Pair Address
getPair
The most obvious way to get the address for a pair is to call getPair on the factory. If the pair exists, this function will return its address, else address(0) (0x0000000000000000000000000000000000000000).
The "canonical" way to determine whether or not a pair exists.
Requires an on-chain lookup.
CREATE2
Thanks to some fancy footwork in the factory, we can also compute pair addresses without any on-chain lookups because of CREATE2. The following values are required for this technique:
address | The factory address |
salt | keccak256(abi.encodePacked(token0, token1)) |
keccak256(init_code) | 0x96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f |
token0 must be strictly less than token1 by sort order.
Can be computed offline.
Requires the ability to perform keccak256.
Examples
Solidity
Last updated