# MEV on rollups: the sequencer sees your transaction first

URL: https://www.caijing188.com/mev-on-rollups/
Published: 2026-10-25T03:09:39+08:00 | Updated: 2026-10-27T22:09:52+08:00
Verified: 2026-10-27

## Quick answer
A single sequencer holds the ordering right, so a rollup swap is not a public mempool race but a private queue with an operator's policy attached. Ethereum.org's snapshot, as of October 2026, listed Base at $0.001 to $0.002 and Arbitrum One at $0.004 to $0.005 per transaction. Ask what mechanism backs a protection claim before trusting the label.

## Summary
On most rollups one operator decides where your transaction lands, and it reads the transaction before anyone else does. That removes the public bidding war and replaces it with a policy you cannot audit from outside. Ethereum.org's 1 to 6 October 2026 snapshot shows how cheap execution has become on Base and Arbitrum, which makes ordering rather than gas the scarce resource. Protection needs a mechanism: commit-reveal, encrypted submission, a published rule, or more than one party able to order.

## Key takeaways
- A single sequencer sees the transaction before it is public, so ordering is granted rather than auctioned
- Ethereum.org's 1 to 6 October 2026 snapshot put Base at $0.001 to $0.002 per transaction and Arbitrum One at $0.004 to $0.005
- FeeEdge's 17 August 2026 survey put entry-tier spot taker fees near 0.10%, far above an L2 execution fee
- MEV protection is a mechanism claim, so ask for the mechanism and not the slogan

## FAQ
Q: Is there less MEV on a rollup than on Ethereum?
A: The competition is lower and the concentration is higher. On Ethereum, searchers bid in a public mempool and the winner pays for priority. On a single-sequencer rollup, one operator sees the queue and decides the order, so extraction depends on its policy rather than on an auction, as of October 2026.
Q: Why does gas price not protect me on an L2?
A: Because execution is cheap enough that priority bidding is not the constraint. Ethereum.org's 1 to 6 October 2026 snapshot put Base at $0.001 to $0.002 and Arbitrum One at $0.004 to $0.005 per transaction. Ordering, not inclusion, is the scarce good, and ordering is not sold in the fee market.
Q: What would real MEV protection look like?
A: A mechanism you can name. Commit-reveal so the operator cannot read the trade before it orders it, encrypted submission with a delay, a published ordering rule applied to every transaction, or several independent parties able to order. A page that says protected without naming one of those is marketing.