Lab — Web3 tools
Gas Fee Dashboard is a free online tool that shows slow, standard and fast gas prices across six blockchains, with a congestion meter and estimated transfer and swap costs in dollars — using clearly labelled demo data, so you can learn how gas markets work without connecting a wallet or spending anything.
Gas prices by chain (gwei)
Cost estimator — Ethereum
Cheapest swap right now (standard tier)
Every blockchain transaction pays for computation in units called gas. The gas price — usually quoted in gwei, a billionth of the native token — is what you pay per unit, so total fee = gas used × gas price. Since the London upgrade, Ethereum-style chains split the price into a base fee set by the network and a priority fee (tip) you add to jump the queue. Layer-2 chains batch many transactions together, which is why their gas prices look tiny next to Ethereum's. The numbers on this page are fixed demo values with a small simulated random walk — they illustrate the mechanics, not today's market.