Add Face Liveness Detection to Any App in 10 Lines of Code (Free Tier Available)

Most biometric verification tools are either expensive, require a hardware SDK, or lock you into a proprietary platform. FaceID API is a free-tier REST API that adds face liveness detection to any web or mobile app. Here's exactly how it works. How the session model works Your API key never appears in frontend code or in a URL. Your backend ↓ POST /widget-session (X-API-Key: your_secret_key) FaceID Worker ↓ Returns { session_id, widget_url } Your frontend ↓ Opens widget_url in an iframe (no key in URL) User completes liveness ↓ postMessage({ type: 'FACEID_RESULT', result: {...} }) Your frontend ↓ Receives the result — no raw biometric data Node.js backend // Step 1: get a session (server-side only — never in the browser) const session = await fetch('https://face-worker.faceidentity.workers.dev/widget-session', { method: 'POST', headers: { 'X-API-Key': process.env.FACEID_API_KEY, 'Content-Type': 'application/json', }, body: JSON