lithic-com · stainless-app · Jan 29, 2026 · Jan 29, 2026 · Jan 29, 2026 · Jan 30, 2026
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.114.0"
+  ".": "0.115.0"
 }
diff --git a/.stats.yml b/.stats.yml
@@ -1,4 +1,4 @@
-configured_endpoints: 175
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic%2Flithic-ce2adff9b644ed4562b5342a4a43d0b40c98d43b4e063b4626f4ca5d342f1b92.yml
-openapi_spec_hash: fbc84b866ce96457261ac58b4e75c71d
-config_hash: 31d71922d7838f34ae0875c9b8026d99
+configured_endpoints: 176
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic%2Flithic-a4803fcc96eac3196b6763e16264cc1b3292394102f3645a986a575c57d0a290.yml
+openapi_spec_hash: 8a62dfde46b1749196575f2879f54d77
+config_hash: 693dddc4721eef512d75ab6c60897794
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,34 @@
 # Changelog
 
+## 0.115.0 (2026-02-11)
+
+Full Changelog: [v0.114.0...v0.115.0](https://github.com/lithic-com/lithic-python/compare/v0.114.0...v0.115.0)
+
+### Features
+
+* **api:** Add /v2/auth_rules/results endpoint for listing rule evaluation data ([aea1658](https://github.com/lithic-com/lithic-python/commit/aea1658f300aeb41d859c9bb7271d883f3b4a2c3))
+* **api:** Add naics_code to account holder requests/responses ([a7135fb](https://github.com/lithic-com/lithic-python/commit/a7135fb5f63687973cc1856731eb6c7f524994e3))
+* **api:** Add result schemas for Authorization and Authentication (3DS) actions ([ced5f0d](https://github.com/lithic-com/lithic-python/commit/ced5f0db1ae27e02bde4402cfff8ef4a9e33ce1a))
+* **client:** add custom JSON encoder for extended type support ([5658dcc](https://github.com/lithic-com/lithic-python/commit/5658dccf4d989063d2d4ffdb243cfec17861a000))
+
+
+### Bug Fixes
+
+* **api:** Update /v2/auth_rules/results endpoint parameter naming and action types ([e50dd4d](https://github.com/lithic-com/lithic-python/commit/e50dd4d8a866a47d77c0e92c6e0703053c54f403))
+
+
+### Chores
+
+* configure new SDK language ([292317d](https://github.com/lithic-com/lithic-python/commit/292317d003f007992d8848fbe4a870164bac9d29))
+* Enable stainless MCP in config ([a799eec](https://github.com/lithic-com/lithic-python/commit/a799eeca71933e98243cf351caf374b9a59d9ce9))
+* **internal:** bump dependencies ([67243a9](https://github.com/lithic-com/lithic-python/commit/67243a9d839bb33d4b53a7a7b8cc02678d068f66))
+* **internal:** fix lint error on Python 3.14 ([73de2f2](https://github.com/lithic-com/lithic-python/commit/73de2f20082fecd5e07af008ff79b161c2b4378d))
+
+
+### Documentation
+
+* Fix documentation of tokenization channel and tokenization source for tokenization rules ([7d111f8](https://github.com/lithic-com/lithic-python/commit/7d111f8f8ee283412f9846f239ff626a410a2a24))
+
 ## 0.114.0 (2026-01-27)
 
 Full Changelog: [v0.113.0...v0.114.0](https://github.com/lithic-com/lithic-python/compare/v0.113.0...v0.114.0)

diff --git a/README.md b/README.md
@@ -7,6 +7,15 @@ The Lithic Python library provides convenient access to the Lithic REST API from
 application. The library includes type definitions for all request params and response fields,
 and offers both synchronous and asynchronous clients powered by [httpx](https://github.com/encode/httpx).
 
+## MCP Server
+
+Use the Lithic MCP Server to enable AI assistants to interact with this API, allowing them to explore endpoints, make test requests, and use documentation to help integrate this SDK into your application.
+
+[![Add to Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en-US/install-mcp?name=lithic-mcp&config=eyJuYW1lIjoibGl0aGljLW1jcCIsInRyYW5zcG9ydCI6Imh0dHAiLCJ1cmwiOiJodHRwczovL2xpdGhpYy5zdGxtY3AuY29tIiwiaGVhZGVycyI6eyJ4LWxpdGhpYy1hcGkta2V5IjoiTXkgTGl0aGljIEFQSSBLZXkifX0)
+[![Install in VS Code](https://img.shields.io/badge/_-Add_to_VS_Code-blue?style=for-the-badge&logo=data:image/svg%2bxml;base64,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)](https://vscode.stainless.com/mcp/%7B%22name%22%3A%22lithic-mcp%22%2C%22type%22%3A%22http%22%2C%22url%22%3A%22https%3A%2F%2Flithic.stlmcp.com%22%2C%22headers%22%3A%7B%22x-lithic-api-key%22%3A%22My%20Lithic%20API%20Key%22%7D%7D)
+
+> Note: You may need to set environment variables in your MCP client.
+
 ## Documentation
 
 The REST API documentation can be found on [docs.lithic.com](https://docs.lithic.com). The full API of this library can be found in [api.md](api.md).

diff --git a/api.md b/api.md
@@ -96,6 +96,7 @@ from lithic.types.auth_rules import (
     RuleStats,
     VelocityLimitParams,
     VelocityLimitPeriod,
+    V2ListResultsResponse,
     V2RetrieveFeaturesResponse,
     V2RetrieveReportResponse,
 )
@@ -109,6 +110,7 @@ Methods:
 - <code title="get /v2/auth_rules">client.auth_rules.v2.<a href="./src/lithic/resources/auth_rules/v2/v2.py">list</a>(\*\*<a href="src/lithic/types/auth_rules/v2_list_params.py">params</a>) -> <a href="./src/lithic/types/auth_rules/auth_rule.py">SyncCursorPage[AuthRule]</a></code>
 - <code title="delete /v2/auth_rules/{auth_rule_token}">client.auth_rules.v2.<a href="./src/lithic/resources/auth_rules/v2/v2.py">delete</a>(auth_rule_token) -> None</code>
 - <code title="post /v2/auth_rules/{auth_rule_token}/draft">client.auth_rules.v2.<a href="./src/lithic/resources/auth_rules/v2/v2.py">draft</a>(auth_rule_token, \*\*<a href="src/lithic/types/auth_rules/v2_draft_params.py">params</a>) -> <a href="./src/lithic/types/auth_rules/auth_rule.py">AuthRule</a></code>
+- <code title="get /v2/auth_rules/results">client.auth_rules.v2.<a href="./src/lithic/resources/auth_rules/v2/v2.py">list_results</a>(\*\*<a href="src/lithic/types/auth_rules/v2_list_results_params.py">params</a>) -> <a href="./src/lithic/types/auth_rules/v2_list_results_response.py">SyncCursorPage[V2ListResultsResponse]</a></code>
 - <code title="post /v2/auth_rules/{auth_rule_token}/promote">client.auth_rules.v2.<a href="./src/lithic/resources/auth_rules/v2/v2.py">promote</a>(auth_rule_token) -> <a href="./src/lithic/types/auth_rules/auth_rule.py">AuthRule</a></code>
 - <code title="get /v2/auth_rules/{auth_rule_token}/features">client.auth_rules.v2.<a href="./src/lithic/resources/auth_rules/v2/v2.py">retrieve_features</a>(auth_rule_token, \*\*<a href="src/lithic/types/auth_rules/v2_retrieve_features_params.py">params</a>) -> <a href="./src/lithic/types/auth_rules/v2_retrieve_features_response.py">V2RetrieveFeaturesResponse</a></code>
 - <code title="get /v2/auth_rules/{auth_rule_token}/report">client.auth_rules.v2.<a href="./src/lithic/resources/auth_rules/v2/v2.py">retrieve_report</a>(auth_rule_token, \*\*<a href="src/lithic/types/auth_rules/v2_retrieve_report_params.py">params</a>) -> <a href="./src/lithic/types/auth_rules/v2_retrieve_report_response.py">V2RetrieveReportResponse</a></code>

diff --git a/pyproject.toml b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "lithic"
-version = "0.114.0"
+version = "0.115.0"
 description = "The official Python library for the lithic API"
 dynamic = ["readme"]
 license = "Apache-2.0"

diff --git a/requirements-dev.lock b/requirements-dev.lock
@@ -12,14 +12,14 @@
 -e file:.
 aiohappyeyeballs==2.6.1
     # via aiohttp
-aiohttp==3.13.2
+aiohttp==3.13.3
     # via httpx-aiohttp
     # via lithic
 aiosignal==1.4.0
     # via aiohttp
 annotated-types==0.7.0
     # via pydantic
-anyio==4.12.0
+anyio==4.12.1
     # via httpx
     # via lithic
 argcomplete==3.6.3
@@ -32,7 +32,7 @@ attrs==25.4.0
     # via standardwebhooks
 backports-asyncio-runner==1.2.0
     # via pytest-asyncio
-certifi==2025.11.12
+certifi==2026.1.4
     # via httpcore
     # via httpx
 colorlog==6.10.1
@@ -65,15 +65,15 @@ httpx==0.28.1
     # via lithic
     # via respx
     # via standardwebhooks
-httpx-aiohttp==0.1.9
+httpx-aiohttp==0.1.12
     # via lithic
 humanize==4.13.0
     # via nox
 idna==3.11
     # via anyio
     # via httpx
     # via yarl
-importlib-metadata==8.7.0
+importlib-metadata==8.7.1
 iniconfig==2.1.0
     # via pytest
 markdown-it-py==3.0.0
@@ -86,14 +86,14 @@ multidict==6.7.0
 mypy==1.17.0
 mypy-extensions==1.1.0
     # via mypy
-nodeenv==1.9.1
+nodeenv==1.10.0
     # via pyright
 nox==2025.11.12
 packaging==25.0
     # via dependency-groups
     # via nox
     # via pytest
-pathspec==0.12.1
+pathspec==1.0.3
     # via mypy
 platformdirs==4.4.0
     # via virtualenv
@@ -120,15 +120,15 @@ python-dateutil==2.9.0.post0
     # via time-machine
 respx==0.22.0
 rich==14.2.0
-ruff==0.14.7
+ruff==0.14.13
 six==1.17.0
     # via python-dateutil
 sniffio==1.3.1
     # via lithic
 standardwebhooks==1.0.0
     # via lithic
 time-machine==2.19.0
-tomli==2.3.0
+tomli==2.4.0
     # via dependency-groups
     # via mypy
     # via nox
@@ -152,7 +152,7 @@ typing-extensions==4.15.0
     # via virtualenv
 typing-inspection==0.4.2
     # via pydantic
-virtualenv==20.35.4
+virtualenv==20.36.1
     # via nox
 wrapt==2.0.1
     # via deprecated

diff --git a/requirements.lock b/requirements.lock
@@ -12,22 +12,22 @@
 -e file:.
 aiohappyeyeballs==2.6.1
     # via aiohttp
-aiohttp==3.13.2
+aiohttp==3.13.3
     # via httpx-aiohttp
     # via lithic
 aiosignal==1.4.0
     # via aiohttp
 annotated-types==0.7.0
     # via pydantic
-anyio==4.12.0
+anyio==4.12.1
     # via httpx
     # via lithic
 async-timeout==5.0.1
     # via aiohttp
 attrs==25.4.0
     # via aiohttp
     # via standardwebhooks
-certifi==2025.11.12
+certifi==2026.1.4
     # via httpcore
     # via httpx
 deprecated==1.3.1
@@ -47,7 +47,7 @@ httpx==0.28.1
     # via httpx-aiohttp
     # via lithic
     # via standardwebhooks
-httpx-aiohttp==0.1.9
+httpx-aiohttp==0.1.12
     # via lithic
 idna==3.11
     # via anyio

diff --git a/src/lithic/_base_client.py b/src/lithic/_base_client.py
@@ -86,6 +86,7 @@
     APIConnectionError,
     APIResponseValidationError,
 )
+from ._utils._json import openapi_dumps
 from ._legacy_response import LegacyAPIResponse
 
 log: logging.Logger = logging.getLogger(__name__)
@@ -555,8 +556,10 @@ def _build_request(
                 kwargs["content"] = options.content
             elif isinstance(json_data, bytes):
                 kwargs["content"] = json_data
-            else:
-                kwargs["json"] = json_data if is_given(json_data) else None
+            elif not files:
+                # Don't set content when JSON is sent as multipart/form-data,
+                # since httpx's content param overrides other body arguments
+                kwargs["content"] = openapi_dumps(json_data) if is_given(json_data) and json_data is not None else None
             kwargs["files"] = files
         else:
             headers.pop("Content-Type", None)

diff --git a/src/lithic/_compat.py b/src/lithic/_compat.py
@@ -139,6 +139,7 @@ def model_dump(
     exclude_defaults: bool = False,
     warnings: bool = True,
     mode: Literal["json", "python"] = "python",
+    by_alias: bool | None = None,
 ) -> dict[str, Any]:
     if (not PYDANTIC_V1) or hasattr(model, "model_dump"):
         return model.model_dump(
@@ -148,13 +149,12 @@ def model_dump(
             exclude_defaults=exclude_defaults,
             # warnings are not supported in Pydantic v1
             warnings=True if PYDANTIC_V1 else warnings,
+            by_alias=by_alias,
         )
     return cast(
         "dict[str, Any]",
         model.dict(  # pyright: ignore[reportDeprecated, reportUnnecessaryCast]
-            exclude=exclude,
-            exclude_unset=exclude_unset,
-            exclude_defaults=exclude_defaults,
+            exclude=exclude, exclude_unset=exclude_unset, exclude_defaults=exclude_defaults, by_alias=bool(by_alias)
         ),
     )
 

diff --git a/src/lithic/_utils/_compat.py b/src/lithic/_utils/_compat.py
@@ -26,7 +26,7 @@ def is_union(tp: Optional[Type[Any]]) -> bool:
     else:
         import types
 
-        return tp is Union or tp is types.UnionType
+        return tp is Union or tp is types.UnionType  # type: ignore[comparison-overlap]
 
 
 def is_typeddict(tp: Type[Any]) -> bool:

diff --git a/src/lithic/_utils/_json.py b/src/lithic/_utils/_json.py
@@ -0,0 +1,35 @@
+import json
+from typing import Any
+from datetime import datetime
+from typing_extensions import override
+
+import pydantic
+
+from .._compat import model_dump
+
+
+def openapi_dumps(obj: Any) -> bytes:
+    """
+    Serialize an object to UTF-8 encoded JSON bytes.
+
+    Extends the standard json.dumps with support for additional types
+    commonly used in the SDK, such as `datetime`, `pydantic.BaseModel`, etc.
+    """
+    return json.dumps(
+        obj,
+        cls=_CustomEncoder,
+        # Uses the same defaults as httpx's JSON serialization
+        ensure_ascii=False,
+        separators=(",", ":"),
+        allow_nan=False,
+    ).encode()
+
+
+class _CustomEncoder(json.JSONEncoder):
+    @override
+    def default(self, o: Any) -> Any:
+        if isinstance(o, datetime):
+            return o.isoformat()
+        if isinstance(o, pydantic.BaseModel):
+            return model_dump(o, exclude_unset=True, mode="json", by_alias=True)
+        return super().default(o)
diff --git a/src/lithic/_version.py b/src/lithic/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "lithic"
-__version__ = "0.114.0"  # x-release-please-version
+__version__ = "0.115.0"  # x-release-please-version