Rewards on Stablecoins

Your USD balance can earn rewards without a separate DeFi app, a second wallet, or gas fees. Fiber puts eligible stablecoins into lending vaults, keeps the position private, and shows your rewards growing in your balance.

Rewards are on by default. They are optional and variable, and they come from third-party lending markets.

How rewards work

Eligible stablecoins in your USD balance are deposited into these vaults:

New USDC goes to the Base vault. New USDT goes to the Arbitrum vault, except USDT on BNB Smart Chain, which stays there. Earlier deposits can also sit in older Morpho vaults on Ethereum. The vault shares are shielded into your private 0zk wallet, and Fiber handles the routing, the onchain steps, and their network fees. You never interact with Morpho or Aave directly.

Native coins such as ETH and BNB, and other assets held at public addresses, don't earn.

Where rewards come from

Borrowers in the vaults' lending markets pay interest to use the liquidity. That interest, less the vault's and Fiber's shares, is what your balance earns. Fiber provides access to the vaults. It does not generate or guarantee the rewards.

Rates and earnings

Home shows Rewards followed by your current rate, and roughly what you'd earn in a year. Your USD balance screen shows what you've earned since you joined, an estimate per year, and a ten-year chart of your balance with and without rewards. Breakdown lists each coin and network with its rate, or Not earning.

Your rate is the average of your vaults, weighted by how much sits in each. Estimates assume today's rate. Rates move with borrowing demand, liquidity, and market conditions, and past rates don't guarantee future rewards.

Fiber's fee

Fiber keeps 25% of the rewards your balance earns. The vaults take that share continuously as rewards accrue. Every rate and earnings figure in the app is already shown after the fee. There's no fee on the balance itself.

Turning rewards on or off

On Home, tap your USD balance under Stablecoins, then use the Earn rewards switch. Fiber asks you to confirm it's you. With rewards off, your USD balance shows as Not earning.

Spending money that earns

You can send or trade money that is earning rewards. Fiber takes it out of the vault as part of the transaction. Cash you use to buy an asset stops earning.

With rewards on, selling a listed asset to USD routes the proceeds into one of the active vaults above: Morpho on Base, Aave on Arbitrum, or Aave on BNB Smart Chain. Fiber compares routes and chooses the best output. This does not move balances already held in older Ethereum vaults.

Risks

Earning rewards involves risk, including:

• Smart-contract vulnerabilities, or failure or exploitation of Morpho, Aave, or a vault
• Borrower defaults, bad debt, or problems with collateral or price oracles
• Liquidity limits, which can delay taking money out of a vault
• Stablecoin depegging
• Underperformance, and changing or declining rates

Eligible assets, vaults, rates, and processing times may change over time.