Docs

The chain

Fountain Liquidity runs entirely on Robinhood Chain, an Arbitrum-stack L2 with chain id 4663. ETH is the gas token. USDG, the Paxos Global Dollar, is the dollar leg and lives at 0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168 with 6 decimals. Robinhood issues tokenized US equities and ETFs on it as ordinary ERC-20s, which is why a share of AAPL can sit in the same wallet as a memecoin.

Bridge in from Ethereum, Arbitrum or Base through the official bridge. Every transaction this app makes is public on Blockscout.

What holds your money

Two different models run side by side, and the difference matters:

• Swap and Earn are non-custodial. You approve, you sign, tokens move between your address and a protocol. We never touch them and cannot freeze or move them.
• Vaults, perps and community pools use a treasury wallet at 0x6855e22eF5F31b12e4d50640cc8528cc6828fe42. Deposits are verified on-chain before they are credited and payouts are signed from it. Balances settle off-chain so they can update instantly, but every movement in and out is a real transaction you can look up.

Swap

Quotes come from the 0x Swap API first and LI.FI as a fallback. The route, the minimum you will receive and the price impact are shown before you sign. An ERC-20 sell needs one approval transaction first; selling native ETH does not. Slippage defaults to 0.5% and quotes expire after about 30 seconds, after which the app re-quotes on its own.

Earn

Each venue is entered with a normal wallet transaction. ERC-4626 vaults take an approve then a deposit and give you shares you can redeem at any time. Yield tokens accrue in their own price, so buying the token is the position and selling it is the exit. Rates come from DefiLlama and the issuers; a venue with no public feed shows no number rather than an invented one.

Community pools

Anyone can fund a pool in their own token. A stake earns amount x APY x lock days / 365, fixed at the moment it is admitted and deducted from the creator's reward budget. That is the whole solvency rule: a pool can never commit more than it holds, so it stops taking deposits instead of promising a rate it cannot pay. Locks run 30 to 365 days with a 7 day subscription window, and principal plus reward is claimable once the pool matures.

Vaults

Deposit ETH or USDG and yield accrues by the second at the published rate. Minimums are 0.005 ETH and 5 USDG, and a deposit is credited after 2 confirmations. Withdrawals pay yield first and then principal.

Fees

• Swap: the aggregator route and gas. Nothing on top from us.
• Earn: whatever the protocol charges. Nothing on top from us.
• Vaults: 10% of yield, never of principal, taken when you withdraw.
• Perps: no funding rate. Losses go to the pair liquidity, wins come out of it.
• Listing a pair: 0.05 ETH plus at least 0.05 ETH of seed liquidity.

Perps

Positions are margined and settled in ETH against your trading balance, from 0.005 ETH up. Memecoins, Chainlink-priced stocks and commodities go to 5x; community-listed pairs are capped at 2x because thin markets gap. Liquidation sits at 100 / leverage percent from entry and a sweep closes anything past it every few seconds. There is no partial liquidation: past the line you lose the margin.

Risk disclosure

This is software for moving money into volatile markets, and you can lose all of it. Specifically:

• Market risk. Leverage makes small moves total. Tokenized equities trade 24/7 while their underlying market is closed, so prices can gap at the open.
• Issuer risk. A tokenized stock is a claim on its issuer, not a share registered in your name.
• Smart-contract risk. Earn venues are third-party protocols. Their code is their own.
• Treasury risk. Vault, perp and pool balances depend on a wallet we control. Its address is published above so you can watch it.
• Token risk. Anyone can list a pool or a pair. A token can have mint or pause rights its holders never see. Read the contract on Blockscout.

Terms

The app is provided as is, with no warranty and no guarantee of uptime, price accuracy or continued availability of any venue. Nothing here is financial advice or an offer to sell securities. You are responsible for whether using it is legal where you live and for your own taxes. Do not use it if you are subject to sanctions.

Privacy

There is no account and no sign-up. We store the wallet addresses that interact with the treasury products, the amounts and the transaction hashes, because the ledger needs them. We do not collect names, emails or documents. Anything you do on-chain is public by definition.

Questions the docs do not answer are usually on the landing page FAQ.