zkSync Era Gas Tracker

zkSync Era is a ZK rollup built by Matter Labs: every batch of transactions gets a validity proof verified on Ethereum, so there's no week-long fraud-proof challenge window to wait out. Unlike zkEVMs that replicate Ethereum's bytecode line for line, zkSync Era compiles Solidity and Vyper contracts through its own zksolc/zkvyper toolchain into a custom zkEVM bytecode — often described as a "Type 4" zkEVM. Contracts behave the same way to users, but gas accounting is rebuilt from the compiler up rather than mirroring Ethereum's opcode costs exactly. Gas is still paid in ETH, the same asset used on Ethereum mainnet.

A zkSync Era transaction fee bundles two things into the single gas price you're quoted, rather than showing them as separate line items the way OP Stack chains do: execution gas for running your transaction, and pubdata gas for your share of publishing the batch's state changes to Ethereum. Since zkSync moved that data to EIP-4844 blobs, pubdata cost reflects compressed state diffs — only what actually changed in storage — rather than raw calldata, which usually works out cheaper than posting a full transaction record.

zkSync Era also has native account abstraction built into the protocol itself: every account, not just optional smart-contract wallets, can route through a paymaster. That's how some dApps let you pay a fee in USDC or another token, or sponsor it outright — the underlying gas is still ETH, a paymaster is just swapping it out on your behalf.

zkSync Era's own execution cost is usually a rounding error; what changes your quote traces back to Ethereum's blob market or to unusually heavy storage writes.

• Ethereum blob market demand — Pubdata is posted as EIP-4844 blobs, priced off Ethereum's live blob base fee. A busy stretch on mainnet raises the data cost for zkSync Era, and every other rollup, regardless of zkSync's own traffic.
• How much storage a transaction touches — Pubdata gas scales with the size of the compressed state diff, not with raw gas used — a swap that writes to many storage slots costs more to publish than one with similar gas but fewer state changes.
• Sequencer and prover throughput — Matter Labs operates zkSync Era's sequencer and prover. Spare capacity keeps execution gas low most of the time, though sustained high demand can push it up.
• Paymaster subsidies — When a dApp's paymaster covers or discounts your fee, the price you see reflects that arrangement, not the network's underlying gas price.

Most zkSync Era confusion comes from name collisions with an older product and expectations carried over from other rollups.

• zkSync Era vs. zkSync Lite — zkSync Lite (zkSync 1.0) is an older, separate payments-only rollup from the same team, with its own bridge and network. Selecting "zkSync" instead of "zkSync Era" when withdrawing from an exchange sends funds to the wrong chain.
• No ZK token needed for gas — Every zkSync Era transaction fee is paid in ETH by default. ZK is zkSync's governance token, launched in 2024 — you don't need to hold it to transact.
• Withdrawals aren't instant — zkSync Era's canonical bridge takes roughly a day to finalize, even though the validity proof itself settles faster — that's a built-in security delay, not proof time. Third-party bridges can be quicker for a fee.
• Gas estimates can differ from a mainnet simulation — Because contracts run as compiled zkEVM bytecode rather than raw EVM opcodes, a dApp that estimates gas by simulating against Ethereum can be off. Use zkSync Era's own eth_estimateGas instead.