diff --git a/src/main/java/io/zksync/signer/SigningUtils.java b/src/main/java/io/zksync/signer/SigningUtils.java
index 8045e6a..ec158ba 100644
--- a/src/main/java/io/zksync/signer/SigningUtils.java
+++ b/src/main/java/io/zksync/signer/SigningUtils.java
@@ -254,21 +254,21 @@ private static byte[] packAmountChecked(BigInteger amount) {
         return packAmount(amount);
     }
 
-    private static BigInteger closestPackableTransactionFee(BigInteger fee) {
+    public static BigInteger closestPackableTransactionFee(BigInteger fee) {
         final byte[] packedFee = packFee(fee);
         return decimalByteArrayToInteger(packedFee, FEE_EXPONENT_BIT_WIDTH, FEE_MANTISSA_BIT_WIDTH, 10);
     }
 
-    private static BigInteger closestPackableTransactionAmount(BigInteger amount) {
+    public static BigInteger closestPackableTransactionAmount(BigInteger amount) {
         final byte[] packedAmount = packAmount(amount);
         return decimalByteArrayToInteger(packedAmount, AMOUNT_EXPONENT_BIT_WIDTH, AMOUNT_MANTISSA_BIT_WIDTH, 10);
     }
 
-    private static byte[] packFee(BigInteger fee) {
+    public static byte[] packFee(BigInteger fee) {
         return reverseBits(integerToDecimalByteArray(fee, FEE_EXPONENT_BIT_WIDTH, FEE_MANTISSA_BIT_WIDTH, 10));
     }
 
-    private static byte[] packAmount(BigInteger amount) {
+    public static byte[] packAmount(BigInteger amount) {
         return reverseBits(integerToDecimalByteArray(amount, AMOUNT_EXPONENT_BIT_WIDTH, AMOUNT_MANTISSA_BIT_WIDTH, 10));
     }