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Uniswap’s past work includes smart contract development on and formal verification of multi-collateral DAI.
The scope of work includes: 1. Formal verification of the core smart contracts. 2. Code review of core smart contracts. 3. Numerical error analysis. 4. Code review of periphery smart contracts (during ongoing development).
Uniswap incentivizes users to add liquidity to pools by rewarding providers with fees on trades. Market making, in general, is a complex activity which has the risk of losing money (compared to just holding) in the case of big directional moves of the underlying asset price.
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Uniswap is an automated liquidity protocol powered by a constant product formula and implemented in a system of non-upgradeable smart contracts on the Ethereum blockchain. It obviates the need for trusted intermediaries, prioritizing decentralization, censorship resistance, and security. Uniswap is open-source software licensed under the GPL.
Pairs act as automated market makers, standing ready to accept one token for the other as long as the “constant product” formula is preserved. This formula, most simply expressed as x * y = k, states that trades must not change the product (k) of a pair’s reserve balances (x and y).
Because k remains unchanged from the reference frame of a trade, it is often referred to as the invariant. This formula has the desirable property that larger trades (relative to reserves) execute at exponentially worse rates than smaller ones.
In practice, Uniswap applies a 0.30% fee to trades, which is added to reserves. As a result, each trade actually increases k. This functions as a payout to LPs, which is realized when they burn their pool tokens to withdraw their portion of total reserves. In the future, this fee may be reduced to 0.25%, with the remaining 0.05% withheld as a protocol-wide charge.
On November 2, 2018, Uniswap was publicly announced and deployed to the Ethereum mainnet. From October to November they built a proof-of-concept, including a smart contract and my very first website. The contract had a single liquidity provider and allowed simple swaps.
They also began to see the UX implications of automated market makers. At the time, EtherDelta was the only decentralized exchange with traction, but the UX felt messy and unintuitive.By late January 2018, all major smart contract issues had been solved.
Exchange contracts could support multiple liquidity providers by using an internal liquidity token to track each LP’s share of generated fees and the underlying collateral.
A factory contract allowed anyone to add support for a token. All tokens were paired with ETH allowing it to be used as an intermediary for anything-to-anything swaps in a single transaction.By March, 2018, they had built a fully featured demo of Uniswap.
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Each Uniswap smart contract, or pair, manages a liquidity pool made up of reserves of two ERC-20 tokens.Anyone can become a liquidity provider for a pool by depositing an equivalent value of each underlying token in return for pool tokens. These tokens track pro-rata LP shares of the total reserves, and can be redeemed for the underlying assets at any time.
The Uniswap ecosystem consists primarily of three types of users: liquidity providers, traders, and developers. Liquidity providers are incentivized to contribute ERC-20 tokens to common liquidity pools. Traders can swap these tokens for one another for a fixed 0.3%fee (which goes to liquidity providers).
Developers can integrate directly with Uniswap smart contracts to power new and exciting interactions with tokens, trading interfaces, retail experiences, and more.In total, interactions between these classes create a positive feedback loop, fueling digital economies by defining a common language through which tokens can be pooled, traded and used.
Uniswap (UNI) is a token used for governance actions in the Uniswap protocol, a decentralized automated liquidity protocol built on Ethereum where halving is not possible. Typically, smart contracts which need tokens to perform some functionality require would-be interactors to first make an approval on the token contract, then call a function that in turn calls transferFrom on the token contract. This is not how V2 pairs accept tokens.
Instead, pairs check their token balances at the end of every interaction. Then, at the beginning of the next interaction, current balances are differenced against the stored values to determine the amount of tokens that were sent by the current interactor.
To ameliorate rounding errors and increase the theoretical minimum tick size for liquidity provision, pairs burn the first Minimum Liquidity pool tokens.
For the vast majority of pairs, this will represent a trivial value. The burning happens automatically during the first liquidity provision, after which point the total supply is forevermore bounded.
There is a 0.3% fee for swapping tokens. This fee is split by liquidity providers proportional to their contribution to liquidity reserves.Swapping fees are immediately deposited into liquidity reserves. This increases the value of liquidity tokens, functioning as a payout to all liquidity providers proportional to their share of the pool.
Fees are collected by burning liquidity tokens to remove a proportional share of the underlying reserves.Since fees are added to liquidity pools, the invariant increases at the end of every trade. Within a single transaction, the invariant represents token0_pool / token1_pool at the end of the previous transaction.
At the moment there are no protocol fees. However, it is possible for a 0.05% fee to be turned on in the future.In the future, it is possible that a protocol-wide charge of 0.05% per trade will take effect.This amount would not affect the fee paid by traders, but would affect the amount received by liquidity providers. Rather than calculating this charge on swaps, which would significantly increase gas costs for all users, the charge is instead calculated when liquidity is added or removed.
Each pair on Uniswap is actually underpinned by a liquidity pool. Liquidity pools are smart contracts that hold balances of two unique tokens and enforces rules around depositing and withdrawing them.
The primary rule is the constant product formula. When a token is withdrawn (bought), a proportional amount must be deposited (sold) to maintain the constant. The ratio of tokens in the pool, in combination with the constant product formula, ultimately determines the price that a swap executes at.
In Uniswap V1, trades are always executed at the “best possible” price, calculated at execution time. Somewhat confusingly, this calculation is actually accomplished with one of two different formulas, depending on whether the trade specifies an exact input or output amount.
Functionally, the difference between these two functions is miniscule, but the very existence of a difference increases conceptual complexity. Initial attempts to support both functions in V2 proved inelegant, and the decision was made to not provide any pricing functions in the core.
Instead, pairs directly check whether the invariant was satisfied (accounting for fees) after every trade. This means that rather than relying on a pricing function to also enforce the invariant, V2 pairs simply and transparently ensure their own safety, a nice separation of concerns.
One downstream benefit is that V2 pairs will more naturally support other flavors of trades which may emerge, (e.g. trading to a specific price at execution time).The good news is that the library provides a variety of functions designed to make this quite simple, and all swapping functions in the router are designed with this in mind.
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