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The following sections describe some of the notable design decisions made in the Soroswap Protocol. These are safe to skip unless you're interested in gaining a deep technical understanding of how the protocol works under the hood, or writing smart contract integrations!
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. See the whitepaper for a justification of why this is the case, but the takeaway is that tokens must be transferred to the pair before calling any token-requiring method (the one exception to this rule is Flash Swaps).
The router fully supports interacting with any WETH pair via ETH.
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 totalSupply is forevermore bounded.