Every tool
Read live from public nodes when you load the page. Fees move constantly, so treat this as the cost right now rather than what you will pay in an hour.
Two numbers multiplied together
Every transaction costs gas units times a gas price. The units depend on what you are doing and barely change: sending ETH is always 21,000, a swap is usually somewhere north of 150,000 because it touches more contracts. The price per unit is what swings, and it swings with how busy the chain is.
That is the whole reason layer 2 networks exist. Base and Arbitrum run the same transactions and post compressed proof back to Ethereum, so they split one expensive settlement across thousands of users. Same swap, same wallet, a fraction of the cost.
Fees are paid in the chain’s own token, so you need a little of it before you can move anything else. A wallet full of tokens and no ETH cannot do anything at all, which surprises people at the worst time.
Common questions
Why is Base so much cheaper than Ethereum?
Because it batches thousands of transactions and settles them on Ethereum together. You pay your share of one settlement instead of the whole thing. That is what a layer 2 is.
The numbers are not loading
The tool reads public nodes directly from your browser, so a blocked connection, an ad blocker or a rate limited node will stop it. Nothing is wrong with your wallet.
What is gwei?
A billionth of an ETH. Gas prices are quoted in it because the numbers are friendlier than writing 0.000000015 ETH every time.
Want a hand using these on your own position?
We go through it together on a call. Your holdings, your risk, your setup. You click everything and we never ask for keys.