WebRTC + AI Host Overlay for TikTok-Style Live Shopping in 2026

Live shopping in 2026 is no longer a single human host yelling at a camera. The winning format is a real human (or AI avatar) on a WebRTC ingest, with an AI co-host overlay that watches chat, answers product questions, and pins the right product tag the moment a viewer asks "what size?". Latency budget: under 300 ms for the AI overlay, under one second glass-to-glass for the video.

Use case

A Shopify merchant runs a 90-minute live drop on TikTok, Instagram, and their own site simultaneously. A single human host walks through product, but every viewer's chat question is answered in under two seconds by an AI co-host that knows the catalog, inventory, and shipping zones. When a viewer types "do you have this in size 10?", the AI replies in chat, pins the correct product card on screen, and updates the live cart for that user. According to 2026 industry reports, AI livestreaming for TikTok Shop is "production-ready infrastructure for serious sellers", with AI overlays delivering up to 40% longer watch times versus pre-recorded video.

The unlock is the overlay layer. The video itself is just WebRTC over WHIP into a CDN; the AI is a parallel WebSocket pipe that reads chat, queries inventory, and writes overlay events back to the player.

Architecture

```mermaid flowchart LR Host[Human Host Browser] -- WHIP ingest --> Edge[Cloudflare Stream Realtime] Edge -- WHEP --> Viewer[Viewer Browser] Viewer -- chat WebSocket --> Bot[CallSphere AI Co-host] Bot -- catalog query --> Catalog[(Shopify + 115+ tables)] Bot -- overlay event --> NATS[NATS bus] NATS -- pin product --> Player[WHEP Player Overlay] Bot -- analytics --> Audit[(audit log)] ```

CallSphere implementation

CallSphere's live-commerce stack reuses the same WebRTC + Pion Go gateway 1.23 + NATS pipeline that powers OneRoof real estate, but the SFU role is replaced by a WHIP/WHEP edge (Cloudflare Realtime or Mux) so the human host can ingest from any browser:

• Real Estate (OneRoof) parallel — The same Pion Go gateway 1.23 + NATS pattern that powers OneRoof voice calls drives the AI co-host bus for live shopping. See /industries/real-estate.
• /demo browser path — Test the AI overlay end-to-end at /demo without a TikTok account; it runs the same chat+overlay pipeline against a public catalog.
• 115+ database tables capture every chat message, product pin, and conversion. 6 verticals (real estate, healthcare, behavioral health, legal, salon, insurance) reuse the overlay layer for live open houses, live class bookings, and live consult triage.

Explore a live demo and compare current plans to find the right fit for your business.

Build steps

```typescript // 1. Host browser ingests via WHIP const pc = new RTCPeerConnection({ iceServers }); pc.addTransceiver("video", { direction: "sendonly" }); pc.addTransceiver("audio", { direction: "sendonly" }); const offer = await pc.createOffer(); await pc.setLocalDescription(offer); const res = await fetch("https://stream.callsphere.ai/whip/live", { method: "POST", headers: { "Content-Type": "application/sdp", "Authorization": "Bearer " + token }, body: offer.sdp, }); await pc.setRemoteDescription({ type: "answer", sdp: await res.text() });

// 2. Viewer chat triggers AI co-host chatWS.onmessage = async (ev) => { const { user, text } = JSON.parse(ev.data); const reply = await fetch("/api/agents/cohost", { method: "POST", body: JSON.stringify({ text, user, sessionId }), }).then(r => r.json()); if (reply.pinProductId) overlayWS.send(JSON.stringify({ pin: reply.pinProductId })); chatWS.send(JSON.stringify({ from: "AI", text: reply.text })); }; ```

FAQ

How is this different from a chatbot? A chatbot replies in chat; the AI host overlay also pins on-screen product cards, updates the live cart, and triggers room-wide flash discounts.

Will TikTok block this? TikTok Shop's API permits AI affiliates and avatar hosts; AI livestreaming is explicitly supported in 2026 for TikTok Shop sellers in the UK and US.

What is the latency budget? Glass-to-glass video under 1 s via WHIP/WHEP; AI overlay events under 300 ms from chat send to product pin.

Do I need a CDN? Yes — direct WebRTC fan-out caps around a few thousand viewers per SFU; for 100k+ concurrent viewers use Cloudflare Stream Live or Mux.

Can I run a fully synthetic AI host? Yes — pair the overlay with a Soul Machines or HeyGen avatar pushing into the same WHIP ingest.

Sources

• https://syntopia.ai/ai-livestreaming-tiktok-shop/
• https://blog.cloudflare.com/webrtc-whip-whep-cloudflare-stream/
• https://www.dropified.com/blog/how-to-use-ai-video-agents-for-24-7-tiktok-live-streams/
• https://www.mux.com/interactive-live-streaming
• https://www.kolsprite.com/blog/2026-tiktok-live-commerce-trends

Explore a live demo and compare current plans to find the right fit for your business.