miniature

From a single photograph, we generate a 3:4 poster with "top half = original photo / bottom half = miniature isometric illustration of the subject." This is a format called ⟨Two Landscapes⟩.

• No membership registration required. Select a photo, pay 480 yen, and download in about 2 minutes
• High resolution (1536×2048px). No watermarks or logos
• Full refund if you're not satisfied

Technical Details

• Cloudflare Workers + D1 + R2 only. We haven't built a single server
• Generation uses OpenAI gpt-image-2 (26 yen per image, measured at 2 minutes)
• To avoid the 10ms CPU/request limit of the Workers free tier, we pass the 6MB JSON response directly to the browser without inspecting it, leaving parsing and base64 decoding to the browser
• Payment first. Generation costs only occur after payment, so the structure prevents operating at a loss
• A cron job every 5 minutes picks up orders that are paid but not yet generated and automatically refunds them
• Completed data is auto-deleted after 90 days. Unpaid uploads are deleted after 24 hours

I wrote about the background and design decisions on X.
https://x.com/hima_tsukuru/status/2091847714355245341?s=20