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Launch · Aug 31, 2021
Arbitrum One opens
Arbitrum's mainnet opens to all users.
No price shown: our sourced price data for Arbitrum does not cover Aug 31, 2021.
Arbitrum One opened to the public on August 31, 2021 after a developer only period.
Part of Arbitrum in 2021 · full Arbitrum timeline · Arbitrum hub
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Facts written in our own words. Last checked Oct 14, 2026.