provider Returns in Geometric Mean Markets.
Safeguards - Halting trading
Unlike finalized pools in Uniswap or Balancer, trading in Pie Smart Pools can be halted. Emergency transactions can be prepared via a vote of DAO token holders and broadcast in the future under specific conditions that require trading to be halted.
These transactions can be triggered based on multiple conditions by bots monitoring the mempool for abnormal behavior regarding the price and total supply of the underlying assets, in order to minimize the risk of a single asset collapse draining the entire pool.
Over time, we believe live risk statistics and predictive analysis regarding the likelihood of a specific asset defaulting will be essential tools for liquidity pools to succeed.
Safeguards - Capped Pools
Pie Smart Pools can include a maximum cap for experimental pools.
Parameters to Govern
Pie Smart Pools have a range of parameters governed by DOUGH holders.
Pie Swap Fee
Pie Weights Function
Pie Trading Switch
Pie Flash Loan Fee
Pie Single asset entry/exit Fee
Pie Management Fee
Pie Cap Value
Pie Implementation Address
Dev Docs - Previous
Pies (PieVaults)
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