diff --git a/src/contracts/core/StakeRootCompendium.sol b/src/contracts/core/StakeRootCompendium.sol
index 5f2bb0eb98..14f2a137cf 100644
--- a/src/contracts/core/StakeRootCompendium.sol
+++ b/src/contracts/core/StakeRootCompendium.sol
@@ -473,6 +473,15 @@ contract StakeRootCompendium is StakeRootCompendiumStorage {
         return operatorSets.length;
     }
 
+    /// @inheritdoc IStakeRootCompendium
+    function getOperatorSetIndexAtTimestamp(OperatorSet memory operatorSet, uint32 timestamp)
+        external
+        view
+        returns (uint224)
+    {
+        return operatorSetToIndex[operatorSet.avs][operatorSet.operatorSetId].upperLookup(timestamp);
+    }
+
     /// @inheritdoc IStakeRootCompendium
     function getStakes(
         OperatorSet calldata operatorSet,
diff --git a/src/contracts/interfaces/IStakeRootCompendium.sol b/src/contracts/interfaces/IStakeRootCompendium.sol
index 5c0083b8ea..35588204c7 100644
--- a/src/contracts/interfaces/IStakeRootCompendium.sol
+++ b/src/contracts/interfaces/IStakeRootCompendium.sol
@@ -119,6 +119,17 @@ interface IStakeRootCompendium {
     /// @notice the number of stake root submissions
     function getNumStakeRootSubmissions() external view returns (uint256);
 
+    /**
+     * @notice returns the operatorSet at the given timestamp
+     * @param operatorSet the operatorSet to get the indec for
+     * @param timestamp the timestamp to get the index for
+     * @return index the index of the operatorSet
+     */
+    function getOperatorSetIndexAtTimestamp(OperatorSet memory operatorSet, uint32 timestamp)
+        external
+        view
+        returns (uint224);
+
     /**
      * @notice returns the delegated and slashable stakes for an operator in an operatorSet
      * @param operatorSet the operatorSet to get the stakes for