diff --git a/iota/api.py b/iota/api.py
index a932ab11..c7e3c4cf 100644
--- a/iota/api.py
+++ b/iota/api.py
@@ -894,7 +894,7 @@ def prepare_transfer(
     def promote_transaction(
             self,
             transaction,
-            depth,
+            depth=3,
             min_weight_magnitude=None,
     ):
         # type: (TransactionHash, int, Optional[int]) -> dict
@@ -921,7 +921,7 @@ def promote_transaction(
     def replay_bundle(
             self,
             transaction,
-            depth,
+            depth=3,
             min_weight_magnitude=None,
     ):
         # type: (TransactionHash, int, Optional[int]) -> dict
@@ -935,6 +935,7 @@ def replay_bundle(
 
         :param depth:
             Depth at which to attach the bundle.
+            Defaults to 3.
 
         :param min_weight_magnitude:
             Min weight magnitude, used by the node to calibrate Proof of
@@ -965,8 +966,8 @@ def replay_bundle(
 
     def send_transfer(
             self,
-            depth,  # type: int
             transfers,  # type: Iterable[ProposedTransaction]
+            depth=3,  # type: int
             inputs=None,  # type: Optional[Iterable[Address]]
             change_address=None,  # type: Optional[Address]
             min_weight_magnitude=None,  # type: Optional[int]
@@ -978,12 +979,13 @@ def send_transfer(
         attaches the bundle to the Tangle, and broadcasts and stores the
         transactions.
 
-        :param depth:
-            Depth at which to attach the bundle.
-
         :param transfers:
             Transfers to include in the bundle.
 
+        :param depth:
+            Depth at which to attach the bundle.
+            Defaults to 3.
+
         :param inputs:
             List of inputs used to fund the transfer.
             Not needed for zero-value transfers.
@@ -1035,7 +1037,7 @@ def send_transfer(
             securityLevel=security_level,
         )
 
-    def send_trytes(self, trytes, depth, min_weight_magnitude=None):
+    def send_trytes(self, trytes, depth=3, min_weight_magnitude=None):
         # type: (Iterable[TransactionTrytes], int, Optional[int]) -> dict
         """
         Attaches transaction trytes to the Tangle, then broadcasts and
@@ -1046,6 +1048,7 @@ def send_trytes(self, trytes, depth, min_weight_magnitude=None):
 
         :param depth:
             Depth at which to attach the bundle.
+            Defaults to 3.
 
         :param min_weight_magnitude:
             Min weight magnitude, used by the node to calibrate Proof of