OpenChainBench
Full benchmark: Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more
BlockchainsArbitrum One

Arbitrum One block time

As of August 1, 2026, Arbitrum One block time is 325 ms at the median (p50, 24h window), with 465 ms at p90 and 497 ms at p99. Arbitrum One ranks #2 of 10 chains measured on this benchmark.

Arbitrum One block time is 325 ms (p50, 24h). Arbitrum Nitro defaults to a 250 ms sequencer interval, by far the most aggressive cadence in the L2 cohort, made possible because the Nitro stack decouples block production from L1 anchoring and runs a single Offchain Labs sequencer that posts batches to Ethereum asynchronously. Measured by holding an `eth_subscribe("newHeads")` WebSocket on the public Arbitrum RPC and recording wall-clock deltas between consecutive head events.

How Arbitrum One compares

Live p50 over the last 24 hours across every chain on this benchmark, ranked lowest first.

  1. #1Robinhood Chain78 ms
  2. #2Arbitrum One325 ms
  3. #3Mantle1.78 s
  4. #4Base1.93 s
  5. #5Optimism1.95 s
  6. #6Taiko1.98 s
  7. #7Blast1.98 s
  8. #8zkSync Era2.47 s
  9. #9Scroll4.99 s
  10. #10Linea5.82 s

Methodology, charts and the full ledger live on the Fastest L2 block time, live across Robinhood, Arbitrum, Base and 7 more page. Raw data: JSON endpoint.