diff --git a/src/ape/api/config.py b/src/ape/api/config.py
index c16b0c8890..80e5d3c86c 100644
--- a/src/ape/api/config.py
+++ b/src/ape/api/config.py
@@ -4,6 +4,8 @@
 from pydantic import ConfigDict
 from pydantic_settings import BaseSettings
 
+from ape.utils.basemodel import _assert_not_ipython_check
+
 ConfigItemType = TypeVar("ConfigItemType")
 
 
@@ -49,6 +51,8 @@ def update(root: Dict, value_map: Dict):
         return cls(**update(default_values, overrides))
 
     def __getattr__(self, attr_name: str) -> Any:
+        _assert_not_ipython_check(attr_name)
+
         # Allow hyphens in plugin config files.
         attr_name = attr_name.replace("-", "_")
         extra = self.__pydantic_extra__ or {}
diff --git a/src/ape/api/networks.py b/src/ape/api/networks.py
index 3eb11252b4..8554c3d1d9 100644
--- a/src/ape/api/networks.py
+++ b/src/ape/api/networks.py
@@ -290,7 +290,7 @@ def __post_init__(self):
     def __ape_extra_attributes__(self) -> Iterator[ExtraModelAttributes]:
         yield ExtraModelAttributes(
             name="networks",
-            attributes=self.networks,
+            attributes=lambda: self.networks,
             include_getattr=True,
             include_getitem=True,
         )
diff --git a/src/ape/api/projects.py b/src/ape/api/projects.py
index 55a36a8c4a..2fe6b21aaf 100644
--- a/src/ape/api/projects.py
+++ b/src/ape/api/projects.py
@@ -366,7 +366,7 @@ def __repr__(self):
     def __ape_extra_attributes__(self) -> Iterator[ExtraModelAttributes]:
         yield ExtraModelAttributes(
             name=self.name,
-            attributes=self.contracts,
+            attributes=lambda: self.contracts,
             include_getattr=True,
             include_getitem=True,
             additional_error_message="Do you have the necessary compiler plugins installed?",
diff --git a/src/ape/api/transactions.py b/src/ape/api/transactions.py
index 4aa77709b8..716bf7f8c7 100644
--- a/src/ape/api/transactions.py
+++ b/src/ape/api/transactions.py
@@ -275,7 +275,7 @@ def __repr__(self) -> str:
         return f"<{cls_name} {self.txn_hash}>"
 
     def __ape_extra_attributes__(self) -> Iterator[ExtraModelAttributes]:
-        yield ExtraModelAttributes(name="transaction", attributes=vars(self.transaction))
+        yield ExtraModelAttributes(name="transaction", attributes=lambda: vars(self.transaction))
 
     @field_validator("transaction", mode="before")
     @classmethod
diff --git a/src/ape/contracts/base.py b/src/ape/contracts/base.py
index f4d3baca92..face4bec4c 100644
--- a/src/ape/contracts/base.py
+++ b/src/ape/contracts/base.py
@@ -30,6 +30,7 @@
 from ape.types import AddressType, ContractLog, LogFilter, MockContractLog
 from ape.utils import BaseInterfaceModel, ManagerAccessMixin, cached_property, singledispatchmethod
 from ape.utils.abi import StructParser
+from ape.utils.basemodel import _assert_not_ipython_check
 
 
 class ContractConstructor(ManagerAccessMixin):
@@ -1163,7 +1164,7 @@ def __getattr__(self, attr_name: str) -> Any:
         Returns:
             Any: The return value from the contract call, or a transaction receipt.
         """
-
+        _assert_not_ipython_check(attr_name)
         if attr_name in set(super(BaseAddress, self).__dir__()):
             return super(BaseAddress, self).__getattribute__(attr_name)
 
@@ -1252,7 +1253,7 @@ def __getattr__(self, name: str) -> Any:
             :class:`~ape.types.ContractEvent` or a subclass of :class:`~ape.exceptions.CustomError`
             or any real attribute of the class.
         """
-
+        _assert_not_ipython_check(name)
         try:
             # First, check if requesting a regular attribute on this class.
             return self.__getattribute__(name)
@@ -1464,6 +1465,7 @@ def __getattr__(self, item: str) -> Union[ContractContainer, "ContractNamespace"
             Union[:class:`~ape.contracts.base.ContractContainer`,
             :class:`~ape.contracts.base.ContractNamespace`]
         """
+        _assert_not_ipython_check(item)
 
         def _get_name(cc: ContractContainer) -> str:
             return cc.contract_type.name or ""
diff --git a/src/ape/managers/base.py b/src/ape/managers/base.py
index e53bed9966..d485e6d2b9 100644
--- a/src/ape/managers/base.py
+++ b/src/ape/managers/base.py
@@ -5,3 +5,11 @@ class BaseManager(ManagerAccessMixin):
     """
     Base manager that allows us to add other IPython integration features
     """
+
+    def _repr_mimebundle_(self, include=None, exclude=None):
+        # This works better than AttributeError for Ape.
+        raise NotImplementedError("This manager does not implement '_repr_mimebundle_'.")
+
+    def _ipython_display_(self, include=None, exclude=None):
+        # This works better than AttributeError for Ape.
+        raise NotImplementedError("This manager does not implement '_ipython_display_'.")
diff --git a/src/ape/managers/compilers.py b/src/ape/managers/compilers.py
index 091eee371f..20a7cd2581 100644
--- a/src/ape/managers/compilers.py
+++ b/src/ape/managers/compilers.py
@@ -9,7 +9,8 @@
 from ape.exceptions import ApeAttributeError, CompilerError, ContractLogicError
 from ape.logging import logger
 from ape.managers.base import BaseManager
-from ape.utils import get_relative_path
+from ape.utils.basemodel import _assert_not_ipython_check
+from ape.utils.os import get_relative_path
 
 
 class CompilerManager(BaseManager):
@@ -33,6 +34,8 @@ def __repr__(self):
         return f"<{cls_name} len(registered_compilers)={num_compilers}>"
 
     def __getattr__(self, name: str) -> Any:
+        _assert_not_ipython_check(name)
+
         try:
             return self.__getattribute__(name)
         except AttributeError:
diff --git a/src/ape/managers/networks.py b/src/ape/managers/networks.py
index 0c5077b33a..eb650b5cb2 100644
--- a/src/ape/managers/networks.py
+++ b/src/ape/managers/networks.py
@@ -13,6 +13,7 @@
     NetworkNotFoundError,
 )
 from ape.managers.base import BaseManager
+from ape.utils.basemodel import _assert_not_ipython_check
 from ape.utils.misc import _dict_overlay
 from ape_ethereum.provider import EthereumNodeProvider
 
@@ -303,7 +304,7 @@ def __getattr__(self, attr_name: str) -> EcosystemAPI:
 
             eth = networks.ethereum
         """
-
+        _assert_not_ipython_check(attr_name)
         options = {attr_name, attr_name.replace("-", "_"), attr_name.replace("_", "-")}
         ecosystems = self.ecosystems
         for opt in options:
diff --git a/src/ape/managers/project/manager.py b/src/ape/managers/project/manager.py
index f7c9604fd1..aa4f854189 100644
--- a/src/ape/managers/project/manager.py
+++ b/src/ape/managers/project/manager.py
@@ -16,6 +16,7 @@
 from ape.managers.base import BaseManager
 from ape.managers.project.types import ApeProject, BrownieProject
 from ape.utils import get_relative_path
+from ape.utils.basemodel import _assert_not_ipython_check
 
 
 class ProjectManager(BaseManager):
@@ -56,6 +57,15 @@ def __init__(
     def __str__(self) -> str:
         return f'Project("{self.path}")'
 
+    def __repr__(self):
+        try:
+            path = f" {self.path}"
+        except Exception:
+            # Disallow exceptions in __repr__
+            path = ""
+
+        return f"<ProjectManager{path}>"
+
     @property
     def dependencies(self) -> Dict[str, Dict[str, DependencyAPI]]:
         """
@@ -481,7 +491,7 @@ def __getattr__(self, attr_name: str) -> Any:
             :class:`~ape.contracts.ContractContainer`,
             a :class:`~ape.contracts.ContractNamespace`, or any attribute.
         """
-
+        _assert_not_ipython_check(attr_name)
         result = self._get_attr(attr_name)
         if result:
             return result
@@ -526,6 +536,7 @@ def _get_attr(self, attr_name: str) -> Any:
         try:
             return self.__getattribute__(attr_name)
         except AttributeError:
+            # NOTE: Also handles IPython attributes such as _ipython_display_
             if not self._getattr_contracts:
                 # Raise the attribute error as if this method didn't exist.
                 raise
diff --git a/src/ape/plugins/__init__.py b/src/ape/plugins/__init__.py
index a18f296eca..b6d299bba7 100644
--- a/src/ape/plugins/__init__.py
+++ b/src/ape/plugins/__init__.py
@@ -7,6 +7,7 @@
 from ape.__modules__ import __modules__
 from ape.exceptions import ApeAttributeError
 from ape.logging import logger
+from ape.utils.basemodel import _assert_not_ipython_check
 
 from .account import AccountPlugin
 from .compiler import CompilerPlugin
@@ -128,6 +129,8 @@ def __repr__(self):
         return f"<{PluginManager.__name__}>"
 
     def __getattr__(self, attr_name: str) -> Iterator[Tuple[str, Tuple]]:
+        _assert_not_ipython_check(attr_name)
+
         # NOTE: The first time this method is called, the actual
         #  plugin registration occurs. Registration only happens once.
         self._register_plugins()
diff --git a/src/ape/utils/basemodel.py b/src/ape/utils/basemodel.py
index c32be09340..ad9227e2de 100644
--- a/src/ape/utils/basemodel.py
+++ b/src/ape/utils/basemodel.py
@@ -160,6 +160,9 @@ def _get_alt(name: str) -> Optional[str]:
     return alt
 
 
+_ATTR_TYPE = Union[Dict[str, Any], RootBaseModel]
+
+
 class ExtraModelAttributes(EthpmTypesBaseModel):
     """
     A class for defining extra model attributes.
@@ -174,7 +177,7 @@ class ExtraModelAttributes(EthpmTypesBaseModel):
     we can show a more accurate exception message.
     """
 
-    attributes: Union[Dict[str, Any], RootBaseModel]
+    attributes: Union[_ATTR_TYPE, Callable[[], _ATTR_TYPE]]
     """The attributes."""
 
     include_getattr: bool = True
@@ -190,16 +193,12 @@ class ExtraModelAttributes(EthpmTypesBaseModel):
     """
 
     def __contains__(self, name: str) -> bool:
-        attr_dict = (
-            self.attributes
-            if isinstance(self.attributes, dict)
-            else self.attributes.model_dump(by_alias=False)
-        )
-        if name in attr_dict:
+        attrs = self._attrs()
+        if name in attrs:
             return True
 
         elif alt := _get_alt(name):
-            return alt in attr_dict
+            return alt in attrs
 
         return False
 
@@ -226,11 +225,17 @@ def get(self, name: str) -> Optional[Any]:
         return None
 
     def _get(self, name: str) -> Optional[Any]:
-        return (
-            self.attributes.get(name)
-            if isinstance(self.attributes, dict)
-            else getattr(self.attributes, name, None)
-        )
+        return self._attrs().get(name)
+
+    def _attrs(self) -> dict:
+        if isinstance(self.attributes, dict):
+            return self.attributes
+        elif isinstance(self.attributes, RootBaseModel):
+            return self.attributes.model_dump(by_alias=False)
+
+        # Lazy extras.
+        result = self.attributes()
+        return result if isinstance(result, dict) else result.model_dump(by_alias=False)
 
 
 class BaseModel(EthpmTypesBaseModel):
@@ -256,6 +261,20 @@ def model_copy(
 
         return result
 
+    def _repr_mimebundle_(self, include=None, exclude=None):
+        # This works better than AttributeError for Ape.
+        raise NotImplementedError("This model does not implement '_repr_mimebundle_'.")
+
+    def _ipython_display_(self, include=None, exclude=None):
+        # This works better than AttributeError for Ape.
+        raise NotImplementedError("This model does not implement '_ipython_display_'.")
+
+
+def _assert_not_ipython_check(key):
+    # Perf: IPython expects AttributeError here.
+    if isinstance(key, str) and key == "_ipython_canary_method_should_not_exist_":
+        raise AttributeError()
+
 
 class ExtraAttributesMixin:
     """
@@ -280,7 +299,7 @@ def __getattr__(self, name: str) -> Any:
         An overridden ``__getattr__`` implementation that takes into
         account :meth:`~ape.utils.basemodel.ExtraAttributesMixin.__ape_extra_attributes__`.
         """
-
+        _assert_not_ipython_check(name)
         private_attrs = self.__pydantic_private__ or {}
         if name in private_attrs:
             _recursion_checker.reset()
diff --git a/src/ape_ethereum/ecosystem.py b/src/ape_ethereum/ecosystem.py
index 753e422245..411b705eba 100644
--- a/src/ape_ethereum/ecosystem.py
+++ b/src/ape_ethereum/ecosystem.py
@@ -48,6 +48,7 @@
     returns_array,
     to_int,
 )
+from ape.utils.basemodel import _assert_not_ipython_check
 from ape.utils.misc import DEFAULT_MAX_RETRIES_TX, DEFAULT_TRANSACTION_TYPE
 from ape_ethereum.proxies import (
     IMPLEMENTATION_ABI,
@@ -220,6 +221,7 @@ def local(self) -> NetworkConfig:
         )
 
     def __getattr__(self, key: str) -> Any:
+        _assert_not_ipython_check(key)
         net_key = key.replace("-", "_")
         if net_key.endswith("_fork"):
             return self._get_forked_config(net_key)
diff --git a/tests/functional/test_project.py b/tests/functional/test_project.py
index 7b0c5ce9b3..01d17e31dd 100644
--- a/tests/functional/test_project.py
+++ b/tests/functional/test_project.py
@@ -443,6 +443,23 @@ def test_getattr_contract_not_exists(project):
         _ = project.ThisIsNotAContractThatExists
 
 
+@pytest.mark.parametrize("iypthon_attr_name", ("_repr_mimebundle_", "_ipython_display_"))
+def test_getattr_ipython(mocker, project, iypthon_attr_name):
+    spy = mocker.spy(project, "_get_contract")
+    getattr(project, iypthon_attr_name)
+    # Ensure it does not try to do anything with contracts.
+    assert spy.call_count == 0
+
+
+def test_getattr_ipython_canary_check(mocker, project):
+    spy = mocker.spy(project, "_get_contract")
+    with pytest.raises(AttributeError):
+        getattr(project, "_ipython_canary_method_should_not_exist_")
+
+    # Ensure it does not try to do anything with contracts.
+    assert spy.call_count == 0
+
+
 def test_build_file_only_modified_once(project_with_contract):
     project = project_with_contract
     artifact = project.path / ".build" / "__local__.json"