diff --git a/uniswap/uniswap.py b/uniswap/uniswap.py
index 5edbc85..183c349 100644
--- a/uniswap/uniswap.py
+++ b/uniswap/uniswap.py
@@ -1403,7 +1403,7 @@ def approve(self, token: AddressLike, max_approval: Optional[int] = None) -> Non
         tx = self._build_and_send_tx(function)
         self.w3.eth.wait_for_transaction_receipt(tx, timeout=6000)
 
-        # Add extra sleep to let tx propogate correctly
+        # Add extra sleep to let tx propagate correctly
         time.sleep(1)
 
     def _is_approved(self, token: AddressLike) -> bool:
@@ -1413,6 +1413,8 @@ def _is_approved(self, token: AddressLike) -> bool:
             contract_addr = self._exchange_address_from_token(token)
         elif self.version in [2, 3]:
             contract_addr = self.router_address
+        else:
+            raise ValueError
         amount = (
             _load_contract_erc20(self.w3, token)
             .functions.allowance(self.address, contract_addr)
diff --git a/uniswap/util.py b/uniswap/util.py
index 814ec9d..888aa39 100644
--- a/uniswap/util.py
+++ b/uniswap/util.py
@@ -99,6 +99,39 @@ def encode_sqrt_ratioX96(amount_0: int, amount_1: int) -> int:
     return int(math.sqrt(ratioX192))
 
 
+def decode_sqrt_ratioX96(sqrtPriceX96: int) -> float:
+    Q96 = 2**96
+    ratio = sqrtPriceX96 / Q96
+    price = ratio**2
+    return price
+
+
+def get_tick_at_sqrt(sqrtPriceX96: int) -> int:
+    sqrtPriceX96 = int(sqrtPriceX96)
+
+    # Define constants
+    Q96 = 2**96
+
+    # Calculate the price from the sqrt ratio
+    ratio = sqrtPriceX96 / Q96
+    price = ratio**2
+
+    # Calculate the natural logarithm of the price
+    logPrice = math.log(price)
+
+    # Calculate the log base 1.0001 of the price
+    logBase = math.log(1.0001)
+    tick = logPrice / logBase
+
+    # Round tick to nearest integer
+    tick = int(round(tick))
+
+    # Ensure the tick is within the valid range
+    assert tick >= MIN_TICK and tick <= MAX_TICK
+
+    return tick
+
+
 # Adapted from: https://github.com/tradingstrategy-ai/web3-ethereum-defi/blob/c3c68bc723d55dda0cc8252a0dadb534c4fdb2c5/eth_defi/uniswap_v3/utils.py#L77
 def get_min_tick(fee: int) -> int:
     min_tick_spacing: int = _tick_spacing[fee]