Arbitrum

Arbitrum is the stack Robinhood Chain stands on and, unusually, a party that gets paid when the chain does well. Technically, Robinhood Chain is a dedicated Arbitrum chain — built on the Arbitrum stack (Orbit / Dedicated Chains, Nitro) and settling to Ethereum — which is what gives it Ethereum-grade settlement security, familiar EVM tooling and ~100ms blocks without Robinhood having to design a base layer from scratch. That choice is the quiet explanation for a lot of the chain's properties: the developer experience, the settlement model and the data-availability approach are inherited, not invented. The more interesting relationship is economic. Under the Arbitrum Expansion Program, any chain built with the Arbitrum stack that settles outside Arbitrum One routes 10% of its net protocol revenue back to the Arbitrum ecosystem — reported as 8% to the Arbitrum DAO treasury (controlled by ARB holders) and 2% to the Arbitrum Developer Guild. So Arbitrum is not merely a vendor; it is a revenue counterparty whose token holders have a direct claim on a slice of Robinhood Chain's economics, which is why ARB reacted to the chain's early volume. The position to take is that this is a genuinely aligned, and genuinely dependent, arrangement: Robinhood gets a battle-tested stack and Arbitrum gets a marquee revenue stream, but it also means Robinhood Chain's fortunes and Arbitrum's are now partly linked, and the 'net revenue' base of that 10% — after costs, on a chain still running launch subsidies — is the number that determines whether the revenue share is material or nominal in practice.

The stack

Robinhood Chain is a dedicated Arbitrum chain built on the Arbitrum stack (Orbit / Dedicated Chains, Nitro), settling to Ethereum.· 90%§

Expansion Program revenue share

Under the Arbitrum Expansion Program the chain routes 10% of net protocol revenue to the Arbitrum ecosystem.· 88%§

Revenue split

Of that 10%, a reported 8% goes to the Arbitrum DAO treasury and 2% to the Arbitrum Developer Guild.· 82%§

Inherited properties

The chain's EVM tooling, ~100ms blocks and Ethereum settlement are properties of the Arbitrum stack rather than bespoke design.· 82%§

Market effect

ARB reacted to Robinhood Chain's early volume given its direct revenue claim on the chain.· 72%§

• 2026-07-01

  Robinhood Chain mainnet launches on the Arbitrum stack

  Arbitrum confirmed Robinhood Chain as a dedicated Arbitrum chain settling to Ethereum, live at mainnet launch.

• 2026-07-01

  Expansion Program revenue share applies to Robinhood Chain

  Under the Arbitrum Expansion Program, Robinhood Chain routes 10% of net protocol revenue to the Arbitrum ecosystem (8% DAO, 2% Developer Guild).