Prompt Caching with Claude: How I Cut Our Automation Bills by 70%

The first time a client of mine got their Anthropic invoice, they paid for it in panic. The automation was working — Claude was triaging support tickets against a 30-page knowledge base, accurately, around the clock — and the monthly bill had a comma in it that didn't used to be there. Most of that bill was a tax I didn't have to pay. I just hadn't turned on prompt caching yet. I run n8n in production for clients whose workflows lean on Claude for the reasoning step — lead enrichment, document e