01Overview

Filler is four products on Robinhood Chain behind one wallet: yield vaults for ETH and USDG, a swap across every tokenized asset on the chain, leveraged perps settled in ETH, and staking pools anyone can open for their own token.

Vaults are the simple case. Each accepts one asset, runs a single strategy on it, and credits what it earns to your position continuously. You deposit from your wallet and the balance grows every second at the vault rate. Withdrawing returns principal plus accrued yield. There is no claim step, no lockup and no withdrawal queue.

Custody is split and marked wherever it applies. Swaps are non-custodial: your wallet signs and the tokens land in it directly. Vault balances and the trading balance are custodial, held in the protocol treasury, and withdrawable on demand.

02Getting Started

1. Add Robinhood Chain to your wallet (chain id 4663, currency ETH, explorer Blockscout).
2. Hold some ETH for gas and the asset you want to deposit.
3. Open the app, connect your wallet and pick a vault.
4. Enter an amount and confirm the deposit transaction. The position is credited once the transaction confirms.

03Vaults

Each vault accepts a single asset on Robinhood Chain: ETH (the chain's gas token) or USDG, the Paxos-issued Global Dollar stablecoin. Your position earns the vault rate continuously from the moment a deposit confirms.

Yield is sourced only from on-chain activity - staking rewards, lending interest and liquidity fees. No vault pays yield from token emissions or from other depositors.

03aAssets & Swap

The asset registry lists every Robinhood-issued stock and ETF token (ERC-20, 18 decimals), the majors bridged to Robinhood Chain, USDG and other stablecoins, yield-bearing tokens and every memecoin with a live DEX market. Prices are pulled live from LI.FI and DexScreener.

Swap routes through the 0x Swap API with LI.FI as fallback. Your wallet signs the transaction directly; the app never holds your funds. ERC-20 sells need a one-time approval to the aggregator. Stock tokens trade 24/7 at DEX prices, which can drift from the underlying market outside US hours.

03bOn-chain Earn

Earn lists yield venues that a wallet transaction genuinely enters: ERC-4626 vaults (Morpho Steakhouse USDG, Spark spUSDG) where you approve and deposit USDG and can redeem at any time, and yield-bearing tokens (Maple syrupUSDG, Ethena sUSDe, Midas MGLO) where buying the token is the position because yield accrues in its price. Rates are fetched live from DefiLlama and the issuers; venues with no public feed show no number.

Community pools let anyone fund a reward budget in any Robinhood Chain token and set a fixed APY and lock. Stakers send tokens to the pool vault, the reward is fixed at stake time and deducted from the budget so the pool can never owe more than it holds, and principal plus reward is claimable after the unlock date.

03cPerps

Long or short memecoins, tokenized stocks (Chainlink-priced) and metals and energy with up to 5x, settled in ETH against a trading balance deposited to the treasury. Custom pairs list any DEX-traded token at 2x with creator-funded liquidity. Positions past their liquidation price are closed by a cron sweep.

04Deposits & Withdrawals

Deposit. Open the app, pick a vault and enter an amount. ETH is sent as a normal transfer; USDG is sent with an ERC-20 transfer. Once the transaction has two confirmations the deposit is credited to your position.

Withdraw. Enter an amount up to your vault balance. Accrued yield is paid first, then principal, and the payout is sent to your connected wallet in the same asset.

Minimum deposit and withdrawal sizes are set per vault to keep gas costs proportional and are listed on each vault.

05Fees

• Performance fee - charged on yield earned by the vault, taken at harvest. Never charged on principal.
• Deposit / withdrawal fee - none.
• Management fee - none.

The exact performance-fee rate is a public parameter on each vault contract and is shown on the vault before you deposit. Network gas is paid by the user as normal.

06Risk Disclosure

Depositing into a vault carries risk. You may lose some or all of your deposit. In particular:

• Smart-contract risk. Vault and strategy contracts may contain bugs, even after audits.
• Strategy risk. Underlying protocols (staking, lending, liquidity pools) can fail, be exploited or change parameters.
• Issuer risk. Tokenized stocks depend on their issuer and on the off-chain assets backing them.
• Market risk. Yield is denominated in the deposited asset; the asset itself can fall in value.

Nothing in these docs is financial advice. Deposit only what you can afford to lose.

07Contracts

The treasury address is shown in the app before every deposit and will be published here before launch.

08FAQ

• What is Filler? Four things on one chain: yield vaults for ETH and USDG, a swap across every tokenized asset on Robinhood Chain, leveraged perps settled in ETH, and staking pools anyone can open for their own token. One wallet, one balance, no sub-accounts.
• Do I need an account? No. Connect an EVM wallet and you are in. There is no sign-up, no email and no KYC. Your wallet address is the account, and disconnecting it is how you log out.
• Where does the yield actually come from? Staking rewards on the chain's native asset, lending interest on stablecoins, and fees from the on-chain venues we route to (Morpho, Spark, Maple, Ethena). Rates are read live from those venues. Nothing is paid from token emissions or from other people's deposits.
• Are there lockups or withdrawal queues? Not on the vaults. Principal and accrued yield can be withdrawn to your wallet at any time. Community pools are different by design: a pool has a subscription window and a fixed unlock date, both shown before you stake.
• What are the fees? A performance fee on earned yield only. No deposit, withdrawal or management fee on principal. Trading pairs charge a listing fee to the creator, not to traders. Exact numbers are in the docs.
• Is Filler custodial? Partly, and it is marked wherever it applies. Swaps are non-custodial: your wallet signs and the tokens go straight to it. The vault balances and the trading balance are custodial, held in the protocol treasury, and withdrawable on demand.
• Which assets can I deposit? ETH and USDG, the Paxos-issued Global Dollar native to Robinhood Chain. Bridge in from Ethereum or Arbitrum, or swap into them here. Tokenized equity vaults are next.
• What are the risks? Smart-contract risk, strategy risk, issuer risk on tokenized assets, and liquidation risk on any leveraged position. Leverage can take your whole margin. Read the risk disclosure in the docs before you deposit anything you cannot afford to lose.

09Terms & Conditions

Filler is provided as open, permissionless smart contracts and an interface to them. By using the interface you agree that you do so at your own risk, that you are not located in a jurisdiction where such use is prohibited, and that Filler has no control over the underlying blockchain or third-party protocols.

The interface is provided “as is” without warranty of any kind. Full terms will be published before launch.

10Privacy

The interface does not require an account and does not collect personal information. Wallet addresses and transactions are public on Robinhood Chain by design. The interface may use privacy-preserving analytics to count page views; no cookies are set for tracking.