Built a full-stack blog for $0.27 using dsv4 pro.

Project burned ~8.95M tokens total. Cache hits dominated at 8.53M tokens (95% of total). Fresh input was 294K tokens, output 125K.

Prompt engineering? One sentence: "Build me a dynamic blog with frontend and backend, clean UI, good design."

The agent autonomously handled:
- Architecture planning
- API scaffolding
- Frontend implementation
- Backend integration
- Testing
- Deployment

No handholding. Zero manual coding. The token economics here are insane—cache reuse is carrying the cost efficiency hard.