Robinhood has moved its Ethereum layer-2 network into public testnet, opening the chain to outside developers for the first time. The retail brokerage confirmed the milestone this week, marking its most concrete step yet from trading app toward blockchain infrastructure operator.

The network, built with Arbitrum technology, is now accepting participation from developers ahead of a planned mainnet launch. Until now, testing had remained internal. The shift to a public testnet means anyone can deploy contracts, run nodes and stress-test the chain's throughput before real user funds are at stake.

Why is a brokerage running its own chain?

Robinhood built the layer-2 to settle tokenized assets closer to home. Instead of relying on Ethereum mainnet for every transaction, the company can process activity on its own network and post data back to Ethereum for security. That structure matters for a firm that has spent the past two years pushing into tokenization, from US stock tokens to stablecoin payments.

The operational logic is straightforward. A private-ish chain gives Robinhood predictable fees, compliance controls it can enforce at the sequencer level, and a settlement layer it doesn't have to share with the wider DeFi crowd. Public testnet is the point where that thesis meets outside scrutiny.

What does this change for developers?

Access, mainly. Public testnet removes the gatekeeping. Builders can now experiment with deploying on an environment that could, at mainnet, sit directly in front of Robinhood's massive retail user base. The brokerage has positioned the chain as a venue for tokenized real-world assets, and third-party teams now have a working surface to test that pitch against.

The choice of Arbitrum's stack also carries weight. It anchors the network to the most widely used optimistic rollup lineage in the industry, which lowers integration friction for teams already building on Arbitrum Orbit chains.

The bigger picture

Robinhood is not the first traditional finance firm to go this route, but its distribution is unusual. The company brings tens of millions of brokerage accounts to the table. If even a fraction of that base ends up touching tokenized assets settled on the new chain, the network's traffic profile would rival established layer-2s from day one.

There is regulatory context, too. The firm's tokenization push has proceeded under an increasingly permissive US environment for digital assets, and a company-operated settlement layer gives it a cleaner compliance perimeter than routing through public infrastructure it doesn't control.

What comes next

Public testnet typically runs for weeks or months before mainnet, depending on what breaks. The watch items now are throughput performance under external load, third-party deployment activity, and whether Robinhood publishes a formal mainnet timeline. Until then, the chain remains a proving ground, with real-money consequences deferred to launch.