diff --git a/src/hooks.server.ts b/src/hooks.server.ts
new file mode 100644
index 0000000..e89b06e
--- /dev/null
+++ b/src/hooks.server.ts
@@ -0,0 +1,119 @@
+import { type Handle } from '@sveltejs/kit';
+
+const rateLimitStore = new Map<string, { count: number; resetTime: number }>();
+
+const RATE_LIMIT_WINDOW = 1000; // ms
+const RATE_LIMIT_MAX_REQUESTS = 10;
+
+function getClientIP(request: Request): string {
+	const forwarded = request.headers.get('x-forwarded-for');
+	if (forwarded) {
+		return forwarded.split(',')[0].trim();
+	}
+	
+	const realIP = request.headers.get('x-real-ip');
+	if (realIP) {
+		return realIP;
+	}
+	
+	return 'unknown';
+}
+
+function isRateLimited(clientIP: string): boolean {
+	const now = Date.now();
+	const key = clientIP;
+	
+	const record = rateLimitStore.get(key);
+	
+	if (!record || now > record.resetTime) {
+		// Reset or create new record
+		rateLimitStore.set(key, { count: 1, resetTime: now + RATE_LIMIT_WINDOW });
+		return false;
+	}
+	
+	if (record.count >= RATE_LIMIT_MAX_REQUESTS) {
+		return true;
+	}
+	
+	record.count++;
+	return false;
+}
+
+/** 
+ * Clean up limit store every minute
+ */
+setInterval(() => {
+	const now = Date.now();
+	for (const [key, record] of rateLimitStore.entries()) {
+		if (now > record.resetTime) {
+			rateLimitStore.delete(key);
+		}
+	}
+}, 60000);
+
+/**
+ * Hook to add CORS and security headers and to perform rate limiting
+ * @param event Event containing a request
+ */
+export const handle: Handle = async ({ event, resolve }) => {
+	const { request } = event;
+	const clientIP = getClientIP(request);
+	
+	if (isRateLimited(clientIP)) {
+		return new Response('Too Many Requests', {
+			status: 429,
+			headers: {
+				'Retry-After': '1',
+				'Content-Type': 'text/plain'
+			}
+		});
+	}
+	
+	if (request.method === 'OPTIONS') {
+		return new Response(null, {
+			headers: {
+				'Access-Control-Allow-Origin': '*', // TODO: Should be limited to own server and registered webhooks etc.
+				'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, PATCH, OPTIONS',
+				'Access-Control-Allow-Headers': 'Content-Type, Authorization, X-Requested-With',
+				'Access-Control-Max-Age': '86400'
+			}
+		});
+	}
+	
+	const response = await resolve(event);
+	
+	// TODO: These has to be rechecked and coordinated with caddy's configuration
+	response.headers.set('X-Frame-Options', 'DENY');
+	response.headers.set('X-Content-Type-Options', 'nosniff');
+	response.headers.set('X-XSS-Protection', '1; mode=block');
+	response.headers.set('Referrer-Policy', 'strict-origin-when-cross-origin');
+	response.headers.set('Permissions-Policy', 'camera=(), microphone=(), geolocation=()');
+	
+	if (event.url.protocol === 'https:') {
+		response.headers.set('Strict-Transport-Security', 'max-age=31536000; includeSubDomains; preload');
+	}
+	
+	const cspDirectives = [
+		"default-src 'self'",
+		"script-src 'self' 'unsafe-inline' https://unpkg.com", // Allow inline scripts and unpkg CDN (for Swagger)
+		"style-src 'self' 'unsafe-inline' https://unpkg.com", 
+		"img-src 'self' data: https:",
+		"font-src 'self' data: https://unpkg.com",
+		"connect-src 'self'",
+		"media-src 'self'",
+		"object-src 'none'",
+		"base-uri 'self'",
+		"form-action 'self'",
+		"frame-ancestors 'none'",
+		"upgrade-insecure-requests"
+	];
+	response.headers.set('Content-Security-Policy', cspDirectives.join('; '));
+	
+	if (event.url.pathname.startsWith('/api/')) {
+		response.headers.set('Access-Control-Allow-Origin', '*'); // TODO: Should be limited to own server and registered webhooks etc.
+		response.headers.set('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, PATCH, OPTIONS');
+		response.headers.set('Access-Control-Allow-Headers', 'Content-Type, Authorization, X-Requested-With');
+	}
+	
+	return response;
+};
\ No newline at end of file
diff --git a/src/lib/server/openapi.ts b/src/lib/server/openapi.ts
new file mode 100644
index 0000000..31aa141
--- /dev/null
+++ b/src/lib/server/openapi.ts
@@ -0,0 +1,117 @@
+export type JsonSchema = {
+	type?: 'string' | 'number' | 'integer' | 'boolean' | 'array' | 'object';
+	properties?: Record<string, JsonSchema>;
+	items?: JsonSchema;
+	required?: string[];
+	format?: string;
+	description?: string;
+	example?: unknown;
+	enum?: unknown[];
+	$ref?: string;
+};
+
+export interface OpenApiResponse {
+	description: string;
+	content?: Record<string, {
+		schema: JsonSchema;
+		example?: unknown;
+	}>;
+}
+
+export interface OpenApiParameter {
+	name: string;
+	in: 'query' | 'path' | 'header';
+	description?: string;
+	required?: boolean;
+	schema: JsonSchema;
+}
+
+export interface OpenApiRequestBody {
+	description?: string;
+	content: Record<string, {
+		schema: JsonSchema;
+		example?: unknown;
+	}>;
+}
+
+export interface OpenApiOperation {
+	summary?: string;
+	description?: string;
+	tags?: string[];
+	responses?: Record<string, OpenApiResponse>;
+	parameters?: OpenApiParameter[];
+	requestBody?: OpenApiRequestBody;
+}
+
+const apiOperationsRegistry = new Map<string, OpenApiOperation>();
+
+export function registerOpenAPIRoute(path: string, method: string, operation: OpenApiOperation) {
+	const key = `${method.toUpperCase()} ${path}`;
+	apiOperationsRegistry.set(key, operation);
+}
+
+export function getApiOperations(): Map<string, OpenApiOperation> {
+	return apiOperationsRegistry;
+}
+
+export function generateOpenApiSpec() {
+	const paths: Record<string, Record<string, OpenApiOperation>> = {};
+	
+	// Convert registered operations to OpenAPI paths
+	for (const [key, operation] of apiOperationsRegistry.entries()) {
+		const [method, path] = key.split(' ', 2);
+		if (!paths[path]) {
+			paths[path] = {};
+		}
+		paths[path][method.toLowerCase()] = operation;
+	}
+	
+	return {
+		openapi: '3.0.0',
+		info: {
+			title: 'Open Reception API',
+			description: 'End-to-end encrypted appointment booking platform',
+			version: '0.0.1',
+			license: {
+				name: 'AGPL-3.0',
+				url: 'https://www.gnu.org/licenses/agpl-3.0.html'
+			}
+		},
+		servers: [
+			{
+				url: '/api',
+				description: 'API Server'
+			}
+		],
+		paths,
+		components: {
+			schemas: {
+				Error: {
+					type: 'object',
+					properties: {
+						error: { type: 'string', description: 'Error message' },
+						code: { type: 'string', description: 'Error code' }
+					},
+					required: ['error']
+				},
+				HealthStatus: {
+					type: 'object',
+					properties: {
+						core: { type: 'boolean', description: 'Core service status' },
+						database: { type: 'boolean', description: 'Database connectivity status' },
+						memory: { type: 'integer', description: 'Free memory in megabytes' },
+						load: { type: 'number', format: 'float', description: 'Average CPU load' }
+					},
+					required: ['core', 'database', 'memory', 'load']
+				}
+			}
+		},
+		tags: [
+			{ name: 'Health', description: 'Health check and monitoring endpoints' },
+			{ name: 'Appointments', description: 'Appointment management endpoints' },
+			{ name: 'Clients', description: 'Client management endpoints' },
+			{ name: 'Channels', description: 'Channel management endpoints' },
+			{ name: 'Questionnaires', description: 'Questionnaire management endpoints' }
+		]
+	};
+}
\ No newline at end of file
diff --git a/src/routes/api/docs/+server.ts b/src/routes/api/docs/+server.ts
new file mode 100644
index 0000000..3da17ad
--- /dev/null
+++ b/src/routes/api/docs/+server.ts
@@ -0,0 +1,61 @@
+
+export async function GET() {
+    const html = `<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Open Reception API Documentation</title>
+    <link rel="stylesheet" type="text/css" href="https://unpkg.com/swagger-ui-dist@5.10.3/swagger-ui.css" />
+    <style>
+        html {
+            box-sizing: border-box;
+            overflow: -moz-scrollbars-vertical;
+            overflow-y: scroll;
+        }
+        *, *:before, *:after {
+            box-sizing: inherit;
+        }
+        body {
+            margin: 0;
+            background: #fafafa;
+        }
+    </style>
+</head>
+<body>
+    <div id="swagger-ui"></div>
+    <script src="https://unpkg.com/swagger-ui-dist@5.10.3/swagger-ui-bundle.js"></script>
+    <script src="https://unpkg.com/swagger-ui-dist@5.10.3/swagger-ui-standalone-preset.js"></script>
+    <script>
+        window.onload = function() {
+            const ui = SwaggerUIBundle({
+                url: '/api/openapi.json',
+                dom_id: '#swagger-ui',
+                deepLinking: true,
+                presets: [
+                    SwaggerUIBundle.presets.apis,
+                    SwaggerUIStandalonePreset
+                ],
+                plugins: [
+                    SwaggerUIBundle.plugins.DownloadUrl
+                ],
+                layout: "StandaloneLayout",
+                tryItOutEnabled: true,
+                supportedSubmitMethods: ['get', 'post', 'put', 'delete', 'patch'],
+                docExpansion: 'list',
+                filter: true,
+                showRequestHeaders: true,
+                showCommonExtensions: true,
+                validatorUrl: null
+            });
+        };
+    </script>
+</body>
+</html>`;
+
+    return new Response(html, {
+        headers: {
+            'Content-Type': 'text/html'
+        }
+    });
+}
\ No newline at end of file
diff --git a/src/routes/api/health/services/+server.ts b/src/routes/api/health/services/+server.ts
new file mode 100644
index 0000000..bf22f54
--- /dev/null
+++ b/src/routes/api/health/services/+server.ts
@@ -0,0 +1,69 @@
+import { json } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { sql } from 'drizzle-orm';
+import os from 'os';
+import { registerOpenAPIRoute } from '$lib/server/openapi';
+
+registerOpenAPIRoute('/health/services', 'GET', {
+    summary: 'Get service health status',
+    description: 'Returns the health status of core services including database connectivity, memory usage, and CPU load',
+    tags: ['Health'],
+    responses: {
+        '200': {
+            description: 'Service health status',
+            content: {
+                'application/json': {
+                    schema: { $ref: '#/components/schemas/HealthStatus' },
+                    example: {
+                        core: true,
+                        database: true,
+                        memory: 2048,
+                        load: 0.75
+                    }
+                }
+            }
+        },
+        '429': {
+            description: 'Too Many Requests - Rate limit exceeded',
+            content: {
+                'text/plain': {
+                    schema: { type: 'string' },
+                    example: 'Too Many Requests'
+                }
+            }
+        },
+        '500': {
+            description: 'Internal Server Error',
+            content: {
+                'application/json': {
+                    schema: { $ref: '#/components/schemas/Error' }
+                }
+            }
+        }
+    }
+});
+
+export class ServiceHealthResponse {
+    core: boolean = true;
+    database: boolean = false;
+    memory: number = 0;
+    load: number = 0;
+}
+
+export async function GET() {
+    const serviceHealth = new ServiceHealthResponse()
+
+    try {
+        await db.execute(sql`SELECT 1`);
+        serviceHealth.database = true;
+    } catch {
+        serviceHealth.database = false;
+    }
+
+    serviceHealth.memory = Math.round(os.freemem() / 1024 / 1024);
+
+    const loadAvg = os.loadavg();
+    serviceHealth.load = Math.round(loadAvg[0] * 100) / 100;
+
+    return json(serviceHealth);
+}
\ No newline at end of file
diff --git a/src/routes/api/openapi.json/+server.ts b/src/routes/api/openapi.json/+server.ts
new file mode 100644
index 0000000..c203418
--- /dev/null
+++ b/src/routes/api/openapi.json/+server.ts
@@ -0,0 +1,10 @@
+import { json } from '@sveltejs/kit';
+import { generateOpenApiSpec } from '$lib/server/openapi.js';
+
+// ATTENTION: All routes need to be imported here to make sure they're added to the OpenAPI spec
+import '../health/services/+server.js';
+
+export async function GET() {
+    const spec = generateOpenApiSpec();
+    return json(spec);
+}
\ No newline at end of file