As of January 2025, Optimism, Arbitrum One & Base are supported in Trezor Suite under the “Experimental Features” section.
Optimism, Arbitrum One & Base are Layer 2 solutions which run on top of Ethereum.
Layer 2 solutions allow transactions to be faster and cheaper while realizing the benefits of Ethereum’s security. For more information about Layer 2 solutions, why you should use them and how they work, please read our article called What is Layer 2?
Optimism, Arbitrum One & Base are based on Optimistic rollups - Layer 2 scaling solutions that process transactions off-chain and post summarized results to the main blockchain, reducing congestion and lowering fees. They rely on an “optimistic” assumption that transactions are valid unless challenged, with security ensured through fraud proofs on the Layer 1 network.
In order to use these blockchains in Trezor Suite, you will need to enable experimental features in Trezor Suite.
You can do this by heading to Settings ⇒ Application, scrolling down to the “Experimental” section and then toggling the button next to “Experimental Features.”
Once enabled, you will be able to add each network to Trezor Suite, just like you would add any other EVM compatible blockchain like Polygon or BNB Smart Chain.
Layer 2 EVMs rely on ETH as their primary system token but feature faster block times and significantly lower transaction fees compared to the Ethereum mainnet.
For example, to make a transaction on Optimism, users must have ETH on the Optimism network to cover the fees. While Optimism and Arbitrum One also have their own tokens, these are standard ERC-20 tokens, not system tokens. Base, on the other hand, does not currently have its own native token.