Robinhood Chain

Network

Robinhood Chain is an Arbitrum Orbit (Nitro) rollup that settles to Ethereum. Gas is paid in ETH. Everything Photoswap does onchain happens here, and lib/chain.ts is the one place the facts live.

Chain id

4663

RPC

https://rpc.mainnet.chain.robinhood.com

Explorer

https://robinhoodchain.blockscout.com

Stack

Arbitrum Orbit, Nitro

Gas

ETH

Stablecoin

USDG (Global Dollar), 6 decimals

The registry

Robinhood publishes its tokenized stock list and prices on two keyless endpoints. lib/robinhood.ts reads both, filters to ASSET_STATUS_ACTIVE assets with a deployment on chain 4663, and joins them into TokenQuote objects. Assets are cached one hour, prices twenty seconds, and a stale cache is served rather than an error.

About 194 stocks and ETFs are live: AAPL, TSM, SKHY (SK Hynix), AVGO, QCOM, MU, NVDA, AMD, ASML, TSLA, AMZN, MSFT, GOOGL, META, COST, F, XOM and the rest. The registry name is cleaned of its Robinhood Token suffix before display.

Shares and the multiplier

Every stock is an 18-decimal ERC-20 that also implements ERC-8056, which adds a uiMultiplier. balanceOf returns raw units. The number of shares you actually hold is the raw balance times the multiplier, and the multiplier changes on corporate actions: a 4-for-1 split sets it to 4e18, which is exactly where CRWD sits today.

// shares = raw × uiMultiplier / 1e18 / 1e18
export function rawToShares(raw: bigint, multiplier: string | undefined | null): number {
  const m = parseMultiplier(multiplier);
  return (Number(raw) / 1e18) * (Number(m) / 1e18);
}

Impersonators

The explorer lists contracts named after real stocks that are not Robinhood's. Photoswap never resolves a stock by name from the explorer. Addresses come from the registry's deployments[].contractAddress for chain 4663 only, and the periphery addresses below are pinned in code.

RPC quirks

The public RPC answers JSON-RPC batches out of order. viem's default transport batches requests, which then mis-assigns results. publicClient is created with batch: false, and anything that needs many reads goes through Multicall3 instead, which is one call from the RPC's point of view.

export const publicClient = createPublicClient({
  chain: robinhoodChain,
  transport: http(ROBINHOOD_RPC, { timeout: 8_000, retryCount: 2, batch: false }),
});

Contracts

Uniswap v4 is where the stocks have liquidity; the v3 stock pools are empty. Pools use no hooks, and native ETH is currency 0x0, which sorts first. The fee tiers Photoswap probes, in order, are 5%, 1%, 0.3%, 0.05%, 0.01%. The 5% tier is the one stock pools use.