7 posts.
Ronin became an OP Stack layer 2 in May 2026. Measured: 2 s blocks, a fixed 20 gwei base fee, a 200-block getLogs cap, ~23 min to finalized, and no pre-migration history.
Read →opBNB is an OP Stack L2 settling to BNB Smart Chain, with 250 ms blocks. Measured finality, fees, the 50,000-block getLogs cap and a stale-finality trap.
Read →Katana (chain ID 747474) is an OP Stack L2 with ZK proofs and 1-second blocks. Measured finality, fees, getLogs limits, archive access and code.
Read →Optimism (chain ID 10) is both a mature optimistic rollup — 2-second blocks, ETH gas, fault proofs live since 2024 — and the origin of the OP Stack, the codebase behind Base, Zora, opBNB, Unichain, and Soneium. The developer map: what the two-layer fee model means for gas estimation, why traces are uneven there, and how everything you learn on OP Mainnet carries across the family.
Read →Fraxtal is Frax Finance's OP Stack L2 (chain ID 252) with two twists most Superchain L2s don't have: gas is paid in FRAX, not ETH, and its Flox system pays contract developers FXTL points for the gas their users spend. It's standard EVM (viem/ethers/foundry work), with ~2s blocks and the usual ~7-day OP Stack withdrawal window. Here's the developer map.
Read →Celo became an OP Stack L2 in March 2025 (with EigenDA), keeping chain ID 42220. It's standard EVM, so viem/ethers work — but it has a feature almost no other chain does: pay transaction fees in stablecoins like cUSD, not just the native token. Here's the developer map, including fee currencies and the L1→L2 shift.
Read →Unichain is Uniswap's own L2 — an OP Stack rollup on the Optimism Superchain, purpose-built for DeFi with ~1s blocks. It speaks standard eth_* JSON-RPC, so viem and ethers just work. Here's the chain ID, what carries over from Ethereum, and the Superchain and finality details that actually matter.
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