# Arbitrum Orbit Chains: Rollups and L3s Built on Arbitrum

> A sortable list of Arbitrum Orbit chains: where each settles, rollup or AnyTrust, gas token, BoLD and ordering, license fees and daily activity, read on-chain.

Markdown copy of https://voltfincrypto.com/apps/arbitrum-orbit-chains

**Question:** Which chains are built with Arbitrum's Orbit stack, where do they settle and how do they compare?

- Kind: Table in Voltfin Strata
- Topic: [Layer 2s](https://voltfincrypto.com/topics/layer-2)
- Chains: Multi-chain, Arbitrum, Ethereum, Robinhood Chain
- Status: Planned. The data is not published yet, so this page states no figure; each figure will open its receipt when it is.

Arbitrum Orbit is the framework for launching Arbitrum chains: any team can run its own chain with the Nitro software behind Arbitrum One. A chain can settle to Ethereum as a layer 2 or to Arbitrum One, Arbitrum Nova or another chain as a layer 3. It can run as a rollup that posts all its data or as an AnyTrust chain whose data a committee holds, and it can charge gas in ETH or in its own token.

This table lists each Arbitrum chain once with those choices and the facts that change how it should be read: whether it runs the BoLD dispute protocol, how it orders transactions and whether it owes the Arbitrum Expansion Program's license fee to the Arbitrum DAO. Activity columns give its daily transactions, active addresses and fees on shared definitions.

Rows are built from each chain's own contracts: the rollup contract on its settlement chain, its sequencer inbox and its bridge. Arbitrum One and Arbitrum Nova are listed too, as the chains many layer 3s settle on.

## Blueprint

One row: One row per Arbitrum chain, on the latest complete day

- **Chain** (`chain`): The chain's name, linked to its registry entry or its own documentation.
- **Chain ID** (`chain_id`): The EVM chain ID the chain uses for transactions.
- **Settles to** (`settles_to`): The chain this one settles to: Ethereum, Arbitrum One, Arbitrum Nova or another chain.
- **Data mode** (`data_mode`): Rollup, posting all data to the settlement chain, or AnyTrust, posting a committee certificate.
- **Gas token** (`gas_token`): The token the chain charges gas in: ETH or its own token.
- **BoLD** (`bold`): Whether the chain runs the BoLD dispute protocol and whether validation is open to anyone.
- **Transaction ordering** (`ordering`): First come first served, priority fees or an auction, from the sequencer's configuration.
- **License fees, 90 days** (`license_fees_90d`, ETH): Payments to the Arbitrum DAO under the Arbitrum Expansion Program over the last 90 days, where the chain owes them.
- **Transactions per day** (`transactions_per_day`): Average daily transactions over the last 30 days, leaving out ArbOS internal transactions.
- **Active addresses** (`active_addresses`): Average daily addresses that sent a transaction over the last 30 days.
- **Fees, 30 days** (`fees_30d`, ETH): Fees users paid over the last 30 days, in ETH terms where a price for the gas token is on record.
- **Receipt** (`receipt`): The blocks and reads behind the row.

## How it will be measured

- Each chain's settlement layer, data mode and gas token are read from its rollup and bridge contracts on the chain it settles to, with AnyTrust chains identified by their data availability committee keyset.
- BoLD is identified from the chain's rollup contract version and validator settings; transaction ordering from the sequencer's published configuration and any auction contract on the chain.
- License fees are read as transfers from each chain's fee recipients to the Arbitrum DAO under the Arbitrum Expansion Program, which applies to chains that settle outside Arbitrum One and Nova.
- Activity is counted per UTC day from each chain's blocks, leaving out ArbOS internal transactions, on the same definitions for every chain.
- Every row names the block on each chain it was read at.

## Data it needs

- `l2_activity_daily` (to build): Per layer 2 per day: transactions, active addresses, fees users paid on the L2, and what the L2 paid Ethereum to settle and post data.
- `chain_activity_daily` (to build): Transactions, active sending addresses, new addresses, contracts created and gas used on each chain per day, counted from blocks and transactions.
- `protocol_revenue_daily` (to build): Fees users paid to each protocol and the part kept by the protocol or its token holders, per protocol and day, including buybacks.
- Source: Rollup, bridge and sequencer inbox contracts of each Arbitrum chain on its settlement chain
- Source: Data availability committee keysets of AnyTrust chains
- Source: Transfers from each chain's fee recipients to the Arbitrum DAO under the Arbitrum Expansion Program
- Source: Each chain's blocks and receipts for transactions, active addresses and fees
- Source: A registry of Arbitrum chains with chain IDs and settlement layers, each with its source

## Questions

### What is an Arbitrum Orbit chain?

A chain launched with Arbitrum's Nitro software under its own operator. It can be a layer 2 settling to Ethereum or a layer 3 settling to Arbitrum One, Nova or another chain, and it can choose its gas token, its data mode and its validators.

### What is the difference between a rollup and an AnyTrust chain?

A rollup posts all its transaction data to its settlement chain, so anyone can rebuild its state. An AnyTrust chain gives its data to a committee and posts only a certificate, which is cheaper but relies on enough committee members to make the data available.

### What is the Arbitrum Expansion Program?

The license under which the Arbitrum DAO lets chains use Nitro while settling somewhere other than Arbitrum One and Nova. Those chains pay a share of their net revenue to the DAO and a developer guild, and the table reads those payments as transactions.

### What is an L3?

A chain that settles to a layer 2 rather than to Ethereum directly. Many Arbitrum chains are layer 3s on Arbitrum One, which in turn settles to Ethereum, so their security depends on both.

### Is Robinhood Chain built on Arbitrum?

Robinhood announced in 2025 that Robinhood Chain is built on Arbitrum technology. The table lists it with its current status, testnet or mainnet, and reads its contracts on the chain it settles to once they are public.

## Glossary

- **Nitro**: The software that runs Arbitrum One and every Arbitrum chain: a modified Ethereum client with ArbOS on top.
- **AnyTrust**: An Arbitrum chain mode in which a data availability committee holds transaction data and the chain posts only certificates.
- **Layer 3**: A chain that settles to a layer 2 instead of to Ethereum directly.
- **Data availability committee**: The group of members that store an AnyTrust chain's data and sign certificates that they hold it.

## Related apps

- [Arbitrum One Stats: Gas, Activity, Timeboost and Priority Fees](https://voltfincrypto.com/apps/arbitrum-one-stats)
- [OP Stack Chains: The Superchain List Compared](https://voltfincrypto.com/apps/op-stack-superchain-chains)
- [Ethereum Layer 2 List Ranked by Activity, Fees and Value](https://voltfincrypto.com/apps/ethereum-layer-2-list)
- [Rollup Decentralization: Upgrade Keys and Exit Windows](https://voltfincrypto.com/apps/rollup-decentralization)
- [Ethereum TPS: Mainnet and Layer 2 Transactions per Second](https://voltfincrypto.com/apps/ethereum-tps)
- [Ethereum L2 Fees Compared: Cost per Transaction](https://voltfincrypto.com/apps/ethereum-l2-fees)

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