diff --git a/injected/src/features/broker-protection.js b/injected/src/features/broker-protection.js
index 05294dc88e..5a38d441a9 100644
--- a/injected/src/features/broker-protection.js
+++ b/injected/src/features/broker-protection.js
@@ -2,6 +2,7 @@ import ContentFeature from '../content-feature.js';
 import { execute } from './broker-protection/execute.js';
 import { retry } from '../timer-utils.js';
 import { ErrorResponse } from './broker-protection/types.js';
+import { detectWebInterference } from '../utils/web-interference-detection/detector-service.js';
 
 export class ActionExecutorBase extends ContentFeature {
     /**
@@ -91,6 +92,20 @@ export default class BrokerProtection extends ActionExecutorBase {
             const { action, data } = params.state;
             return await this.processActionAndNotify(action, data);
         });
+
+        this.messaging.subscribe('detectInterference', (/** @type {any} */ params) => {
+            console.log('[BrokerProtection] detectInterference request received from native', { params });
+            try {
+                const result = detectWebInterference(params);
+                console.log('[BrokerProtection] Sending detection result to native:', result);
+                return this.messaging.notify('interferenceDetected', result);
+            } catch (error) {
+                console.error('[BrokerProtection] Error detecting interference:', error);
+                return this.messaging.notify('interferenceDetectionError', {
+                    error: error.toString(),
+                });
+            }
+        });
     }
 
     /**
diff --git a/injected/src/utils/web-interference-detection/detector-service.js b/injected/src/utils/web-interference-detection/detector-service.js
new file mode 100644
index 0000000000..1a8be635b9
--- /dev/null
+++ b/injected/src/utils/web-interference-detection/detector-service.js
@@ -0,0 +1,106 @@
+import { detectBotInterference } from './interference-types/bot-detection.js';
+import { InterferenceMonitor } from './interference-monitor.js';
+
+export function createEmptyResult(type) {
+    return {
+        detected: false,
+        interferenceType: type,
+        timestamp: Date.now(),
+    };
+}
+
+export const typeDetectorsMap = {
+    bot_detection: detectBotInterference,
+    youtube_ads: () => createEmptyResult('youtube_ads'),
+    video_buffering: () => createEmptyResult('video_buffering'),
+    fraud_detection: () => createEmptyResult('fraud_detection'),
+};
+
+export function detectTypes(types) {
+    return Object.fromEntries(
+        types.map(type => [type, typeDetectorsMap[type]()])
+    );
+}
+
+/**
+ * Detect web interference (CAPTCHAs, ads, buffering, fraud detection)
+ *
+ * @param {Object} config - Detection configuration
+ * @param {string[]} config.types - Array of interference types to detect
+ *                                   ['bot_detection', 'youtube_ads', 'video_buffering', 'fraud_detection']
+ * @param {boolean} [config.observeDOMChanges] - Enable continuous monitoring via MutationObserver
+ *                                                Default: false (one-time detection)
+ * @param {Function} [config.onDetectionChange] - Callback when detection changes (required if observeDOMChanges=true)
+ *
+ * @returns {Object|Function} Results object (one-time) or unsubscribe function (observeDOMChanges=true)
+ *
+ * Current return structure:
+ * {
+ *   bot_detection: {
+ *     detected: boolean,
+ *     interferenceType: 'bot_detection',
+ *     results: [
+ *       { vendor: 'cloudflare', detected: true, challengeType?: 'turnstile' },
+ *       { vendor: 'hcaptcha', detected: true, challengeType?: 'widget' }
+ *     ],
+ *     timestamp: number
+ *   }
+ * }
+ *
+ * Future return structure (enhanced detection):
+ * {
+ *   bot_detection: {
+ *     detected: boolean,
+ *     interferenceType: 'bot_detection',
+ *     results: [
+ *       {
+ *         vendor: 'cloudflare',
+ *         detected: true,
+ *         challengeType: 'turnstile',
+ *         challengeState: 'unsolved',
+ *         confidence: 'high',
+ *         signals: { scripts: true, windowObjects: true, domElements: true }
+ *       },
+ *       {
+ *         vendor: 'cloudflare',
+ *         detected: true,
+ *         challengeType: 'challenge_page',
+ *         challengeState: null,
+ *         confidence: 'medium',
+ *         signals: { scripts: true, windowObjects: false, domElements: true }
+ *       }
+ *     ],
+ *     timestamp: number
+ *   }
+ * }
+ *
+ * Multiple results from same vendor represent different challenge types
+ * (e.g., Cloudflare Turnstile + Cloudflare Challenge Page), not multiple instances
+ * of the same type.
+ */
+export function detectWebInterference(config) {
+    if (config.observeDOMChanges) {
+        const monitor = InterferenceMonitor.getInstance({ detectFn: detectTypes });
+        return monitor.addListener(config, config.onDetectionChange);
+    }
+
+    return detectTypes(config.types);
+}
+
+/**
+ * Future: Continuous monitoring with MutationObserver
+ *
+ * InterferenceMonitor class available in interference-monitor.js.
+ * Uses singleton pattern so all features share one MutationObserver.
+ *
+ * Usage example:
+ *   const unsubscribe = detectWebInterference({
+ *       types: ['bot_detection'],
+ *       observeDOMChanges: true,
+ *       onDetectionChange: (results) => {
+ *           messaging.notify('interferenceChanged', results)
+ *       }
+ *   })
+ *
+ *   unsubscribe()
+ */
diff --git a/injected/src/utils/web-interference-detection/interference-monitor.js b/injected/src/utils/web-interference-detection/interference-monitor.js
new file mode 100644
index 0000000000..0de715121e
--- /dev/null
+++ b/injected/src/utils/web-interference-detection/interference-monitor.js
@@ -0,0 +1,64 @@
+/**
+ * Prototype for continuous monitoring with MutationObserver (later phase)
+ */
+export class InterferenceMonitor {
+    static instance;
+
+    constructor({ detectFn }) {
+        this.detectFn = detectFn;
+        this.listeners = new Map();
+        this.observer = null;
+        this.debounceTimer = null;
+    }
+
+    static getInstance({ detectFn }) {
+        if (!InterferenceMonitor.instance) {
+            InterferenceMonitor.instance = new InterferenceMonitor({ detectFn });
+        }
+        return InterferenceMonitor.instance;
+    }
+
+    addListener(config, onDetectionChange) {
+        const id = Symbol();
+        this.listeners.set(id, { types: config.types, callback: onDetectionChange });
+
+        if (!this.observer) {
+            this.start();
+        }
+
+        return () => {
+            this.listeners.delete(id);
+            if (this.listeners.size === 0) {
+                this.stop();
+            }
+        };
+    }
+
+    start() {
+        this.observer = new MutationObserver(() => {
+            if (this.debounceTimer) {
+                clearTimeout(this.debounceTimer);
+            }
+
+            this.debounceTimer = setTimeout(() => {
+                for (const [id, { types, callback }] of this.listeners) {
+                    const results = this.detectFn(types);
+                    callback(results);
+                }
+            }, 500);
+        });
+
+        this.observer.observe(document.body, { childList: true, subtree: true });
+    }
+
+    stop() {
+        if (this.observer) {
+            this.observer.disconnect();
+            this.observer = null;
+        }
+        if (this.debounceTimer) {
+            clearTimeout(this.debounceTimer);
+            this.debounceTimer = null;
+        }
+    }
+}
diff --git a/injected/src/utils/web-interference-detection/interference-types/bot-detection.js b/injected/src/utils/web-interference-detection/interference-types/bot-detection.js
new file mode 100644
index 0000000000..86906d7a6f
--- /dev/null
+++ b/injected/src/utils/web-interference-detection/interference-types/bot-detection.js
@@ -0,0 +1,30 @@
+import { detectCloudflareTurnstile, detectCloudflareChallengePage } from '../vendors/cloudflare.js';
+import { detectHCaptcha } from '../vendors/hcaptcha.js';
+
+const challengeDetectorsMap = {
+    cloudflare_turnstile: detectCloudflareTurnstile,
+    cloudflare_challenge_page: detectCloudflareChallengePage,
+    hcaptcha: detectHCaptcha,
+};
+
+export function detectBotInterference() {
+    const results = [];
+
+    for (const [challengeName, detector] of Object.entries(challengeDetectorsMap)) {
+        try {
+            const result = detector();
+            if (result.detected) {
+                results.push(result);
+            }
+        } catch (error) {
+            console.warn(`[web-interference-detection] ${challengeName} detector failed:`, error);
+        }
+    }
+
+    return {
+        detected: results.length > 0,
+        interferenceType: 'bot_detection',
+        results,
+        timestamp: Date.now(),
+    };
+}
diff --git a/injected/src/utils/web-interference-detection/vendors/cloudflare.js b/injected/src/utils/web-interference-detection/vendors/cloudflare.js
new file mode 100644
index 0000000000..d8b716836c
--- /dev/null
+++ b/injected/src/utils/web-interference-detection/vendors/cloudflare.js
@@ -0,0 +1,29 @@
+const TURNSTILE_SELECTORS = ['.cf-turnstile'];
+const TURNSTILE_WINDOW_OBJECTS = ['turnstile'];
+
+const CHALLENGE_PAGE_SELECTORS = ['#challenge-form', '.cf-browser-verification', '#cf-wrapper'];
+const CHALLENGE_PAGE_WINDOW_OBJECTS = ['_cf_chl_opt', '__CF$cv$params', 'cfjsd'];
+
+export function detectCloudflareTurnstile() {
+    const hasDOM = TURNSTILE_SELECTORS.some((selector) => document.querySelector(selector));
+    const hasWindowObjects = TURNSTILE_WINDOW_OBJECTS.some((object) => typeof window[object] !== 'undefined');
+    const detected = hasDOM || hasWindowObjects;
+
+    return {
+        detected,
+        vendor: 'cloudflare',
+        challengeType: 'turnstile',
+    };
+}
+
+export function detectCloudflareChallengePage() {
+    const hasDOM = CHALLENGE_PAGE_SELECTORS.some((selector) => document.querySelector(selector));
+    const hasWindowObjects = CHALLENGE_PAGE_WINDOW_OBJECTS.some((object) => typeof window[object] !== 'undefined');
+    const detected = hasDOM || hasWindowObjects;
+
+    return {
+        detected,
+        vendor: 'cloudflare',
+        challengeType: 'challenge_page',
+    };
+}
diff --git a/injected/src/utils/web-interference-detection/vendors/hcaptcha.js b/injected/src/utils/web-interference-detection/vendors/hcaptcha.js
new file mode 100644
index 0000000000..4f3fb1bccb
--- /dev/null
+++ b/injected/src/utils/web-interference-detection/vendors/hcaptcha.js
@@ -0,0 +1,25 @@
+const DOM_SELECTORS = ['.h-captcha', '[data-hcaptcha-widget-id]'];
+const SCRIPT_DOMAINS = ['hcaptcha.com', 'assets.hcaptcha.com'];
+const WINDOW_OBJECTS = ['hcaptcha'];
+
+function detectDOM() {
+    return DOM_SELECTORS.some((selector) => document.querySelector(selector));
+}
+
+function detectScripts() {
+    return SCRIPT_DOMAINS.some((domain) => document.querySelectorAll(`script[src*="${domain}"]`).length > 0);
+}
+
+function detectWindowObjects() {
+    return WINDOW_OBJECTS.some((object) => typeof window[object] !== 'undefined');
+}
+
+export function detectHCaptcha() {
+    const detected = detectDOM() || detectScripts() || detectWindowObjects();
+
+    return {
+        detected,
+        vendor: 'hcaptcha',
+        challengeType: 'widget'
+    };
+}