diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..a2a0c26
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,45 @@
+[build-system]
+requires = ["hatchling>=1.25"]
+build-backend = "hatchling.build"
+
+[project]
+name = "endpoint-monitor"
+version = "1.0.0"
+description = "Secure on-demand HTTP endpoint monitoring API"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+  "aiohttp>=3.10,<4",
+  "fastapi>=0.115,<1",
+  "pydantic-settings>=2.5,<3",
+  "uvicorn[standard]>=0.30,<1",
+]
+
+[project.optional-dependencies]
+dev = [
+  "httpx>=0.27,<1",
+  "mypy>=1.11,<2",
+  "pytest>=8.3,<9",
+  "pytest-asyncio>=0.24,<1",
+  "ruff>=0.6,<1",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["app"]
+
+[tool.pytest.ini_options]
+addopts = "-q"
+asyncio_mode = "auto"
+testpaths = ["tests"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "UP", "B", "ASYNC"]
+
+[tool.mypy]
+python_version = "3.12"
+strict = true
+packages = ["app"]