Gas Estimation Tools

Why gas estimation exists as a problem

On Ethereum and similar EVM chains, every operation a transaction performs (storage writes, computation) costs "gas," and gas price fluctuates with network demand -- submit with too low a price and a transaction can sit unconfirmed for hours or get dropped; overpay and you've wasted real money for no benefit. Estimation tools predict the current fair price by looking at recent block gas prices and pending mempool activity, often offering a fast/standard/slow tradeoff.