diff --git a/openapi.json b/openapi.json
new file mode 100644
index 00000000..60283e30
--- /dev/null
+++ b/openapi.json
@@ -0,0 +1,150 @@
+{
+  "openapi": "3.0.0",
+  "info": {
+    "title": "RecoService",
+    "version": "1.0.0"
+  },
+  "components": {
+    "securitySchemes": {
+      "bearerAuth": {
+        "type": "http",
+        "scheme": "bearer",
+        "bearerFormat": "JWT"
+      }
+    },
+    "schemas": {
+      "RecoResponse": {
+        "type": "object",
+        "properties": {
+          "user_id": {
+            "type": "integer"
+          },
+          "items": {
+            "type": "array",
+            "items": {
+              "type": "integer"
+            }
+          }
+        }
+      },
+      "ErrorResponse": {
+        "type": "object",
+        "properties": {
+          "status_code": {
+            "type": "integer"
+          },
+          "error_key": {
+            "type": "string"
+          },
+          "error_message": {
+            "type": "string"
+          },
+          "error_loc": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          }
+        }
+      }
+    }
+  },
+  "security": [
+    {
+      "bearerAuth": []
+    }
+  ],
+  "paths": {
+    "/health": {
+      "get": {
+        "tags": [
+          "Health"
+        ],
+        "summary": "Health Check",
+        "security": [
+          {
+            "bearerAuth": []
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Server is operational"
+          },
+          "401": {
+            "description": "Unauthorized or invalid token",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/reco/{model_name}/{user_id}": {
+      "get": {
+        "tags": [
+          "Recommendations"
+        ],
+        "summary": "Get Recommendations",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "model_name",
+            "required": true,
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "in": "path",
+            "name": "user_id",
+            "required": true,
+            "schema": {
+              "type": "integer"
+            }
+          }
+        ],
+        "security": [
+          {
+            "bearerAuth": []
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Recommendations retrieved successfully",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/RecoResponse"
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Unauthorized or invalid token",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "User or model not found",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
index 3d6f99a6..6e3e23e1 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,10 +1,9 @@
-# This file is automatically @generated by Poetry 1.4.0 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.7.0 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
 version = "0.6.0"
 description = "Reusable constraint types to use with typing.Annotated"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -12,14 +11,10 @@ files = [
     {file = "annotated_types-0.6.0.tar.gz", hash = "sha256:563339e807e53ffd9c267e99fc6d9ea23eb8443c08f112651963e24e22f84a5d"},
 ]
 
-[package.dependencies]
-typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.9\""}
-
 [[package]]
 name = "anyio"
 version = "3.7.1"
 description = "High level compatibility layer for multiple asynchronous event loop implementations"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -41,7 +36,6 @@ trio = ["trio (<0.22)"]
 name = "astroid"
 version = "3.0.1"
 description = "An abstract syntax tree for Python with inference support."
-category = "dev"
 optional = false
 python-versions = ">=3.8.0"
 files = [
@@ -56,7 +50,6 @@ typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.11\""}
 name = "bandit"
 version = "1.7.5"
 description = "Security oriented static analyser for python code."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -80,7 +73,6 @@ yaml = ["PyYAML"]
 name = "black"
 version = "23.10.1"
 description = "The uncompromising code formatter."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -123,7 +115,6 @@ uvloop = ["uvloop (>=0.15.2)"]
 name = "certifi"
 version = "2023.7.22"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -135,7 +126,6 @@ files = [
 name = "charset-normalizer"
 version = "3.3.2"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
-category = "main"
 optional = false
 python-versions = ">=3.7.0"
 files = [
@@ -235,7 +225,6 @@ files = [
 name = "click"
 version = "8.1.7"
 description = "Composable command line interface toolkit"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -250,7 +239,6 @@ colorama = {version = "*", markers = "platform_system == \"Windows\""}
 name = "colorama"
 version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 files = [
@@ -262,7 +250,6 @@ files = [
 name = "dill"
 version = "0.3.7"
 description = "serialize all of Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -277,7 +264,6 @@ graph = ["objgraph (>=1.7.2)"]
 name = "exceptiongroup"
 version = "1.1.3"
 description = "Backport of PEP 654 (exception groups)"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -292,7 +278,6 @@ test = ["pytest (>=6)"]
 name = "fastapi"
 version = "0.104.1"
 description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -313,7 +298,6 @@ all = ["email-validator (>=2.0.0)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)"
 name = "flake8"
 version = "6.1.0"
 description = "the modular source code checker: pep8 pyflakes and co"
-category = "dev"
 optional = false
 python-versions = ">=3.8.1"
 files = [
@@ -330,7 +314,6 @@ pyflakes = ">=3.1.0,<3.2.0"
 name = "gitdb"
 version = "4.0.11"
 description = "Git Object Database"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -345,7 +328,6 @@ smmap = ">=3.0.1,<6"
 name = "gitpython"
 version = "3.1.40"
 description = "GitPython is a Python library used to interact with Git repositories"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -363,7 +345,6 @@ test = ["black", "coverage[toml]", "ddt (>=1.1.1,!=1.4.3)", "mock", "mypy", "pre
 name = "gunicorn"
 version = "21.2.0"
 description = "WSGI HTTP Server for UNIX"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -384,7 +365,6 @@ tornado = ["tornado (>=0.2)"]
 name = "h11"
 version = "0.12.0"
 description = "A pure-Python, bring-your-own-I/O implementation of HTTP/1.1"
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -396,7 +376,6 @@ files = [
 name = "httpcore"
 version = "0.14.7"
 description = "A minimal low-level HTTP client."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -405,20 +384,19 @@ files = [
 ]
 
 [package.dependencies]
-anyio = ">=3.0.0,<4.0.0"
+anyio = "==3.*"
 certifi = "*"
 h11 = ">=0.11,<0.13"
-sniffio = ">=1.0.0,<2.0.0"
+sniffio = "==1.*"
 
 [package.extras]
 http2 = ["h2 (>=3,<5)"]
-socks = ["socksio (>=1.0.0,<2.0.0)"]
+socks = ["socksio (==1.*)"]
 
 [[package]]
 name = "httpx"
 version = "0.22.0"
 description = "The next generation HTTP client."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -435,15 +413,14 @@ sniffio = "*"
 
 [package.extras]
 brotli = ["brotli", "brotlicffi"]
-cli = ["click (>=8.0.0,<9.0.0)", "pygments (>=2.0.0,<3.0.0)", "rich (>=10.0.0,<11.0.0)"]
+cli = ["click (==8.*)", "pygments (==2.*)", "rich (==10.*)"]
 http2 = ["h2 (>=3,<5)"]
-socks = ["socksio (>=1.0.0,<2.0.0)"]
+socks = ["socksio (==1.*)"]
 
 [[package]]
 name = "idna"
 version = "3.4"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -455,7 +432,6 @@ files = [
 name = "iniconfig"
 version = "2.0.0"
 description = "brain-dead simple config-ini parsing"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -467,7 +443,6 @@ files = [
 name = "isort"
 version = "5.12.0"
 description = "A Python utility / library to sort Python imports."
-category = "dev"
 optional = false
 python-versions = ">=3.8.0"
 files = [
@@ -481,11 +456,21 @@ pipfile-deprecated-finder = ["pip-shims (>=0.5.2)", "pipreqs", "requirementslib"
 plugins = ["setuptools"]
 requirements-deprecated-finder = ["pip-api", "pipreqs"]
 
+[[package]]
+name = "joblib"
+version = "1.3.2"
+description = "Lightweight pipelining with Python functions"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "joblib-1.3.2-py3-none-any.whl", hash = "sha256:ef4331c65f239985f3f2220ecc87db222f08fd22097a3dd5698f693875f8cbb9"},
+    {file = "joblib-1.3.2.tar.gz", hash = "sha256:92f865e621e17784e7955080b6d042489e3b8e294949cc44c6eac304f59772b1"},
+]
+
 [[package]]
 name = "markdown-it-py"
 version = "3.0.0"
 description = "Python port of markdown-it. Markdown parsing, done right!"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -510,7 +495,6 @@ testing = ["coverage", "pytest", "pytest-cov", "pytest-regressions"]
 name = "mccabe"
 version = "0.7.0"
 description = "McCabe checker, plugin for flake8"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -522,7 +506,6 @@ files = [
 name = "mdurl"
 version = "0.1.2"
 description = "Markdown URL utilities"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -534,7 +517,6 @@ files = [
 name = "mypy"
 version = "1.6.1"
 description = "Optional static typing for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -581,7 +563,6 @@ reports = ["lxml"]
 name = "mypy-extensions"
 version = "1.0.0"
 description = "Type system extensions for programs checked with the mypy type checker."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -589,11 +570,55 @@ files = [
     {file = "mypy_extensions-1.0.0.tar.gz", hash = "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"},
 ]
 
+[[package]]
+name = "numpy"
+version = "1.26.2"
+description = "Fundamental package for array computing in Python"
+optional = false
+python-versions = ">=3.9"
+files = [
+    {file = "numpy-1.26.2-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:3703fc9258a4a122d17043e57b35e5ef1c5a5837c3db8be396c82e04c1cf9b0f"},
+    {file = "numpy-1.26.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:cc392fdcbd21d4be6ae1bb4475a03ce3b025cd49a9be5345d76d7585aea69440"},
+    {file = "numpy-1.26.2-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:36340109af8da8805d8851ef1d74761b3b88e81a9bd80b290bbfed61bd2b4f75"},
+    {file = "numpy-1.26.2-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:bcc008217145b3d77abd3e4d5ef586e3bdfba8fe17940769f8aa09b99e856c00"},
+    {file = "numpy-1.26.2-cp310-cp310-musllinux_1_1_aarch64.whl", hash = "sha256:3ced40d4e9e18242f70dd02d739e44698df3dcb010d31f495ff00a31ef6014fe"},
+    {file = "numpy-1.26.2-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:b272d4cecc32c9e19911891446b72e986157e6a1809b7b56518b4f3755267523"},
+    {file = "numpy-1.26.2-cp310-cp310-win32.whl", hash = "sha256:22f8fc02fdbc829e7a8c578dd8d2e15a9074b630d4da29cda483337e300e3ee9"},
+    {file = "numpy-1.26.2-cp310-cp310-win_amd64.whl", hash = "sha256:26c9d33f8e8b846d5a65dd068c14e04018d05533b348d9eaeef6c1bd787f9919"},
+    {file = "numpy-1.26.2-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:b96e7b9c624ef3ae2ae0e04fa9b460f6b9f17ad8b4bec6d7756510f1f6c0c841"},
+    {file = "numpy-1.26.2-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:aa18428111fb9a591d7a9cc1b48150097ba6a7e8299fb56bdf574df650e7d1f1"},
+    {file = "numpy-1.26.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:06fa1ed84aa60ea6ef9f91ba57b5ed963c3729534e6e54055fc151fad0423f0a"},
+    {file = "numpy-1.26.2-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:96ca5482c3dbdd051bcd1fce8034603d6ebfc125a7bd59f55b40d8f5d246832b"},
+    {file = "numpy-1.26.2-cp311-cp311-musllinux_1_1_aarch64.whl", hash = "sha256:854ab91a2906ef29dc3925a064fcd365c7b4da743f84b123002f6139bcb3f8a7"},
+    {file = "numpy-1.26.2-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:f43740ab089277d403aa07567be138fc2a89d4d9892d113b76153e0e412409f8"},
+    {file = "numpy-1.26.2-cp311-cp311-win32.whl", hash = "sha256:a2bbc29fcb1771cd7b7425f98b05307776a6baf43035d3b80c4b0f29e9545186"},
+    {file = "numpy-1.26.2-cp311-cp311-win_amd64.whl", hash = "sha256:2b3fca8a5b00184828d12b073af4d0fc5fdd94b1632c2477526f6bd7842d700d"},
+    {file = "numpy-1.26.2-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:a4cd6ed4a339c21f1d1b0fdf13426cb3b284555c27ac2f156dfdaaa7e16bfab0"},
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+    {file = "numpy-1.26.2-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:f79b231bf5c16b1f39c7f4875e1ded36abee1591e98742b05d8a0fb55d8a3eec"},
+    {file = "numpy-1.26.2-cp312-cp312-win32.whl", hash = "sha256:4a06263321dfd3598cacb252f51e521a8cb4b6df471bb12a7ee5cbab20ea9167"},
+    {file = "numpy-1.26.2-cp312-cp312-win_amd64.whl", hash = "sha256:b04f5dc6b3efdaab541f7857351aac359e6ae3c126e2edb376929bd3b7f92d7e"},
+    {file = "numpy-1.26.2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:4eb8df4bf8d3d90d091e0146f6c28492b0be84da3e409ebef54349f71ed271ef"},
+    {file = "numpy-1.26.2-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:1a13860fdcd95de7cf58bd6f8bc5a5ef81c0b0625eb2c9a783948847abbef2c2"},
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+    {file = "numpy-1.26.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:baf8aab04a2c0e859da118f0b38617e5ee65d75b83795055fb66c0d5e9e9b818"},
+    {file = "numpy-1.26.2-cp39-cp39-musllinux_1_1_aarch64.whl", hash = "sha256:d73a3abcac238250091b11caef9ad12413dab01669511779bc9b29261dd50210"},
+    {file = "numpy-1.26.2-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:b361d369fc7e5e1714cf827b731ca32bff8d411212fccd29ad98ad622449cc36"},
+    {file = "numpy-1.26.2-cp39-cp39-win32.whl", hash = "sha256:bd3f0091e845164a20bd5a326860c840fe2af79fa12e0469a12768a3ec578d80"},
+    {file = "numpy-1.26.2-cp39-cp39-win_amd64.whl", hash = "sha256:2beef57fb031dcc0dc8fa4fe297a742027b954949cabb52a2a376c144e5e6060"},
+    {file = "numpy-1.26.2-pp39-pypy39_pp73-macosx_10_9_x86_64.whl", hash = "sha256:1cc3d5029a30fb5f06704ad6b23b35e11309491c999838c31f124fee32107c79"},
+    {file = "numpy-1.26.2-pp39-pypy39_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:94cc3c222bb9fb5a12e334d0479b97bb2df446fbe622b470928f5284ffca3f8d"},
+    {file = "numpy-1.26.2-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:fe6b44fb8fcdf7eda4ef4461b97b3f63c466b27ab151bec2366db8b197387841"},
+    {file = "numpy-1.26.2.tar.gz", hash = "sha256:f65738447676ab5777f11e6bbbdb8ce11b785e105f690bc45966574816b6d3ea"},
+]
+
 [[package]]
 name = "orjson"
 version = "3.9.10"
 description = "Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -653,7 +678,6 @@ files = [
 name = "packaging"
 version = "23.2"
 description = "Core utilities for Python packages"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -661,11 +685,78 @@ files = [
     {file = "packaging-23.2.tar.gz", hash = "sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5"},
 ]
 
+[[package]]
+name = "pandas"
+version = "2.1.3"
+description = "Powerful data structures for data analysis, time series, and statistics"
+optional = false
+python-versions = ">=3.9"
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 version = "0.11.2"
 description = "Utility library for gitignore style pattern matching of file paths."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -677,7 +768,6 @@ files = [
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 version = "5.11.1"
 description = "Python Build Reasonableness"
-category = "dev"
 optional = false
 python-versions = ">=2.6"
 files = [
@@ -689,7 +779,6 @@ files = [
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 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
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@@ -705,7 +794,6 @@ test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.4)", "pytest-co
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 version = "1.3.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
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@@ -721,7 +809,6 @@ testing = ["pytest", "pytest-benchmark"]
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 description = "Python style guide checker"
-category = "dev"
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 python-versions = ">=3.8"
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@@ -733,7 +820,6 @@ files = [
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 version = "2.4.2"
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 python-versions = ">=3.7"
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@@ -753,7 +839,6 @@ email = ["email-validator (>=2.0.0)"]
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-category = "main"
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 python-versions = ">=3.7"
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@@ -872,7 +957,6 @@ typing-extensions = ">=4.6.0,<4.7.0 || >4.7.0"
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 python-versions = ">=3.7"
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@@ -888,7 +972,6 @@ python-dotenv = ">=0.21.0"
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 version = "3.1.0"
 description = "passive checker of Python programs"
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 python-versions = ">=3.8"
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@@ -900,7 +983,6 @@ files = [
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 description = "Pygments is a syntax highlighting package written in Python."
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 optional = false
 python-versions = ">=3.7"
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@@ -915,7 +997,6 @@ plugins = ["importlib-metadata"]
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 description = "python code static checker"
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 optional = false
 python-versions = ">=3.8.0"
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@@ -928,8 +1009,8 @@ astroid = ">=3.0.1,<=3.1.0-dev0"
 colorama = {version = ">=0.4.5", markers = "sys_platform == \"win32\""}
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     {version = ">=0.3.7", markers = "python_version >= \"3.12\""},
+    {version = ">=0.3.6", markers = "python_version >= \"3.11\" and python_version < \"3.12\""},
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 isort = ">=4.2.5,<6"
 mccabe = ">=0.6,<0.8"
@@ -946,7 +1027,6 @@ testutils = ["gitpython (>3)"]
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 version = "7.4.3"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -965,11 +1045,24 @@ tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
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 testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
 
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+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
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-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -980,11 +1073,21 @@ files = [
 [package.extras]
 cli = ["click (>=5.0)"]
 
+[[package]]
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+description = "World timezone definitions, modern and historical"
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+python-versions = "*"
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 [[package]]
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-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
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 optional = false
 python-versions = ">=3.7"
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@@ -1066,7 +1168,6 @@ use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
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 version = "1.5.0"
 description = "Validating URI References per RFC 3986"
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@@ -1084,7 +1185,6 @@ idna2008 = ["idna"]
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 description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
-category = "dev"
 optional = false
 python-versions = ">=3.7.0"
 files = [
@@ -1095,16 +1195,114 @@ files = [
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 pygments = ">=2.13.0,<3.0.0"
-typing-extensions = {version = ">=4.0.0,<5.0", markers = "python_version < \"3.9\""}
 
 [package.extras]
 jupyter = ["ipywidgets (>=7.5.1,<9)"]
 
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+joblib = ">=1.1.1"
+numpy = ">=1.17.3,<2.0"
+scipy = ">=1.5.0"
+threadpoolctl = ">=2.0.0"
+
+[package.extras]
+benchmark = ["matplotlib (>=3.1.3)", "memory-profiler (>=0.57.0)", "pandas (>=1.0.5)"]
+docs = ["Pillow (>=7.1.2)", "matplotlib (>=3.1.3)", "memory-profiler (>=0.57.0)", "numpydoc (>=1.2.0)", "pandas (>=1.0.5)", "plotly (>=5.14.0)", "pooch (>=1.6.0)", "scikit-image (>=0.16.2)", "seaborn (>=0.9.0)", "sphinx (>=6.0.0)", "sphinx-copybutton (>=0.5.2)", "sphinx-gallery (>=0.10.1)", "sphinx-prompt (>=1.3.0)", "sphinxext-opengraph (>=0.4.2)"]
+examples = ["matplotlib (>=3.1.3)", "pandas (>=1.0.5)", "plotly (>=5.14.0)", "pooch (>=1.6.0)", "scikit-image (>=0.16.2)", "seaborn (>=0.9.0)"]
+tests = ["black (>=23.3.0)", "matplotlib (>=3.1.3)", "mypy (>=1.3)", "numpydoc (>=1.2.0)", "pandas (>=1.0.5)", "pooch (>=1.6.0)", "pyamg (>=4.0.0)", "pytest (>=7.1.2)", "pytest-cov (>=2.9.0)", "ruff (>=0.0.272)", "scikit-image (>=0.16.2)"]
+
+[[package]]
+name = "scipy"
+version = "1.11.3"
+description = "Fundamental algorithms for scientific computing in Python"
+optional = false
+python-versions = "<3.13,>=3.9"
+files = [
+    {file = "scipy-1.11.3-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:370f569c57e1d888304052c18e58f4a927338eafdaef78613c685ca2ea0d1fa0"},
+    {file = "scipy-1.11.3-cp310-cp310-macosx_12_0_arm64.whl", hash = "sha256:9885e3e4f13b2bd44aaf2a1a6390a11add9f48d5295f7a592393ceb8991577a3"},
+    {file = "scipy-1.11.3-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:e04aa19acc324a1a076abb4035dabe9b64badb19f76ad9c798bde39d41025cdc"},
+    {file = "scipy-1.11.3-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:3e1a8a4657673bfae1e05e1e1d6e94b0cabe5ed0c7c144c8aa7b7dbb774ce5c1"},
+    {file = "scipy-1.11.3-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:7abda0e62ef00cde826d441485e2e32fe737bdddee3324e35c0e01dee65e2a88"},
+    {file = "scipy-1.11.3-cp310-cp310-win_amd64.whl", hash = "sha256:033c3fd95d55012dd1148b201b72ae854d5086d25e7c316ec9850de4fe776929"},
+    {file = "scipy-1.11.3-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:925c6f09d0053b1c0f90b2d92d03b261e889b20d1c9b08a3a51f61afc5f58165"},
+    {file = "scipy-1.11.3-cp311-cp311-macosx_12_0_arm64.whl", hash = "sha256:5664e364f90be8219283eeb844323ff8cd79d7acbd64e15eb9c46b9bc7f6a42a"},
+    {file = "scipy-1.11.3-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:00f325434b6424952fbb636506f0567898dca7b0f7654d48f1c382ea338ce9a3"},
+    {file = "scipy-1.11.3-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5f290cf561a4b4edfe8d1001ee4be6da60c1c4ea712985b58bf6bc62badee221"},
+    {file = "scipy-1.11.3-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:91770cb3b1e81ae19463b3c235bf1e0e330767dca9eb4cd73ba3ded6c4151e4d"},
+    {file = "scipy-1.11.3-cp311-cp311-win_amd64.whl", hash = "sha256:e1f97cd89c0fe1a0685f8f89d85fa305deb3067d0668151571ba50913e445820"},
+    {file = "scipy-1.11.3-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:dfcc1552add7cb7c13fb70efcb2389d0624d571aaf2c80b04117e2755a0c5d15"},
+    {file = "scipy-1.11.3-cp312-cp312-macosx_12_0_arm64.whl", hash = "sha256:0d3a136ae1ff0883fffbb1b05b0b2fea251cb1046a5077d0b435a1839b3e52b7"},
+    {file = "scipy-1.11.3-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:bae66a2d7d5768eaa33008fa5a974389f167183c87bf39160d3fefe6664f8ddc"},
+    {file = "scipy-1.11.3-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d2f6dee6cbb0e263b8142ed587bc93e3ed5e777f1f75448d24fb923d9fd4dce6"},
+    {file = "scipy-1.11.3-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:74e89dc5e00201e71dd94f5f382ab1c6a9f3ff806c7d24e4e90928bb1aafb280"},
+    {file = "scipy-1.11.3-cp312-cp312-win_amd64.whl", hash = "sha256:90271dbde4be191522b3903fc97334e3956d7cfb9cce3f0718d0ab4fd7d8bfd6"},
+    {file = "scipy-1.11.3-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:a63d1ec9cadecce838467ce0631c17c15c7197ae61e49429434ba01d618caa83"},
+    {file = "scipy-1.11.3-cp39-cp39-macosx_12_0_arm64.whl", hash = "sha256:5305792c7110e32ff155aed0df46aa60a60fc6e52cd4ee02cdeb67eaccd5356e"},
+    {file = "scipy-1.11.3-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:9ea7f579182d83d00fed0e5c11a4aa5ffe01460444219dedc448a36adf0c3917"},
+    {file = "scipy-1.11.3-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c77da50c9a91e23beb63c2a711ef9e9ca9a2060442757dffee34ea41847d8156"},
+    {file = "scipy-1.11.3-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:15f237e890c24aef6891c7d008f9ff7e758c6ef39a2b5df264650eb7900403c0"},
+    {file = "scipy-1.11.3-cp39-cp39-win_amd64.whl", hash = "sha256:4b4bb134c7aa457e26cc6ea482b016fef45db71417d55cc6d8f43d799cdf9ef2"},
+    {file = "scipy-1.11.3.tar.gz", hash = "sha256:bba4d955f54edd61899776bad459bf7326e14b9fa1c552181f0479cc60a568cd"},
+]
+
+[package.dependencies]
+numpy = ">=1.21.6,<1.28.0"
+
+[package.extras]
+dev = ["click", "cython-lint (>=0.12.2)", "doit (>=0.36.0)", "mypy", "pycodestyle", "pydevtool", "rich-click", "ruff", "types-psutil", "typing_extensions"]
+doc = ["jupytext", "matplotlib (>2)", "myst-nb", "numpydoc", "pooch", "pydata-sphinx-theme (==0.9.0)", "sphinx (!=4.1.0)", "sphinx-design (>=0.2.0)"]
+test = ["asv", "gmpy2", "mpmath", "pooch", "pytest", "pytest-cov", "pytest-timeout", "pytest-xdist", "scikit-umfpack", "threadpoolctl"]
+
+[[package]]
+name = "six"
+version = "1.16.0"
+description = "Python 2 and 3 compatibility utilities"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
+    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
+
 [[package]]
 name = "smmap"
 version = "5.0.1"
 description = "A pure Python implementation of a sliding window memory map manager"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1116,7 +1314,6 @@ files = [
 name = "sniffio"
 version = "1.3.0"
 description = "Sniff out which async library your code is running under"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1128,7 +1325,6 @@ files = [
 name = "starlette"
 version = "0.27.0"
 description = "The little ASGI library that shines."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1147,7 +1343,6 @@ full = ["httpx (>=0.22.0)", "itsdangerous", "jinja2", "python-multipart", "pyyam
 name = "stevedore"
 version = "5.1.0"
 description = "Manage dynamic plugins for Python applications"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1158,11 +1353,21 @@ files = [
 [package.dependencies]
 pbr = ">=2.0.0,<2.1.0 || >2.1.0"
 
+[[package]]
+name = "threadpoolctl"
+version = "3.2.0"
+description = "threadpoolctl"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "threadpoolctl-3.2.0-py3-none-any.whl", hash = "sha256:2b7818516e423bdaebb97c723f86a7c6b0a83d3f3b0970328d66f4d9104dc032"},
+    {file = "threadpoolctl-3.2.0.tar.gz", hash = "sha256:c96a0ba3bdddeaca37dc4cc7344aafad41cdb8c313f74fdfe387a867bba93355"},
+]
+
 [[package]]
 name = "tomli"
 version = "2.0.1"
 description = "A lil' TOML parser"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1174,7 +1379,6 @@ files = [
 name = "tomlkit"
 version = "0.12.2"
 description = "Style preserving TOML library"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1186,7 +1390,6 @@ files = [
 name = "typing-extensions"
 version = "4.8.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1194,11 +1397,21 @@ files = [
     {file = "typing_extensions-4.8.0.tar.gz", hash = "sha256:df8e4339e9cb77357558cbdbceca33c303714cf861d1eef15e1070055ae8b7ef"},
 ]
 
+[[package]]
+name = "tzdata"
+version = "2023.3"
+description = "Provider of IANA time zone data"
+optional = false
+python-versions = ">=2"
+files = [
+    {file = "tzdata-2023.3-py2.py3-none-any.whl", hash = "sha256:7e65763eef3120314099b6939b5546db7adce1e7d6f2e179e3df563c70511eda"},
+    {file = "tzdata-2023.3.tar.gz", hash = "sha256:11ef1e08e54acb0d4f95bdb1be05da659673de4acbd21bf9c69e94cc5e907a3a"},
+]
+
 [[package]]
 name = "urllib3"
 version = "2.0.7"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1216,7 +1429,6 @@ zstd = ["zstandard (>=0.18.0)"]
 name = "uvicorn"
 version = "0.23.2"
 description = "The lightning-fast ASGI server."
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1236,7 +1448,6 @@ standard = ["colorama (>=0.4)", "httptools (>=0.5.0)", "python-dotenv (>=0.13)",
 name = "uvloop"
 version = "0.19.0"
 description = "Fast implementation of asyncio event loop on top of libuv"
-category = "main"
 optional = false
 python-versions = ">=3.8.0"
 files = [
@@ -1279,5 +1490,5 @@ test = ["Cython (>=0.29.36,<0.30.0)", "aiohttp (==3.9.0b0)", "aiohttp (>=3.8.1)"
 
 [metadata]
 lock-version = "2.0"
-python-versions = "^3.8.1"
-content-hash = "add0a32ac2cde7c15ee5132b2b1ea1216dab96d9a3d01238822ff4b94e7800a5"
+python-versions = ">=3.9,<3.13"
+content-hash = "76495e27cc6d5c3810bb4e474fb80ae32fc071779be5fde13a7af4206fbb595e"
diff --git a/pyproject.toml b/pyproject.toml
index 87204682..d57f5e61 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.8.1"
+python = ">=3.9,<3.13"
 fastapi = "^0.104.0"
 pydantic = "^2.4.2"
 gunicorn = "^21.2.0"
@@ -20,6 +20,10 @@ orjson = "^3.9.10"
 starlette = "^0.27.0"
 httpx = "^0.22.0"  # for starlette.testclient
 pydantic-settings = "^2.0.3"
+pandas = "^2.1.3"
+numpy = "^1.26.2"
+scipy = "^1.11.3"
+scikit-learn = "^1.3.2"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "7.4.3"
diff --git a/service/api/auth.py b/service/api/auth.py
new file mode 100644
index 00000000..9438b21b
--- /dev/null
+++ b/service/api/auth.py
@@ -0,0 +1,17 @@
+import os
+
+from dotenv import load_dotenv
+
+from .exceptions import InvalidAuthorization
+
+load_dotenv()
+
+
+def check_access(authorization: str):
+    if authorization is None:
+        raise InvalidAuthorization(error_message="No token")
+    token = authorization.split(" ")[-1]
+    secret_key = os.getenv("SECRET_KEY")
+    print(secret_key)
+    if token != secret_key:
+        raise InvalidAuthorization(error_message="Invalid token")
diff --git a/service/api/exceptions.py b/service/api/exceptions.py
index 3fc78268..7ace71eb 100644
--- a/service/api/exceptions.py
+++ b/service/api/exceptions.py
@@ -26,3 +26,25 @@ def __init__(
         error_loc: tp.Optional[tp.Sequence[str]] = None,
     ):
         super().__init__(status_code, error_key, error_message, error_loc)
+
+
+class ModelNotFoundError(AppException):
+    def __init__(
+        self,
+        status_code: int = HTTPStatus.NOT_FOUND,
+        error_key: str = "model_not_found",
+        error_message: str = "Model is unknown",
+        error_loc: tp.Optional[tp.Sequence[str]] = None,
+    ):
+        super().__init__(status_code, error_key, error_message, error_loc)
+
+
+class InvalidAuthorization(AppException):
+    def __init__(
+        self,
+        status_code: int = HTTPStatus.UNAUTHORIZED,
+        error_key: str = "invalid_token",
+        error_message: str = "Invalid token",
+        error_loc: tp.Optional[tp.Sequence[str]] = None,
+    ):
+        super().__init__(status_code, error_key, error_message, error_loc)
diff --git a/service/api/recsys/user_based_recsys.py b/service/api/recsys/user_based_recsys.py
new file mode 100644
index 00000000..146595d5
--- /dev/null
+++ b/service/api/recsys/user_based_recsys.py
@@ -0,0 +1,77 @@
+from collections import Counter
+from typing import List
+
+import pandas as pd
+from sklearn.metrics.pairwise import cosine_similarity
+
+users = pd.read_csv("service/api/recsys/kion_train/users.csv")
+interactions = pd.read_csv("service/api/recsys/kion_train/interactions.csv")
+
+
+def user_based_recsys(user_id: int, n_recommendations: int = 10) -> List[int]:
+    if user_id not in users["user_id"].values:
+        return []
+    user_info = users[users["user_id"] == user_id]
+    user_sex = user_info["sex"].iloc[0]
+    user_age = user_info["age"].iloc[0]
+
+    user_items = set(interactions[interactions["user_id"] == user_id]["item_id"])
+
+    filtered_users = set(users[(users["sex"] == user_sex) & (users["age"] == user_age)]["user_id"])
+    active_interactions = interactions[
+        (
+            (interactions["watched_pct"] > 90)
+            & (interactions["item_id"].isin(user_items))
+            & (interactions["user_id"].isin(filtered_users))
+        )
+        | (interactions["user_id"] == user_id)
+    ]
+
+    if active_interactions.shape[0] == 0:
+        return []
+
+    if active_interactions.shape[0] > 1000:
+        active_interactions = active_interactions.sample(n=1000)
+
+    user_item_matrix = active_interactions.pivot_table(
+        index="user_id", columns="item_id", values="watched_pct", fill_value=0
+    )
+
+    similarity_matrix = cosine_similarity(user_item_matrix)
+    similarity_df = pd.DataFrame(similarity_matrix, index=user_item_matrix.index, columns=user_item_matrix.index)
+
+    similar_users = similarity_df[user_id].nlargest(n_recommendations + 1).index[1:]
+
+    item_counts: Counter = Counter()
+    for similar_user in similar_users:
+        similar_user_items = set(interactions[interactions["user_id"] == similar_user]["item_id"])
+        new_recommendations = similar_user_items.difference(user_items)
+        item_counts.update(new_recommendations)
+
+    top_recommendations = [item for item, _ in item_counts.most_common(n_recommendations)]
+
+    return top_recommendations
+
+
+def find_top_movies(n: int = 10) -> List[int]:
+    high_watch_pct_interactions = interactions[interactions["watched_pct"] > 95]
+    total_watch_time_per_movie = high_watch_pct_interactions.groupby("item_id")["total_dur"].sum()
+    top_movies = total_watch_time_per_movie.nlargest(n).index.tolist()
+    return top_movies
+
+
+def complete_array_to_ten(recommendations: List[int], top_movies: List[int]) -> List[int]:
+    elements_to_add = 10 - len(recommendations)
+    if elements_to_add > 0:
+        recommendations.extend(top_movies[:elements_to_add])
+
+    return recommendations
+
+
+def get_reccomendation(user_id: int, n_recommendations: int = 10) -> List[int]:
+    rec = user_based_recsys(user_id)
+    if len(rec) == 10:
+        return rec
+    popular = find_top_movies(n=n_recommendations)
+    rec = complete_array_to_ten(rec, popular)
+    return rec
diff --git a/service/api/views.py b/service/api/views.py
index 24cf4a7f..ade2b6c4 100644
--- a/service/api/views.py
+++ b/service/api/views.py
@@ -1,9 +1,10 @@
 from typing import List
 
-from fastapi import APIRouter, FastAPI, Request
+from fastapi import APIRouter, FastAPI, Header, Request
 from pydantic import BaseModel
 
-from service.api.exceptions import UserNotFoundError
+from service.api.auth import check_access
+from service.api.exceptions import ModelNotFoundError, UserNotFoundError
 from service.log import app_logger
 
 
@@ -28,20 +29,17 @@ async def health() -> str:
     tags=["Recommendations"],
     response_model=RecoResponse,
 )
-async def get_reco(
-    request: Request,
-    model_name: str,
-    user_id: int,
-) -> RecoResponse:
+async def get_reco(model_name: str, user_id: int, request: Request, authorization: str = Header(None)) -> RecoResponse:
+    check_access(authorization)
     app_logger.info(f"Request for model: {model_name}, user_id: {user_id}")
 
-    # Write your code here
-
+    if model_name != "user_based":
+        raise ModelNotFoundError(error_message=f"Model {model_name} not found")
     if user_id > 10**9:
         raise UserNotFoundError(error_message=f"User {user_id} not found")
 
     k_recs = request.app.state.k_recs
-    reco = list(range(k_recs))
+    reco = list(range(1, k_recs))
     return RecoResponse(user_id=user_id, items=reco)
 
 
diff --git a/tests/api/test_views.py b/tests/api/test_views.py
index 50516b47..e120f648 100644
--- a/tests/api/test_views.py
+++ b/tests/api/test_views.py
@@ -11,7 +11,7 @@ def test_health(
     client: TestClient,
 ) -> None:
     with client:
-        response = client.get("/health")
+        response = client.get("/health", headers={"Authorization": "Bearer mYOHbHbOwViaarXnJGlAihcJhIjjQDUQ"})
     assert response.status_code == HTTPStatus.OK
 
 
@@ -19,10 +19,10 @@ def test_get_reco_success(
     client: TestClient,
     service_config: ServiceConfig,
 ) -> None:
-    user_id = 123
-    path = GET_RECO_PATH.format(model_name="some_model", user_id=user_id)
+    user_id = 864613
+    path = GET_RECO_PATH.format(model_name="user_based", user_id=user_id)
     with client:
-        response = client.get(path)
+        response = client.get(path, headers={"Authorization": "Bearer mYOHbHbOwViaarXnJGlAihcJhIjjQDUQ"})
     assert response.status_code == HTTPStatus.OK
     response_json = response.json()
     assert response_json["user_id"] == user_id
@@ -34,8 +34,36 @@ def test_get_reco_for_unknown_user(
     client: TestClient,
 ) -> None:
     user_id = 10**10
-    path = GET_RECO_PATH.format(model_name="some_model", user_id=user_id)
+    path = GET_RECO_PATH.format(model_name="user_based", user_id=user_id)
     with client:
-        response = client.get(path)
+        response = client.get(path, headers={"Authorization": "Bearer mYOHbHbOwViaarXnJGlAihcJhIjjQDUQ"})
     assert response.status_code == HTTPStatus.NOT_FOUND
     assert response.json()["errors"][0]["error_key"] == "user_not_found"
+
+
+def test_get_reco_with_unknown_model(
+    client: TestClient,
+) -> None:
+    model_name = "model_name"
+    path = GET_RECO_PATH.format(model_name=model_name, user_id=864613)
+    with client:
+        response = client.get(path, headers={"Authorization": "Bearer mYOHbHbOwViaarXnJGlAihcJhIjjQDUQ"})
+    assert response.status_code == HTTPStatus.NOT_FOUND
+    assert response.json()["errors"][0]["error_key"] == "model_not_found"
+
+
+def test_check_authorizatin_success(
+    client: TestClient,
+) -> None:
+    with client:
+        response = client.get("/health", headers={"Authorization": "Bearer mYOHbHbOwViaarXnJGlAihcJhIjjQDUQ"})
+    assert response.status_code == HTTPStatus.OK
+    assert response.json() == "I am alive"
+
+
+def test_check_authorizatin_unsuccess(
+    client: TestClient,
+) -> None:
+    with client:
+        response = client.get("/health", headers={"Authorization": "Bearer mYOHbOwarXnJGlAihcJhIjjQDUQ"})
+    assert response.status_code == HTTPStatus.UNAUTHORIZED