I switched my Claude API base URL and stopped paying $20/month

I switched my Claude API base URL and stopped paying $20/month This is the story of a single environment variable that saved me $216/year. export ANTHROPIC_BASE_URL = That's it. One line. Claude Code works exactly the same. The rate limit errors stopped. My bill dropped from $20/month to $2/month. Here's what happened and why it works. The problem with paying Anthropic directly I was a Claude Pro r at $20/month. For occasional use, that's fine. But when I started using Claude Code for real work - refactoring, test generation, code review - I started hitting the rate limit wall constantly.