You ever get hit with gas fees on a failed transaction? Yeah, happens to the best of us in DeFi. One moment you're trying to execute a swap, next thing—transaction tanks, your capital's locked up, and boom, gas fees gone. Money vanished into the blockchain void for absolutely nothing.

It's brutal, honestly. That's exactly the kind of friction that makes you think twice about trading on decentralized exchanges. Every failed attempt costs real money, whether the transaction goes through or not.

This is where transaction simulation tools come in handy. Instead of sending your trade blind and hoping it lands, you can preview whether it'll actually succeed before broadcasting anything onchain. Catches the problems early—slippage issues, insufficient liquidity, smart contract reverts, all of it. You see the red flags before losing gas fees and capital to them.

Smarter DeFi users are already running checks like this. It's the difference between learning the hard way and keeping your money safe.