diff --git a/src/ape/api/providers.py b/src/ape/api/providers.py
index abde585077..bc8ba5c041 100644
--- a/src/ape/api/providers.py
+++ b/src/ape/api/providers.py
@@ -16,7 +16,7 @@
 
 from eth_pydantic_types import HexBytes
 from ethpm_types.abi import EventABI
-from pydantic import Field, computed_field, model_validator
+from pydantic import Field, computed_field, field_serializer, model_validator
 
 from ape.api.config import PluginConfig
 from ape.api.networks import NetworkAPI
@@ -40,6 +40,7 @@
     _create_raises_not_implemented_error,
     log_instead_of_fail,
     raises_not_implemented,
+    to_int,
 )
 from ape.utils.rpc import RPCHeaders
 
@@ -74,7 +75,7 @@ class BlockAPI(BaseInterfaceModel):
         default=EMPTY_BYTES32, alias="parentHash"
     )  # NOTE: genesis block has no parent hash
     """
-    The preceeding block's hash.
+    The preceding block's hash.
     """
 
     timestamp: HexInt
@@ -83,7 +84,7 @@ class BlockAPI(BaseInterfaceModel):
     NOTE: The pending block uses the current timestamp.
     """
 
-    _size: Optional[int] = None
+    _size: Optional[HexInt] = None
 
     @log_instead_of_fail(default="<BlockAPI>")
     def __repr__(self) -> str:
@@ -111,7 +112,6 @@ def validate_size(cls, values, handler):
         Saves it to a private member on this class and
         gets returned in computed field "size".
         """
-
         if isinstance(values, BlockAPI):
             size = values.size
 
@@ -125,10 +125,14 @@ def validate_size(cls, values, handler):
 
         model = handler(values)
         if size is not None:
-            model._size = size
+            model._size = to_int(size)
 
         return model
 
+    @field_serializer("size")
+    def serialize_size(self, value):
+        return to_int(value)
+
     @computed_field()  # type: ignore[misc]
     @cached_property
     def transactions(self) -> list[TransactionAPI]:
@@ -145,15 +149,14 @@ def transactions(self) -> list[TransactionAPI]:
 
     @computed_field()  # type: ignore[misc]
     @cached_property
-    def size(self) -> int:
+    def size(self) -> HexInt:
         """
         The size of the block in gas. Most of the time,
         this field is passed to the model at validation time,
-        but occassionally it is missing (like in `eth_subscribe:newHeads`),
+        but occasionally it is missing (like in `eth_subscribe:newHeads`),
         in which case it gets calculated if and only if the user
         requests it (or during serialization of this model to disk).
         """
-
         if self._size is not None:
             # The size was provided with the rest of the model
             # (normal).
diff --git a/tests/functional/test_block.py b/tests/functional/test_block.py
index 9a597db0d0..75a059472d 100644
--- a/tests/functional/test_block.py
+++ b/tests/functional/test_block.py
@@ -18,8 +18,9 @@ def test_block(eth_tester_provider, vyper_contract_instance):
     assert actual.number == data["number"]
 
 
-def test_block_dict(block):
-    actual = block.model_dump()
+@pytest.mark.parametrize("mode", ("json", "python"))
+def test_model_dump(block, mode):
+    actual = block.model_dump(mode=mode)
     expected = {
         "baseFeePerGas": 1000000000,
         "difficulty": 0,
@@ -38,7 +39,7 @@ def test_block_dict(block):
     assert actual == expected
 
 
-def test_block_json(block):
+def test_model_dump_json(block):
     actual = block.model_dump_json()
     expected = (
         '{"baseFeePerGas":1000000000,"difficulty":0,"gasLimit":30029122,"gasUsed":0,'
@@ -46,11 +47,33 @@ def test_block_json(block):
         '"num_transactions":0,"number":0,'
         f'"parentHash":"{to_hex(block.parent_hash)}",'
         f'"size":{block.size},"timestamp":{block.timestamp},'
-        f'"totalDifficulty":0,"transactions":[],"uncles":[]}}'
+        '"totalDifficulty":0,"transactions":[],"uncles":[]}'
     )
     assert actual == expected
 
 
+@pytest.mark.parametrize("size", (123, HexBytes(123), to_hex(123)))
+def test_size(block, size):
+    block._size = size
+    dictionary_python = block.model_dump(mode="python")
+    dictionary_json = block.model_dump(mode="json")
+    jons_str = block.model_dump_json()
+    assert dictionary_python["size"] == 123
+    assert dictionary_json["size"] == 123
+    assert '"size":123' in jons_str
+
+    # Show the same when validated with size in the model.
+    data = block.model_dump()
+    data["size"] = size
+    new_block = Block.model_validate(data)
+    dictionary_python = new_block.model_dump(mode="python")
+    dictionary_json = new_block.model_dump(mode="json")
+    jons_str = new_block.model_dump_json()
+    assert dictionary_python["size"] == 123
+    assert dictionary_json["size"] == 123
+    assert '"size":123' in jons_str
+
+
 def test_block_calculate_size(block):
     original = block.model_dump(by_alias=True)
     size = original.pop("size")