diff --git a/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsCustodyDecoder.tjava b/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsCustodyDecoder.tjava
index 0e65ba0..fd1d635 100644
--- a/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsCustodyDecoder.tjava
+++ b/src/main/tjava/com/r35157/libs/jupiter/perps/impl/anchoridl/AnchorIdlJupiterPerpsCustodyDecoder.tjava
@@ -23,10 +23,6 @@ class AnchorIdlJupiterPerpsCustodyDecoder {
         return readPublicKey(data, MINT_OFFSET);
     }
 
-    BigInteger decodeCurrentCumulativeInterestRate(SolanaAccountInfo custodyAccountInfo) {
-        return null;
-    }
-
     private ΩSPLMintAddressΩ readPublicKey(
             byte[] data,
             int offset
@@ -47,9 +43,22 @@ class AnchorIdlJupiterPerpsCustodyDecoder {
     private static final int ANCHOR_DISCRIMINATOR_LENGTH = 8;
     private static final int PUBLIC_KEY_LENGTH = 32;
 
-    private static final int MINT_OFFSET =
-            ANCHOR_DISCRIMINATOR_LENGTH
-                    + PUBLIC_KEY_LENGTH; // pool
+    // Offsets:
+    //    8   discriminator
+    //   +32 pool
+    //   +32 mint
+    //   +32 token_account
+    //   +1  decimals
+    //   +1  is_stable
+    //   +45 oracle
+    //   +48 pricing
+    //   +7  permissions
+    //   +8  target_ratio_bps
+    //   +48 assets
+
+    private static final int MINT_OFFSET = ANCHOR_DISCRIMINATOR_LENGTH + PUBLIC_KEY_LENGTH;
+    private static final int FUNDING_RATE_STATE_OFFSET = 262;
+    private static final int CUMULATIVE_INTEREST_RATE_OFFSET = FUNDING_RATE_STATE_OFFSET;
 
     private static final Base58Codec base58 = new Base58CodecImpl();
 }
\ No newline at end of file