chore: fix estimateGasFee math rounding issue (#397)

* chore: fix edge case for math rounding issue

* chore: refactor

* docs(changeset): chore: fix rounding issue for estimateGasFee api

.changeset/forty-birds-cheer.md

@@ -0,0 +1,5 @@
+---
+"@axelarjs/api": patch
+---
+
+chore: fix rounding issue for estimateGasFee api

packages/api/src/axelar-query/utils/bigint.spec.ts

@@ -29,4 +29,12 @@ describe("bigint", () => {
     const result = multiplyFloatByBigInt(floatNum, bigIntNum);
     expect(result).toEqual(1234n);
   });
+
+  it("should handle floating points result", () => {
+    const floatNum = 1.16;
+    const bigIntNum = 169973114000000n;
+
+    const result = multiplyFloatByBigInt(floatNum, bigIntNum);
+    expect(result).toEqual(197168812240000n);
+  });
 });

packages/api/src/axelar-query/utils/bigint.ts

@@ -44,8 +44,11 @@ export function multiplyFloatByBigInt(floatNum: number, bigIntNum: bigint) {
   // Scaling factor
   const scalingFactor = 10 ** decimalPlaces;
 
+  // Rounded multiplication of the float by the scaling factor
+  const scaledFloat = Math.round(floatNum * scalingFactor);
+
   // Convert float to scaled BigInt (as before)
-  const scaledBigInt = BigInt(floatNum * scalingFactor);
+  const scaledBigInt = BigInt(scaledFloat);
 
   // Perform the multiplication (both are now BigInts)
   const result = scaledBigInt * bigIntNum;