diff --git a/.github/workflows/python-x402-a2a.yml b/.github/workflows/python-x402-a2a.yml
index 8651a81..40369c0 100644
--- a/.github/workflows/python-x402-a2a.yml
+++ b/.github/workflows/python-x402-a2a.yml
@@ -33,3 +33,6 @@ jobs:
 
       - name: Format
         run: uvx ruff format --check .
+
+      - name: Typecheck
+        run: uv run typecheck
diff --git a/python/examples/adk-demo/client_agent/client_agent.py b/python/examples/adk-demo/client_agent/client_agent.py
index 17057c7..afd48b1 100644
--- a/python/examples/adk-demo/client_agent/client_agent.py
+++ b/python/examples/adk-demo/client_agent/client_agent.py
@@ -36,7 +36,7 @@
 from ._remote_agent_connection import RemoteAgentConnections, TaskUpdateCallback
 from .wallet import Wallet
 from x402_a2a.core.utils import x402Utils
-from x402_a2a.types import PaymentStatus
+from x402_a2a.type_defs import PaymentStatus
 
 logger = logging.getLogger(__name__)
 
diff --git a/python/examples/adk-demo/client_agent/wallet.py b/python/examples/adk-demo/client_agent/wallet.py
index 951015e..55d56b4 100644
--- a/python/examples/adk-demo/client_agent/wallet.py
+++ b/python/examples/adk-demo/client_agent/wallet.py
@@ -14,7 +14,7 @@
 from abc import ABC, abstractmethod
 import eth_account
 
-from x402_a2a.types import PaymentPayload, x402PaymentRequiredResponse
+from x402_a2a.type_defs import PaymentPayload, x402PaymentRequiredResponse
 from x402_a2a.core.wallet import process_payment_required
 
 
diff --git a/python/examples/adk-demo/server/agents/_adk_agent_executor.py b/python/examples/adk-demo/server/agents/_adk_agent_executor.py
index 3dce97a..7ceb247 100644
--- a/python/examples/adk-demo/server/agents/_adk_agent_executor.py
+++ b/python/examples/adk-demo/server/agents/_adk_agent_executor.py
@@ -36,7 +36,7 @@
 from google.genai import types
 
 from x402_a2a.core.utils import x402Utils
-from x402_a2a.types import x402PaymentRequiredException
+from x402_a2a.type_defs import x402PaymentRequiredException
 
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.DEBUG)
diff --git a/python/examples/adk-demo/server/agents/adk_merchant_agent.py b/python/examples/adk-demo/server/agents/adk_merchant_agent.py
index 8851af4..b7c7766 100644
--- a/python/examples/adk-demo/server/agents/adk_merchant_agent.py
+++ b/python/examples/adk-demo/server/agents/adk_merchant_agent.py
@@ -18,11 +18,11 @@
 from google.adk.agents import LlmAgent
 from google.adk.agents.callback_context import CallbackContext
 from google.genai import types
-from x402_a2a.types import PaymentRequirements
+from x402_a2a.type_defs import PaymentRequirements
 
 # Import the custom exception and the base agent interface
 from .base_agent import BaseAgent
-from x402_a2a.types import x402PaymentRequiredException
+from x402_a2a.type_defs import x402PaymentRequiredException
 from x402_a2a import x402Utils, get_extension_declaration
 
 # This is the new, clean ADK Merchant Agent.
diff --git a/python/examples/adk-demo/server/agents/mock_facilitator.py b/python/examples/adk-demo/server/agents/mock_facilitator.py
index 756f9be..0c8d00a 100644
--- a/python/examples/adk-demo/server/agents/mock_facilitator.py
+++ b/python/examples/adk-demo/server/agents/mock_facilitator.py
@@ -14,7 +14,7 @@
 import logging
 from typing import override
 
-from x402_a2a.types import (
+from x402_a2a.type_defs import (
     ExactPaymentPayload,
     PaymentPayload,
     PaymentRequirements,
diff --git a/python/examples/adk-demo/server/agents/x402_merchant_executor.py b/python/examples/adk-demo/server/agents/x402_merchant_executor.py
index 3a9b95d..3e34f37 100644
--- a/python/examples/adk-demo/server/agents/x402_merchant_executor.py
+++ b/python/examples/adk-demo/server/agents/x402_merchant_executor.py
@@ -20,7 +20,7 @@
 
 from x402_a2a.executors import x402ServerExecutor
 from .mock_facilitator import MockFacilitator
-from x402_a2a.types import (
+from x402_a2a.type_defs import (
     PaymentPayload,
     PaymentRequirements,
     SettleResponse,
diff --git a/python/examples/adk-demo/uv.lock b/python/examples/adk-demo/uv.lock
index 5453fd8..7d54caf 100644
--- a/python/examples/adk-demo/uv.lock
+++ b/python/examples/adk-demo/uv.lock
@@ -60,7 +60,7 @@ requires-dist = [
     { name = "uvicorn", specifier = ">=0.34.2" },
     { name = "web3", specifier = ">=7.10.0" },
     { name = "x402", specifier = ">=0.1.4" },
-    { name = "x402-a2a", editable = "../../../python/x402_a2a" },
+    { name = "x402-a2a", editable = "../../x402_a2a" },
 ]
 
 [package.metadata.requires-dev]
@@ -2714,7 +2714,7 @@ wheels = [
 [[package]]
 name = "x402-a2a"
 version = "1.0.0"
-source = { editable = "../../../python/x402_a2a" }
+source = { editable = "../../x402_a2a" }
 dependencies = [
     { name = "a2a-sdk" },
     { name = "eth-account" },
@@ -2742,7 +2742,10 @@ dev = [
     { name = "pytest-mock", specifier = ">=3.14.1" },
     { name = "trio", specifier = ">=0.22.0" },
 ]
-lint = [{ name = "ruff", specifier = ">=0.13.1" }]
+lint = [
+    { name = "mypy", specifier = ">=1.8.0" },
+    { name = "ruff", specifier = ">=0.13.1" },
+]
 
 [[package]]
 name = "yarl"
diff --git a/python/x402_a2a/__init__.py b/python/x402_a2a/__init__.py
index 8e7fd37..986f0c9 100644
--- a/python/x402_a2a/__init__.py
+++ b/python/x402_a2a/__init__.py
@@ -31,7 +31,7 @@
 from x402.facilitator import FacilitatorConfig, FacilitatorClient
 
 # A2A Extension Types & Functions
-from .types import (
+from .type_defs import (
     # Extension Constants
     X402_EXTENSION_URI,
     # A2A-Specific Types
diff --git a/python/x402_a2a/core/agent.py b/python/x402_a2a/core/agent.py
index 93c3783..a092467 100644
--- a/python/x402_a2a/core/agent.py
+++ b/python/x402_a2a/core/agent.py
@@ -16,7 +16,7 @@
 from typing import List, Optional
 from a2a.types import AgentCard, AgentCapabilities
 
-from ..types import x402ExtensionConfig, get_extension_declaration
+from ..type_defs import x402ExtensionConfig, get_extension_declaration
 
 
 def create_x402_agent_card(
diff --git a/python/x402_a2a/core/helpers.py b/python/x402_a2a/core/helpers.py
index e4c2d37..65469da 100644
--- a/python/x402_a2a/core/helpers.py
+++ b/python/x402_a2a/core/helpers.py
@@ -16,7 +16,7 @@
 from typing import Union, Optional, List, Callable, Any
 from functools import wraps
 
-from ..types import x402PaymentRequiredException, PaymentRequirements, TokenAmount
+from ..type_defs import x402PaymentRequiredException, PaymentRequirements, TokenAmount
 from .merchant import create_payment_requirements
 
 
diff --git a/python/x402_a2a/core/merchant.py b/python/x402_a2a/core/merchant.py
index a41af5f..fdd88b3 100644
--- a/python/x402_a2a/core/merchant.py
+++ b/python/x402_a2a/core/merchant.py
@@ -16,7 +16,7 @@
 from typing import Optional, Any, cast
 from x402.common import process_price_to_atomic_amount
 from x402.types import Price
-from ..types import PaymentRequirements, SupportedNetworks
+from ..type_defs import PaymentRequirements, SupportedNetworks
 
 
 def create_payment_requirements(
diff --git a/python/x402_a2a/core/protocol.py b/python/x402_a2a/core/protocol.py
index 738e75d..8e41bd9 100644
--- a/python/x402_a2a/core/protocol.py
+++ b/python/x402_a2a/core/protocol.py
@@ -15,7 +15,7 @@
 
 from typing import Optional
 
-from ..types import (
+from ..type_defs import (
     PaymentPayload,
     PaymentRequirements,
     SettleResponse,
diff --git a/python/x402_a2a/core/utils.py b/python/x402_a2a/core/utils.py
index 45841a5..dd5e6ad 100644
--- a/python/x402_a2a/core/utils.py
+++ b/python/x402_a2a/core/utils.py
@@ -16,7 +16,7 @@
 import logging
 import uuid
 from typing import Optional
-from ..types import (
+from ..type_defs import (
     Task,
     Message,
     PaymentStatus,
@@ -181,7 +181,7 @@ def create_payment_required_task(
 
         # Ensure task has a status message for metadata
         if not hasattr(task.status, "message") or not task.status.message:
-            from ..types import Message
+            from ..type_defs import Message
             from a2a.types import TextPart
 
             task.status.message = Message(
@@ -215,7 +215,7 @@ def record_payment_verified(
         """Record payment verification in task metadata."""
         # Ensure task has a status message for metadata
         if not hasattr(task.status, "message") or not task.status.message:
-            from ..types import Message
+            from ..type_defs import Message
             from a2a.types import TextPart
 
             task.status.message = Message(
@@ -243,7 +243,7 @@ def record_payment_success(
         """Record successful payment with settlement response."""
         # Ensure task has a status message for metadata
         if not hasattr(task.status, "message") or not task.status.message:
-            from ..types import Message
+            from ..type_defs import Message
             from a2a.types import TextPart
 
             task.status.message = Message(
@@ -280,7 +280,7 @@ def record_payment_failure(
         """Record payment failure with error details."""
         # Ensure task has a status message for metadata
         if not hasattr(task.status, "message") or not task.status.message:
-            from ..types import Message
+            from ..type_defs import Message
             from a2a.types import TextPart
 
             task.status.message = Message(
diff --git a/python/x402_a2a/core/wallet.py b/python/x402_a2a/core/wallet.py
index 7fd87ae..73e260e 100644
--- a/python/x402_a2a/core/wallet.py
+++ b/python/x402_a2a/core/wallet.py
@@ -19,7 +19,7 @@
 from x402.common import x402_VERSION
 from x402.exact import prepare_payment_header, sign_payment_header, decode_payment
 
-from ..types import (
+from ..type_defs import (
     PaymentRequirements,
     x402PaymentRequiredResponse,
     PaymentPayload,
diff --git a/python/x402_a2a/executors/base.py b/python/x402_a2a/executors/base.py
index 32b14a6..aa3bc2f 100644
--- a/python/x402_a2a/executors/base.py
+++ b/python/x402_a2a/executors/base.py
@@ -15,7 +15,7 @@
 
 from abc import ABC, abstractmethod
 
-from ..types import (
+from ..type_defs import (
     AgentExecutor,
     RequestContext,
     EventQueue,
diff --git a/python/x402_a2a/executors/client.py b/python/x402_a2a/executors/client.py
index 5283dde..2466511 100644
--- a/python/x402_a2a/executors/client.py
+++ b/python/x402_a2a/executors/client.py
@@ -17,7 +17,7 @@
 from eth_account import Account
 
 from .base import x402BaseExecutor
-from ..types import (
+from ..type_defs import (
     AgentExecutor,
     RequestContext,
     EventQueue,
@@ -99,7 +99,7 @@ async def _auto_pay(self, task, event_queue: EventQueue):
 
         except Exception as e:
             # Payment processing failed
-            from ..types import SettleResponse, x402ErrorCode
+            from ..type_defs import SettleResponse, x402ErrorCode
 
             failure_response = SettleResponse(
                 success=False, network="base", error_reason=f"Payment failed: {e}"
diff --git a/python/x402_a2a/executors/server.py b/python/x402_a2a/executors/server.py
index 7197f32..272e5c8 100644
--- a/python/x402_a2a/executors/server.py
+++ b/python/x402_a2a/executors/server.py
@@ -20,7 +20,7 @@
 from a2a.server.tasks import TaskUpdater
 
 from .base import x402BaseExecutor
-from ..types import (
+from ..type_defs import (
     AgentExecutor,
     RequestContext,
     EventQueue,
diff --git a/python/x402_a2a/extension.py b/python/x402_a2a/extension.py
index 5b24b02..544718b 100644
--- a/python/x402_a2a/extension.py
+++ b/python/x402_a2a/extension.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 """Extension declaration and constants for A2A x402 protocol."""
 
-from .types.config import X402_EXTENSION_URI
+from .type_defs.config import X402_EXTENSION_URI
 
 
 def get_extension_declaration(
diff --git a/python/x402_a2a/pyproject.toml b/python/x402_a2a/pyproject.toml
index c660f10..5ac1137 100644
--- a/python/x402_a2a/pyproject.toml
+++ b/python/x402_a2a/pyproject.toml
@@ -28,17 +28,19 @@ dev = [
 ]
 lint = [
     "ruff>=0.13.1",
+    "mypy>=1.8.0",
 ]
 
 [project.scripts]
 test = "pytest:main"
+typecheck = "mypy.main:main"
 
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
-force-include = { "__init__.py" = "x402_a2a/__init__.py", "core" = "x402_a2a/core", "executors" = "x402_a2a/executors", "types" = "x402_a2a/types", "extension.py" = "x402_a2a/extension.py" }
+force-include = { "__init__.py" = "x402_a2a/__init__.py", "core" = "x402_a2a/core", "executors" = "x402_a2a/executors", "type_defs" = "x402_a2a/type_defs", "extension.py" = "x402_a2a/extension.py" }
 
 [tool.hatch.metadata]
 allow-direct-references = true
@@ -56,3 +58,6 @@ markers = [
 
 [tool.ruff]
 target-version = "py311"
+
+[tool.mypy]
+files = ["core", "executors", "*.py"]
diff --git a/python/x402_a2a/tests/test_core.py b/python/x402_a2a/tests/test_core.py
index 16001db..3d31ad7 100644
--- a/python/x402_a2a/tests/test_core.py
+++ b/python/x402_a2a/tests/test_core.py
@@ -16,7 +16,7 @@
 
 from a2a.types import Task, Message, TaskState, TaskStatus, TextPart
 from x402_a2a.executors.server import x402ServerExecutor
-from x402_a2a.types import (
+from x402_a2a.type_defs import (
     PaymentStatus,
     x402Metadata,
     x402PaymentRequiredResponse,
diff --git a/python/x402_a2a/types/__init__.py b/python/x402_a2a/type_defs/__init__.py
similarity index 100%
rename from python/x402_a2a/types/__init__.py
rename to python/x402_a2a/type_defs/__init__.py
diff --git a/python/x402_a2a/types/config.py b/python/x402_a2a/type_defs/config.py
similarity index 100%
rename from python/x402_a2a/types/config.py
rename to python/x402_a2a/type_defs/config.py
diff --git a/python/x402_a2a/types/errors.py b/python/x402_a2a/type_defs/errors.py
similarity index 98%
rename from python/x402_a2a/types/errors.py
rename to python/x402_a2a/type_defs/errors.py
index d079762..4e9f45b 100644
--- a/python/x402_a2a/types/errors.py
+++ b/python/x402_a2a/type_defs/errors.py
@@ -54,7 +54,7 @@ class x402PaymentRequiredException(x402Error):
     requirements instead of relying on static server configuration.
 
     Example:
-        from x402_a2a.types.errors import x402PaymentRequiredException
+        from x402_a2a.type_defs.errors import x402PaymentRequiredException
         from x402_a2a.core.merchant import create_payment_requirements
 
         # Single payment option
diff --git a/python/x402_a2a/types/state.py b/python/x402_a2a/type_defs/state.py
similarity index 100%
rename from python/x402_a2a/types/state.py
rename to python/x402_a2a/type_defs/state.py
diff --git a/python/x402_a2a/uv.lock b/python/x402_a2a/uv.lock
index 6b419ce..6223c06 100644
--- a/python/x402_a2a/uv.lock
+++ b/python/x402_a2a/uv.lock
@@ -1097,6 +1097,53 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/fd/69/b547032297c7e63ba2af494edba695d781af8a0c6e89e4d06cf848b21d80/multidict-6.6.4-py3-none-any.whl", hash = "sha256:27d8f8e125c07cb954e54d75d04905a9bba8a439c1d84aca94949d4d03d8601c", size = 12313, upload-time = "2025-08-11T12:08:46.891Z" },
 ]
 
+[[package]]
+name = "mypy"
+version = "1.18.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "mypy-extensions" },
+    { name = "pathspec" },
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c0/77/8f0d0001ffad290cef2f7f216f96c814866248a0b92a722365ed54648e7e/mypy-1.18.2.tar.gz", hash = "sha256:06a398102a5f203d7477b2923dda3634c36727fa5c237d8f859ef90c42a9924b", size = 3448846, upload-time = "2025-09-19T00:11:10.519Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/88/87/cafd3ae563f88f94eec33f35ff722d043e09832ea8530ef149ec1efbaf08/mypy-1.18.2-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:807d9315ab9d464125aa9fcf6d84fde6e1dc67da0b6f80e7405506b8ac72bc7f", size = 12731198, upload-time = "2025-09-19T00:09:44.857Z" },
+    { url = "https://files.pythonhosted.org/packages/0f/e0/1e96c3d4266a06d4b0197ace5356d67d937d8358e2ee3ffac71faa843724/mypy-1.18.2-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:776bb00de1778caf4db739c6e83919c1d85a448f71979b6a0edd774ea8399341", size = 11817879, upload-time = "2025-09-19T00:09:47.131Z" },
+    { url = "https://files.pythonhosted.org/packages/72/ef/0c9ba89eb03453e76bdac5a78b08260a848c7bfc5d6603634774d9cd9525/mypy-1.18.2-cp311-cp311-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl", hash = "sha256:1379451880512ffce14505493bd9fe469e0697543717298242574882cf8cdb8d", size = 12427292, upload-time = "2025-09-19T00:10:22.472Z" },
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+    { url = "https://files.pythonhosted.org/packages/c8/7d/2697b930179e7277529eaaec1513f8de622818696857f689e4a5432e5e27/mypy-1.18.2-cp311-cp311-win_amd64.whl", hash = "sha256:664dc726e67fa54e14536f6e1224bcfce1d9e5ac02426d2326e2bb4e081d1ce8", size = 9757983, upload-time = "2025-09-19T00:10:09.071Z" },
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@@ -2196,6 +2252,7 @@ dev = [
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 ]
 lint = [
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     { name = "ruff" },
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