diff --git a/calendar_booking_api.py b/calendar_booking_api.py
new file mode 100644
index 0000000..1c00f79
--- /dev/null
+++ b/calendar_booking_api.py
@@ -0,0 +1,116 @@
+import bisect
+from datetime import datetime, timedelta
+from flask import Flask, jsonify, redirect, request
+from google.auth.transport.requests import Request
+from google.oauth2.credentials import Credentials
+from googleapiclient.discovery import build
+import pytz
+
+
+# Monday to Friday
+WEEK_DAYS = {1, 2, 3, 4, 5}
+
+# 9 to 5
+FROM = 9
+TO = 17
+
+TIMEZONE = pytz.timezone('America/New_York')
+
+AVAILABILITY_LIFETIME = timedelta(minutes=2)
+
+SCOPES = ['https://www.googleapis.com/auth/calendar']
+
+UTC = pytz.timezone('UTC')
+
+creds = Credentials.from_authorized_user_file('creds.json', SCOPES)
+
+
+def read_datetime(dct):
+    dt = datetime.fromisoformat(dct['dateTime']).replace(tzinfo=None)
+    dt = pytz.timezone(dct['timeZone']).localize(dt)
+    return dt
+
+
+def asutciso(dt):
+    return dt.astimezone(UTC).isoformat()[:19] + 'Z'
+
+
+def aslocal(dt):
+    return dt.astimezone(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S')
+
+
+def get_availability():
+    if not creds.valid:
+        creds.refresh(Request())
+    service = build('calendar', 'v3', credentials=creds)
+
+    # Get events for the next 2 weeks
+    now = datetime.utcnow()
+    start = datetime(now.year, now.month, now.day)
+    end = start + timedelta(days=14)
+    events_result = service.events().list(
+        calendarId='primary',
+        timeMin=asutciso(now),
+        timeMax=asutciso(end),
+        maxResults=200,
+        singleEvents=True,
+        orderBy='startTime',
+    ).execute()
+
+    # Build a list of possible time slots for the next 2 weeks
+    availability = []
+    for day in range(14):
+        day = start + timedelta(days=day)
+        if day.weekday() not in WEEK_DAYS:
+            continue
+        for hour in range(FROM, TO):
+            for minute in (0, 30):
+                availability.append(TIMEZONE.localize(
+                    day.replace(hour=hour, minute=minute),
+                ))
+
+    for event in events_result.get('items', []):
+        event_start = read_datetime(event['start'])
+        event_end = read_datetime(event['end'])
+
+        # Find the first slot that starts less than 30min before this event
+        first_idx = bisect.bisect_right(
+            availability,
+            event_start - timedelta(minutes=30),
+        )
+
+        # Find the first slot that starts after this event ends
+        last_idx = bisect.bisect_left(
+            availability,
+            event_end,
+        )
+
+        # Remove the slots from the availability
+        del availability[first_idx:last_idx]
+
+    return availability
+
+
+availability = get_availability()
+availability_as_of_date = datetime.utcnow()
+
+
+app = Flask('calendar_booking_api')
+
+
+@app.route('/availability')
+def api_availability():
+    global availability, availability_as_of_date
+    if (
+        availability_as_of_date is None
+        or availability_as_of_date + AVAILABILITY_LIFETIME < datetime.utcnow()
+    ):
+        availability = get_availability()
+        availability_as_of_date = datetime.utcnow()
+
+    return jsonify({'availability': [asutciso(time) for time in availability]})
+
+
+@app.route('/book', methods=['POST'])
+def api_book():
+    TODO
diff --git a/poetry.lock b/poetry.lock
index 08e4784..4630906 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -66,11 +66,22 @@ python-versions = ">=3.5.0"
 [package.extras]
 unicode_backport = ["unicodedata2"]
 
+[[package]]
+name = "click"
+version = "8.1.3"
+description = "Composable command line interface toolkit"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
 [[package]]
 name = "colorama"
 version = "0.4.4"
 description = "Cross-platform colored terminal text."
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -106,6 +117,25 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "flask"
+version = "2.1.2"
+description = "A simple framework for building complex web applications."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+click = ">=8.0"
+importlib-metadata = {version = ">=3.6.0", markers = "python_version < \"3.10\""}
+itsdangerous = ">=2.0"
+Jinja2 = ">=3.0"
+Werkzeug = ">=2.0"
+
+[package.extras]
+async = ["asgiref (>=3.2)"]
+dotenv = ["python-dotenv"]
+
 [[package]]
 name = "google-api-core"
 version = "2.7.3"
@@ -220,6 +250,22 @@ category = "main"
 optional = false
 python-versions = ">=3.5"
 
+[[package]]
+name = "importlib-metadata"
+version = "4.11.3"
+description = "Read metadata from Python packages"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
+perf = ["ipython"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "importlib-resources (>=1.3)"]
+
 [[package]]
 name = "ipykernel"
 version = "6.13.0"
@@ -278,6 +324,14 @@ qtconsole = ["qtconsole"]
 test = ["pytest (<7.1)", "pytest-asyncio", "testpath"]
 test_extra = ["pytest (<7.1)", "pytest-asyncio", "testpath", "curio", "matplotlib (!=3.2.0)", "nbformat", "numpy (>=1.19)", "pandas", "trio"]
 
+[[package]]
+name = "itsdangerous"
+version = "2.1.2"
+description = "Safely pass data to untrusted environments and back."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
 [[package]]
 name = "jedi"
 version = "0.18.1"
@@ -293,6 +347,20 @@ parso = ">=0.8.0,<0.9.0"
 qa = ["flake8 (==3.8.3)", "mypy (==0.782)"]
 testing = ["Django (<3.1)", "colorama", "docopt", "pytest (<7.0.0)"]
 
+[[package]]
+name = "jinja2"
+version = "3.1.2"
+description = "A very fast and expressive template engine."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+MarkupSafe = ">=2.0"
+
+[package.extras]
+i18n = ["Babel (>=2.7)"]
+
 [[package]]
 name = "jupyter-client"
 version = "7.3.1"
@@ -329,6 +397,14 @@ traitlets = "*"
 [package.extras]
 test = ["ipykernel", "pre-commit", "pytest", "pytest-cov", "pytest-timeout"]
 
+[[package]]
+name = "markupsafe"
+version = "2.1.1"
+description = "Safely add untrusted strings to HTML/XML markup."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
 [[package]]
 name = "matplotlib-inline"
 version = "0.1.3"
@@ -517,6 +593,14 @@ python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 [package.dependencies]
 six = ">=1.5"
 
+[[package]]
+name = "pytz"
+version = "2022.1"
+description = "World timezone definitions, modern and historical"
+category = "main"
+optional = false
+python-versions = "*"
+
 [[package]]
 name = "pywin32"
 version = "304"
@@ -653,10 +737,33 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "werkzeug"
+version = "2.1.2"
+description = "The comprehensive WSGI web application library."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+watchdog = ["watchdog"]
+
+[[package]]
+name = "zipp"
+version = "3.8.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
+
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "83be0a029b324415badfd26479b415852946c927f43f7f677308f7135f7c8596"
+content-hash = "9f4cc03d98c0330f2704b5d44ef2354b0c9c91532b16ffc0aed0bd99ee7b4cc2"
 
 [metadata.files]
 appnope = [
@@ -735,6 +842,10 @@ charset-normalizer = [
     {file = "charset-normalizer-2.0.12.tar.gz", hash = "sha256:2857e29ff0d34db842cd7ca3230549d1a697f96ee6d3fb071cfa6c7393832597"},
     {file = "charset_normalizer-2.0.12-py3-none-any.whl", hash = "sha256:6881edbebdb17b39b4eaaa821b438bf6eddffb4468cf344f09f89def34a8b1df"},
 ]
+click = [
+    {file = "click-8.1.3-py3-none-any.whl", hash = "sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48"},
+    {file = "click-8.1.3.tar.gz", hash = "sha256:7682dc8afb30297001674575ea00d1814d808d6a36af415a82bd481d37ba7b8e"},
+]
 colorama = [
     {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
@@ -771,6 +882,10 @@ executing = [
     {file = "executing-0.8.3-py2.py3-none-any.whl", hash = "sha256:d1eef132db1b83649a3905ca6dd8897f71ac6f8cac79a7e58a1a09cf137546c9"},
     {file = "executing-0.8.3.tar.gz", hash = "sha256:c6554e21c6b060590a6d3be4b82fb78f8f0194d809de5ea7df1c093763311501"},
 ]
+flask = [
+    {file = "Flask-2.1.2-py3-none-any.whl", hash = "sha256:fad5b446feb0d6db6aec0c3184d16a8c1f6c3e464b511649c8918a9be100b4fe"},
+    {file = "Flask-2.1.2.tar.gz", hash = "sha256:315ded2ddf8a6281567edb27393010fe3406188bafbfe65a3339d5787d89e477"},
+]
 google-api-core = [
     {file = "google-api-core-2.7.3.tar.gz", hash = "sha256:17957f0704cbe95bd2ce25019efd2046423978594d181d4263e5dcffd2dbbc79"},
     {file = "google_api_core-2.7.3-py3-none-any.whl", hash = "sha256:bb40d2d6412c77c367943b88d08323091d724deaea96892fff4a1ebd06f6e5be"},
@@ -803,6 +918,10 @@ idna = [
     {file = "idna-3.3-py3-none-any.whl", hash = "sha256:84d9dd047ffa80596e0f246e2eab0b391788b0503584e8945f2368256d2735ff"},
     {file = "idna-3.3.tar.gz", hash = "sha256:9d643ff0a55b762d5cdb124b8eaa99c66322e2157b69160bc32796e824360e6d"},
 ]
+importlib-metadata = [
+    {file = "importlib_metadata-4.11.3-py3-none-any.whl", hash = "sha256:1208431ca90a8cca1a6b8af391bb53c1a2db74e5d1cef6ddced95d4b2062edc6"},
+    {file = "importlib_metadata-4.11.3.tar.gz", hash = "sha256:ea4c597ebf37142f827b8f39299579e31685c31d3a438b59f469406afd0f2539"},
+]
 ipykernel = [
     {file = "ipykernel-6.13.0-py3-none-any.whl", hash = "sha256:2b0987af43c0d4b62cecb13c592755f599f96f29aafe36c01731aaa96df30d39"},
     {file = "ipykernel-6.13.0.tar.gz", hash = "sha256:0e28273e290858393e86e152b104e5506a79c13d25b951ac6eca220051b4be60"},
@@ -811,10 +930,18 @@ ipython = [
     {file = "ipython-8.3.0-py3-none-any.whl", hash = "sha256:341456643a764c28f670409bbd5d2518f9b82c013441084ff2c2fc999698f83b"},
     {file = "ipython-8.3.0.tar.gz", hash = "sha256:807ae3cf43b84693c9272f70368440a9a7eaa2e7e6882dad943c32fbf7e51402"},
 ]
+itsdangerous = [
+    {file = "itsdangerous-2.1.2-py3-none-any.whl", hash = "sha256:2c2349112351b88699d8d4b6b075022c0808887cb7ad10069318a8b0bc88db44"},
+    {file = "itsdangerous-2.1.2.tar.gz", hash = "sha256:5dbbc68b317e5e42f327f9021763545dc3fc3bfe22e6deb96aaf1fc38874156a"},
+]
 jedi = [
     {file = "jedi-0.18.1-py2.py3-none-any.whl", hash = "sha256:637c9635fcf47945ceb91cd7f320234a7be540ded6f3e99a50cb6febdfd1ba8d"},
     {file = "jedi-0.18.1.tar.gz", hash = "sha256:74137626a64a99c8eb6ae5832d99b3bdd7d29a3850fe2aa80a4126b2a7d949ab"},
 ]
+jinja2 = [
+    {file = "Jinja2-3.1.2-py3-none-any.whl", hash = "sha256:6088930bfe239f0e6710546ab9c19c9ef35e29792895fed6e6e31a023a182a61"},
+    {file = "Jinja2-3.1.2.tar.gz", hash = "sha256:31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852"},
+]
 jupyter-client = [
     {file = "jupyter_client-7.3.1-py3-none-any.whl", hash = "sha256:404abe552540aff3527e66e16beb114b6b4ff58479d51a301f4eb9701e4f52ef"},
     {file = "jupyter_client-7.3.1.tar.gz", hash = "sha256:05d4ff6a0ade25138c6bb0fbeac7ddc26b5fe835e7dd816b64b4a45b931bdc0b"},
@@ -823,6 +950,48 @@ jupyter-core = [
     {file = "jupyter_core-4.10.0-py3-none-any.whl", hash = "sha256:e7f5212177af7ab34179690140f188aa9bf3d322d8155ed972cbded19f55b6f3"},
     {file = "jupyter_core-4.10.0.tar.gz", hash = "sha256:a6de44b16b7b31d7271130c71a6792c4040f077011961138afed5e5e73181aec"},
 ]
+markupsafe = [
+    {file = "MarkupSafe-2.1.1-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:86b1f75c4e7c2ac2ccdaec2b9022845dbb81880ca318bb7a0a01fbf7813e3812"},
+    {file = "MarkupSafe-2.1.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:f121a1420d4e173a5d96e47e9a0c0dcff965afdf1626d28de1460815f7c4ee7a"},
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+    {file = "MarkupSafe-2.1.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:b87db4360013327109564f0e591bd2a3b318547bcef31b468a92ee504d07ae4f"},
+    {file = "MarkupSafe-2.1.1-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:99a2a507ed3ac881b975a2976d59f38c19386d128e7a9a18b7df6fff1fd4c1d6"},
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+    {file = "MarkupSafe-2.1.1-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:8e3dcf21f367459434c18e71b2a9532d96547aef8a871872a5bd69a715c15f96"},
+    {file = "MarkupSafe-2.1.1-cp39-cp39-win32.whl", hash = "sha256:d4306c36ca495956b6d568d276ac11fdd9c30a36f1b6eb928070dc5360b22e1c"},
+    {file = "MarkupSafe-2.1.1-cp39-cp39-win_amd64.whl", hash = "sha256:46d00d6cfecdde84d40e572d63735ef81423ad31184100411e6e3388d405e247"},
+    {file = "MarkupSafe-2.1.1.tar.gz", hash = "sha256:7f91197cc9e48f989d12e4e6fbc46495c446636dfc81b9ccf50bb0ec74b91d4b"},
+]
 matplotlib-inline = [
     {file = "matplotlib-inline-0.1.3.tar.gz", hash = "sha256:a04bfba22e0d1395479f866853ec1ee28eea1485c1d69a6faf00dc3e24ff34ee"},
     {file = "matplotlib_inline-0.1.3-py3-none-any.whl", hash = "sha256:aed605ba3b72462d64d475a21a9296f400a19c4f74a31b59103d2a99ffd5aa5c"},
@@ -973,6 +1142,10 @@ python-dateutil = [
     {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
     {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},
 ]
+pytz = [
+    {file = "pytz-2022.1-py2.py3-none-any.whl", hash = "sha256:e68985985296d9a66a881eb3193b0906246245294a881e7c8afe623866ac6a5c"},
+    {file = "pytz-2022.1.tar.gz", hash = "sha256:1e760e2fe6a8163bc0b3d9a19c4f84342afa0a2affebfaa84b01b978a02ecaa7"},
+]
 pywin32 = [
     {file = "pywin32-304-cp310-cp310-win32.whl", hash = "sha256:3c7bacf5e24298c86314f03fa20e16558a4e4138fc34615d7de4070c23e65af3"},
     {file = "pywin32-304-cp310-cp310-win_amd64.whl", hash = "sha256:4f32145913a2447736dad62495199a8e280a77a0ca662daa2332acf849f0be48"},
@@ -1117,3 +1290,11 @@ wcwidth = [
     {file = "wcwidth-0.2.5-py2.py3-none-any.whl", hash = "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784"},
     {file = "wcwidth-0.2.5.tar.gz", hash = "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"},
 ]
+werkzeug = [
+    {file = "Werkzeug-2.1.2-py3-none-any.whl", hash = "sha256:72a4b735692dd3135217911cbeaa1be5fa3f62bffb8745c5215420a03dc55255"},
+    {file = "Werkzeug-2.1.2.tar.gz", hash = "sha256:1ce08e8093ed67d638d63879fd1ba3735817f7a80de3674d293f5984f25fb6e6"},
+]
+zipp = [
+    {file = "zipp-3.8.0-py3-none-any.whl", hash = "sha256:c4f6e5bbf48e74f7a38e7cc5b0480ff42b0ae5178957d564d18932525d5cf099"},
+    {file = "zipp-3.8.0.tar.gz", hash = "sha256:56bf8aadb83c24db6c4b577e13de374ccfb67da2078beba1d037c17980bf43ad"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index c908bc2..f05afb1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,6 +9,8 @@ python = "^3.8"
 google-api-python-client = ">=2,<3"
 google-auth-httplib2 = ">=0.1,<0.2"
 google-auth-oauthlib = ">=0.5,<0.6"
+Flask = ">=2,<3"
+pytz = "*"
 
 [tool.poetry.dev-dependencies]
 ipykernel = ">=6,<7"