Ethereum
What Arbitrum is and how its rollup cuts Ethereum fees
Arbitrum bundles hundreds of Ethereum transactions into one cheap batch and settles back on Ethereum. How the optimistic rollup works, what ARB governs, and how to bridge.
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Arbitrum
Crypto Cards
Fiat24 card review: how it works and why it left China
Fiat24's card runs through a Swiss-licensed issuer on Arbitrum and stopped taking mainland China users on June 5, 2026. Its zero fees were paid for by Mastercard volume targets rather than user fees.