In Web2, failed requests are free. You misconfigure a Stripe call, Stripe says 400 Bad Request , you fix it, you try again. No charge. The server rejected your request before doing any real work, or if it did do work, the rollback is Stripe's problem, not yours. I assumed Solana worked the same way. It doesn't. And I found out the expensive way , well, "expensive" in a devnet sense, but the lesson transferred. The day I broke things on purpose On Day 19 of #100DaysOfSolana, the challenge was to deliberately trigger failed transactions and inspect them. Not handle them gracefully. Break them intentionally , on purpose, and then read the wreckage.…