How to Bridge to Robinhood Chain

Bridging to Robinhood Chain means moving assets between Ethereum and the L2 over the Arbitrum canonical bridge, a trustless L1↔L2 route with no third-party validators, or over a partner route that is faster and trusts something else. Deposits usually land in about ten minutes. Withdrawals take roughly seven days. Everything below comes from Robinhood’s bridging docs, checked 17 Aug 2026.

Koi did not build the chain or the bridge. These are notes on how the thing works, written by people who have run contracts on an L2 — see Koi for who that is. Ready to transfer? Bridge to Robinhood Chain with Koi. The canonical Ethereum route stays on the official Arbitrum portal.

Before you bridge

The wallet has to already know the network, or the L2 side of the transfer is invisible to you. Add Robinhood Chain to the wallet first — chain ID 4663, gas in ETH. Background on the chain itself: Robinhood Chain.

Open the bridge from the official docs rather than from a link in a reply. Bridge phishing is the most profitable scam on any new chain, and the fake interface always looks correct.

Ethereum → Robinhood Chain

The canonical deposit uses Arbitrum retryable tickets: one transaction on Ethereum creates a ticket that is redeemed on L2.

1. Connect the wallet to the canonical bridge, with Ethereum as the source network.
2. Pick the asset and amount. An ERC-20 needs a one-time approval before the deposit itself.
3. Confirm the L1 transaction and pay Ethereum gas.
4. Wait. Deposits typically complete in about ten minutes.
5. Check the balance on Robinhood Chain — the block explorer shows the L2 side.

If the L2 leg fails, most often because the ticket was under-funded on gas, the funds are not lost. The deposit can be manually redeemed from the bridge interface within 7 days. Do not send a second deposit to fix the first one.

Robinhood Chain → Ethereum

Withdrawals are the standard three-step Arbitrum flow, and the middle step is the one people forget.

1. Initiate the withdrawal on L2.
2. Wait out the challenge period — roughly 7 days, the window in which Arbitrum fraud proofs can be raised.
3. Come back and claim on Ethereum L1. The claim is its own transaction and needs L1 gas.

Nothing arrives on Ethereum until you claim it. Keep enough ETH on L1 to pay for that claim before you start, and do not plan a withdrawal around a deadline seven days out.

Routes, and what each one trusts

Faster almost always means a different trust model than the canonical bridge. An intent filled in three seconds is a relayer taking on the risk for a fee; an OFT transfer depends on a messaging protocol rather than on Ethereum. That trade can be entirely reasonable for a small transfer you want now. It is a different bet from the canonical route, and appearing on an official partner table is not an audit.

Other ways to fund Robinhood Chain

Card and bank funding buy USDC on Base through Coinbase, Stripe, and Bridge.xyz — those providers run their own identity checks — then you sign a second hop onto Robinhood Chain. An exchange or wallet can send to a third-party deposit address. Solana can be a source (USDC, USDG, SOL); SOL arrives as ETH for gas. Circle USDC arrives as Paxos USDG. Those rails live on Koi’s inbound interface, not on the canonical portal.

For developers

Programmatic deposits go through the Delayed Inbox on Ethereum L1, the same as any Arbitrum chain. The L2 address of an ERC-20 is not its L1 address, so read addresses from the Protocol Contracts reference in Robinhood’s chain docs and confirm them on the explorer. Never take a token address from a screenshot, a bot, or this page.

What tends to go wrong

• Bridging, then discovering the wallet never had the network added, and assuming the funds vanished.
• Initiating a withdrawal and never claiming it on L1.
• Spending all L1 ETH on the withdrawal’s first step, leaving nothing for the claim.
• Sending assets to a bridge contract directly instead of using the interface.
• Using a “bridge” that asks for an unlimited approval on a token it does not need to touch.

Once assets are on the chain, what you can do with them is a separate question — most of the visible activity is around tokenized stocks and real-world assets, none of which changes how the bridge behaves.

Sources

• Bridging
• Connecting to Robinhood Chain
• About Robinhood Chain

Questions