Hi everyone! I'm Felipe, a developer who kept watching my Claude API bill climb every month hit $340 and decided to actually fix it instead of just accepting it.
I spent a few weeks auditing every API call and found the same 3 patterns eating 75%+ of my costs: no prompt caching, wrong model selection, and paying for silence on non-streaming calls.
Most devs overpay for Claude API by 3-16x. RPG Materia teaches you to fix that — through 5 gamified missions, real code, and a GRIM owl who judges your choices.
• M1: Token audit (where your money actually goes)
• M2: Prompt caching (90% off repeated context)
• M3: Model routing (Haiku is 12x cheaper)
• M4: Output control (stop paying for silence)
• M5: Batch API (async = 50% off)
Free to play. Pay what you want. Certificate included.
