how it works

swaps go in. 1% stays. stocks come out.

$POP trades against ETH in one Uniswap v4 pool on Robinhood Chain. A hook, the cap, takes 2% of every swap inside the pool, buys and sells alike. The crate is the holders' pool of ETH: anyone can pour ETH into it. The crate credits that ETH to every holder in proportion to their $POP balance. Each holder picks a ticker. When they pop, their accrued ETH is swapped into that stock token and sent to their wallet.

the cap

The cap is a Uniswap v4 hook attached to the single POP/ETH pool. It uses four permissions and nothing else: beforeSwap, afterSwap, and the two return-delta flags that let it change the swap amounts.

• The cut is a constant: 2% buy / 2% sell. No schedule, no setter, no owner.
• The fee is always taken in ETH. When ETH is the input, it is taken before the swap and the pool sees 99%. When ETH is the output, it is taken after the swap from what comes out.
• Exact-output swaps revert for now. Every router uses exact-input by default, so this does not affect normal trading.
• The cut is taken on the output leg (POP on a buy, ETH on a sell) and paid inside the swap to a fixed wallet. The hook never holds a token.
• There is no seal flag: before the launch the pool simply does not exist. Creating it records launchedAt.
• The hook only serves its registered pool. Any other pool key reverts.

// beforeSwap, ETH in
uint256 cut = swapAmount * taxBps / 10_000; // taxBps: 200 (buy) / 200 (sell)
poolManager.take(ETH, address(crate), fee);
// the pool swaps the remaining 99%

the crate

The crate is a dividend contract paid in ETH and withdrawn as stock. It uses the magnified-dividend-per-share pattern: one global ethPerShare counter goes up every time fees arrive, and each holder keeps a correction so transfers never move accrued fizz.

• fizzOf(holder) is your accrued ETH, not yet popped.
• setFlavor(tickerId) picks your ticker. Free, instant, changeable any time. New holders default to the first ticker on the shelf.
• pop(minOut) swaps your fizz into your flavor and sends the stock token to you. minOut comes from a quote made right before you send.
• popFor(holders, minOuts) lets anyone pop on behalf of others. It always pays the holder, never the caller.
• Ticker 0 is ETH. If a stock route is paused, or you choose ETH, a pop pays plain ETH.
• If a swap fails, the pop reverts and your fizz stays where it was. Fizz is never lost.
• Excluded from fizz, set once at deploy: the PoolManager, the cap, the crate, and the burn address.

ethPerShare += msg.value * MAGNITUDE / eligibleSupply;
fizz = (balance * ethPerShare + correction) / MAGNITUDE - withdrawn;

the shelf

The shelf is the list of tickers you can pick. Each entry has an id, a symbol, the stock token address, and a route contract that knows how to turn ETH into that token.

• Maximum eight tickers.
• A ticker can be paused. Holders on a paused ticker are paid in ETH when they pop. Tickers are never deleted.
• Each route is an adapter. Today they are all Uniswap v4 routes: NVDA has a direct ETH pool, the others go ETH to USDG to stock.
• Stock tokens on Robinhood Chain are standard ERC-20s with 18 decimals and a uiMultiplier that adjusts for splits and dividends. Your raw balance never changes.

Launch shelf, pending sign-off:

contracts and addresses

Chain: Robinhood Chain, id 4663, an Arbitrum Orbit L2 that settles to Ethereum. Public RPC https://rpc.mainnet.chain.robinhood.com. Explorer robinhoodchain.blockscout.com.

Protocol contracts are listed in the footer of the landing page once deployed. Until then the site is sealed.

Verified third-party addresses:

A token with a matching ticker but a different address is not a Robinhood stock token.

risks

• Stock tokens are not shares. They may not be available in every jurisdiction and are not available to US persons.
• Smart contracts can fail. The hook, the crate and the routes are new code. Fork tests against Robinhood Chain and an external review are planned before mainnet.
• Routes depend on third-party liquidity. If a pool is thin, a pop can get a bad price. Your slippage setting is the guard. If a pool disappears, the ticker is paused and pops pay ETH.
• Off-hours prices in stock token pools can drift from the market. Pools trade around the clock.
• The token, the crate and the cap have no owner. The shelf keeper (add or pause a ticker) is a single EOA during the proof of concept.
• Nothing here is investment advice.