Overview
Lender APY on Atomic is computed bottom-up from real protocol revenue. There are no token rewards, no inflationary subsidies, and no smoothing - the rate floats with trader activity in real time.
APY ≈ (lender share of trading fees + lender share of pool fees) / pool TVL, annualized.
Two yield sources
1. Protocol trading fees
Every trade pays 20 bps round trip (10 bps open + 10 bps close). A portion of this revenue is routed to the lending pool as lender yield.
This is the larger of the two streams during periods of active trading. The more notional flows through Atomic, the more lender yield is generated per unit of TVL.
2. Pool routing fees
The pool's capital is deployed to back leveraged positions, which means it ends up routed through Uniswap V3 (and other aggregator-selected venues) on every position open and close. As an LP-adjacent role, the pool earns its share of the swap fees on those routings.
This stream is steadier than direct trading fees but smaller in magnitude. It runs as long as the pool is being used, even at low aggregate volumes.
Lender share
Lenders collectively receive 25% of all platform revenue. The remaining ~75% covers protocol operations: development, audits, the bug bounty, and ongoing infrastructure. There is no team-only line item that takes precedence over lender payouts.
The split is calibrated to keep lender APY competitive with other USDC.e-yield venues (Aave, Pendle, etc.) while still funding the protocol's ongoing work. It is reviewed against actual cost data, not set-and-forget.
How accrual works
Yield accrues to depositor balances continuously, block by block. There is no claim transaction, no harvest, no compound button - your balance grows in place.
When you withdraw, you receive principal plus accrued yield in a single transfer. There are no separate yield tokens to redeem.
What drives the APY day-to-day
| Driver | Direction | |---|---| | Higher trading volume | APY ↑ | | Higher pool utilization (more lent out at once) | APY ↑ | | New deposits with flat volume | APY ↓ (TVL grows, fee throughput doesn't) | | Withdrawals with flat volume | APY ↑ (TVL shrinks, fee throughput stays) |
The current 10–40% range reflects ordinary fluctuations across these drivers. Sustained spikes during volatile market days have historically pushed the high end of the range; quiet weekends bring it down.
Comparing to other USDC.e yield
A quick gut-check against other passive USDC.e venues:
| Venue | Typical APY | Source |
|---|---|---|
| Atomic | 10–40% | Real trading fees |
| Aave USDC.e (Arbitrum) | ~3–7% | Borrow demand from leveraged loops |
| Compound USDC.e | ~4–6% | Same |
| Pendle PT-USDC.e | ~6–12% | Discount on future yield |
Higher APY on Atomic comes with the trade-off of pool-utilization risk on withdrawal - see Risk model. Comparable rates from token-emission farms come with token-price risk that USDC.e-paid yield does not.
When the APY changes
The displayed APY is a trailing rate based on the last 24 hours of activity. It is the best available estimate of forward returns but is not a guarantee.
If you deposit at 30% APY and trading volume halves the next week, your realized APY for that week will be lower than the dashboard showed at the moment of deposit. The mechanism is transparent - there is no hidden lockup or rate-cliff, but the rate itself is not promised.