Pool fees
Each liquidity pool charges its own fee per swap hop. These fees are set by the pool operators (Vortex, Fluxbeam, Fogo.fun, Moonit) and are deducted from the swap amount automatically. ThefeeBps field in the quote response shows the total fee across all hops in basis points (bps, where 1 bps = 0.01%).
Aggregator fees
Argyros may charge a small protocol fee on certain routes. This fee is included in thefeeAmount field of the swap and instructions responses, denominated in the output token’s smallest units.
No hidden fees
The amounts returned by the API (amountIn, amountOut) already account for all fees. What you see in the quote is what you get on-chain, subject to slippage tolerance.