What’s actually driving the numbersThe single clearest catalyst in recent months has been ether.fi’s migration of its non-custodial crypto card product onto OP Mainnet, completed between February and April 2026. By Q4 2024, average transaction costs on OP Mainnet had fallen to $0.03, a direct consequence of EIP-4844’s blob data availability upgrade that reduced the cost of posting transaction data to Ethereum’s base layer. This matters because it moves OP Mainnet closer to the “Stage 1” decentralization benchmark that researchers like L2Beat use to evaluate rollup maturity. What this means for the OP Stack ecosystemOP Mainnet does not exist in isolation. It anchors the OP Stack, a shared codebase that powers a growing number of chains including Base, which Coinbase launched in 2023.