Optimism is an Ethereum Layer 2 optimistic rollup and the origin of the OP Stack, the open framework that powers a whole family of L2 networks. It delivers low fees and fast blocks secured by Ethereum.
Optimistic Rollup (OP Stack). Settlement on U.CASH is non-custodial: every payment moves on-chain, direct to a wallet you control. Confirmation policy for Optimism: Credited after a few L2 confirmations, typically under a minute; settles to Ethereum L1..
A single U.CASH account works across accept, swap, and buy. Pick where to start.
Take ETH in checkout alongside cards and 30+ chains. White-label, non-custodial, live in minutes.
Trade ETH for any asset across the network, routed for the best price.
Get ETH with any asset you hold, one step, settled to your wallet.
Receive, hold, and settle ETH your way.
The leading smart-contract blockchain and home of ERC-20.
Ethereum L2 built on the OP Stack.
Leading Ethereum L2 by activity.
EVM sidechain built for fast, cheap payments.
The original proof-of-work blockchain and largest cryptocurrency.
High-throughput EVM chain for consumer apps.
One account unlocks accept, swap, buy, and the rest of the U.CASH network across 30+ chains.