The Superbridge is a user friendly interface over the native bridging contracts for various rollup ecosystems, a kind of bridge aggregation layer where users are able to enter into ecosystems they're interested in.
The Superbridge recently went live with support for Arbitrum Nitro powered chains - Arbitrum One and Arbitrum Nova to start, with more L2's and L3's launching soon.
With the Arbitrum Nitro launch we teamed up with Conduit (https://conduit.xyz) to give all testnet and devnet deployments a free instance of the Superbridge. The Superbridge instance can be launched from within the Conduit interface and requires no approval from our side.
In addition to ETH and ERC20 token bridging, chains powered by Arbitrum Nitro have access to easy mode withdrawals. Easy mode withdrawals allow us (Superbridge operators) to handle relaying the withdrawal transactions on the base chain after the seven day fraud proof period has elapsed. This is a major UX win because users only need to send one transaction instead of the usual two.
Superbridge History
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applied to the Arbitrum Citizens Retrofunding Round 1 1 year ago which was rejected