diff --git a/src/WakuRlnV2.sol b/src/WakuRlnV2.sol
index e1275b1..8519e3c 100644
--- a/src/WakuRlnV2.sol
+++ b/src/WakuRlnV2.sol
@@ -82,12 +82,41 @@ contract WakuRlnV2 {
         LazyIMT.init(imtData, DEPTH);
     }
 
+    /// @notice Checks if a commitment is valid
+    /// @param idCommitment The idCommitment of the member
+    /// @return true if the commitment is valid, false otherwise
+    function isValidCommitment(uint256 idCommitment) public pure returns (bool) {
+        return idCommitment != 0 && idCommitment < Q;
+    }
+
+    /// @notice Checks if a user message limit is valid
+    /// @param userMessageLimit The user message limit
+    /// @return true if the user message limit is valid, false otherwise
+    function isValidUserMessageLimit(uint32 userMessageLimit) public view returns (bool) {
+        return userMessageLimit > 0 && userMessageLimit <= MAX_MESSAGE_LIMIT;
+    }
+
+    /// @notice Returns the rateCommitment of a member
+    /// @param index The index of the member
+    /// @return The rateCommitment of the member
+    function indexToCommitment(uint32 index) internal view returns (uint256) {
+        return imtData.elements[LazyIMT.indexForElement(0, index)];
+    }
+
+    /// @notice Returns the metadata of a member
+    /// @param idCommitment The idCommitment of the member
+    /// @return The metadata of the member (userMessageLimit, index, rateCommitment)
+    function idCommitmentToMetadata(uint256 idCommitment) public view returns (uint32, uint32, uint256) {
+        MembershipInfo memory member = memberInfo[idCommitment];
+        return (member.userMessageLimit, member.index, indexToCommitment(member.index));
+    }
+
     /// @notice Checks if a member exists
     /// @param idCommitment The idCommitment of the member
     /// @return true if the member exists, false otherwise
     function memberExists(uint256 idCommitment) public view returns (bool) {
-        MembershipInfo memory member = memberInfo[idCommitment];
-        return member.userMessageLimit > 0 && member.index >= 0;
+        (uint32 userMessageLimit, uint32 index, uint256 rateCommitment) = idCommitmentToMetadata(idCommitment);
+        return userMessageLimit > 0 && index >= 0 && rateCommitment != 0;
     }
 
     /// Allows a user to register as a member
@@ -120,35 +149,6 @@ contract WakuRlnV2 {
         idCommitmentIndex += 1;
     }
 
-    /// @notice Checks if a commitment is valid
-    /// @param idCommitment The idCommitment of the member
-    /// @return true if the commitment is valid, false otherwise
-    function isValidCommitment(uint256 idCommitment) public pure returns (bool) {
-        return idCommitment != 0 && idCommitment < Q;
-    }
-
-    /// @notice Checks if a user message limit is valid
-    /// @param userMessageLimit The user message limit
-    /// @return true if the user message limit is valid, false otherwise
-    function isValidUserMessageLimit(uint32 userMessageLimit) public view returns (bool) {
-        return userMessageLimit > 0 && userMessageLimit <= MAX_MESSAGE_LIMIT;
-    }
-
-    /// @notice Returns the rateCommitment of a member
-    /// @param index The index of the member
-    /// @return The rateCommitment of the member
-    function indexToCommitment(uint32 index) public view returns (uint256) {
-        return imtData.elements[LazyIMT.indexForElement(0, index)];
-    }
-
-    /// @notice Returns the metadata of a member
-    /// @param idCommitment The idCommitment of the member
-    /// @return The metadata of the member (userMessageLimit, index, rateCommitment)
-    function idCommitmentToMetadata(uint256 idCommitment) public view returns (uint32, uint32, uint256) {
-        MembershipInfo memory member = memberInfo[idCommitment];
-        return (member.userMessageLimit, member.index, indexToCommitment(member.index));
-    }
-
     /// @notice Returns the commitments of a range of members
     /// @param startIndex The start index of the range
     /// @param endIndex The end index of the range
diff --git a/test/WakuRlnV2.t.sol b/test/WakuRlnV2.t.sol
index e9102d5..6992eba 100644
--- a/test/WakuRlnV2.t.sol
+++ b/test/WakuRlnV2.t.sol
@@ -38,7 +38,6 @@ contract WakuRlnV2Test is Test {
         // kats from zerokit
         uint256 rateCommitment =
             4_699_387_056_273_519_054_140_667_386_511_343_037_709_699_938_246_587_880_795_929_666_834_307_503_001;
-        assertEq(w.indexToCommitment(0), rateCommitment);
         uint256[] memory commitments = w.getCommitments(0, 1);
         assertEq(commitments.length, 1);
         assertEq(commitments[index], rateCommitment);
@@ -71,6 +70,14 @@ contract WakuRlnV2Test is Test {
         assertEq(fetchedRateCommitment, rateCommitment);
     }
 
+    function test__IdCommitmentToMetadata__DoesntExist() external {
+        uint256 idCommitment = 2;
+        (uint32 userMessageLimit, uint32 index, uint256 rateCommitment) = w.idCommitmentToMetadata(idCommitment);
+        assertEq(userMessageLimit, 0);
+        assertEq(index, 0);
+        assertEq(rateCommitment, 0);
+    }
+
     function test__InvalidRegistration__InvalidIdCommitment__Zero() external {
         uint256 idCommitment = 0;
         uint32 userMessageLimit = 2;