I code on Claude's pay as you go API and started budgeting my token usage with my own CLI wrapper.
Basically I set a budget for a task that I'm working on in my project:
Task: "Fix mobile responsiveness" Budget: $3.00
and the budget updates after each prompt:
Task: "Fix mobile responsiveness" Budget: $2.34 / $3.00 78%
It helps keep an eye on my spending when working on projects.