Cold Open v1.0.0: built in one day at the Startup Speedrun Hackathon (Cloudflare HQ, Sep 28, 2026)
The agency that does the work before the sale. Agents scout real small businesses, read each brand from its own website, build a site, run it through a critic loop until it scores 85+, direct a hero image, write an honest pitch, and attach a Stripe checkout.
🎬 Watch the 3-minute demo
Download ColdOpen-demo.mp4 below. It is narrated real footage from the live app, with no mockups.
What's in v1.0.0
- Mission Control: a live map of the block, business cards, the agent channel over WebSocket, and a speedrun "Live challenge" split timer.
- Seven agents: Scout, Archivist, Builder, Critic, Director, Closer and CFO, plus an independent Brainbase second opinion via
POST /v2/threads. - Taste gate: up to 3 versions, with a banned AI-slop list and a fact-check for claims we can't source. The best version ships.
- Cloudflare: Worker plus one Agents SDK Durable Object (SQLite and WebSockets), and KV for media.
- Stripe (test mode): a Payment Link per business, verified through the Checkout Session API and HMAC-signed webhooks.
- LLM chain: Claude, then OpenAI, then Workers AI, chosen automatically. Hero images: FLUX, then gpt-image-1, then the business's own og:image.
- Every preview is labeled unofficial, carries
noindex, and has one-click removal.
Live results on Sep 28, 2026
- 24 businesses scouted and 16 sites built, for under $1 of model spend.
- Fastest build: 38.5 s.
- Critic loops: Arsicault Bakery 49 → 68 → 96, Tres 31 → 67 → 88.
Also attached: the 10-slide pitch deck (ColdOpen.pptx).