Merge pull request #38 from darkforestry/fix/v2-amount-out

Updated v2 swap fee to be dynamic
darkforestry · Jun 20, 2023 · 171d7ea · 171d7ea
2 parents 6861201 + 4fc1fde
commit 171d7ea
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/src/amm/uniswap_v2/mod.rs b/src/amm/uniswap_v2/mod.rs
@@ -353,8 +353,8 @@ impl UniswapV2Pool {
         if amount_in.is_zero() || reserve_in.is_zero() || reserve_out.is_zero() {
             return U256::zero();
         }
-
-        let amount_in_with_fee = amount_in * U256::from(997);
+        let fee = (10000 - (self.fee / 10)) / 10; //Fee of 300 => (10,000 - 30) / 10  = 997
+        let amount_in_with_fee = amount_in * U256::from(fee);
         let numerator = amount_in_with_fee * reserve_out;
         let denominator = reserve_in * U256::from(1000) + amount_in_with_fee;