FAQ
What is Espresso?
What is Espresso?
Espresso is a global confirmation layer and shared sequencer for rollups. It leverages the HotShot BFT consensus so rollup transactions can be credibly confirmed within seconds, providing early, shared certainty before L1 finality.
Is Espresso live on mainnet?
Is Espresso live on mainnet?
Yes. Espresso is live as “Mainnet 0,” a production phase with a preregistered operator set and a roadmap toward broader proof-of-stake participation.
What wallets are supported?
What wallets are supported?
Wallets depend on the integrated rollup and release. Most Espresso-enabled rollups use Ethereum-compatible wallets (e.g., MetaMask); operator/integration flows may also interact with L1 contracts.
How are fees handled?
How are fees handled?
Builders deposit ETH into an L1 fee-token contract to pay HotShot data-processing fees; HotShot tracks working balances. Withdrawals are planned in a future release. Users otherwise pay gas on the chains they interact with.
How can I test or integrate a rollup with Espresso?
How can I test or integrate a rollup with Espresso?
Use the persistent Decaf testnet and the official integration guides in the docs. Start on testnet, then follow release-specific mainnet instructions as they evolve.