Chain parameters

Reference of key system parameters for Arbitrum One and Arbitrum Nova, including chain IDs, block times, gas settings, and confirmation thresholds.

Parameter	Description	Arbitrum One	Arbitrum Nova	Arbitrum Sepolia
Dispute window	Period in which a can challenge an before the assertion is confirmed	45818 blocks (about 6.4 days)	45818 blocks (about 6.4 days)	20 blocks (about 4.0 minutes)
Minimum bond amount	Funds that a proposer must bond to propose an assertion on the	3600 ETH	1 ETH	1 Sepolia ETH
Force-include period	Time after which a delayed message can enter the inbox without the	7200 blocks / 24 hours	7200 blocks / 24 hours	5760 blocks / 24 hours
Gas target	Gas per second above which the congestion mechanism starts	See child chain gas fees	See child chain gas fees	See child chain gas fees
Gas price floor	Minimum gas price	0.02 gwei	0.02 gwei	0.2 gwei
Block gas limit	Maximum total gas that the transactions in one block can use	32,000,000	32,000,000	32,000,000

Current gas targets

Arbitrum Nova uses a single gas target of 7,000,000 gas/s (7 Mgas/s) and no adjustment windows.

For more about the gas target, see Gas and fees deep dive.

To configure the gas target for your Arbitrum chain, see Dynamic pricing for Arbitrum chains. To calculate the values, see How to calculate the values for your chain.