DEX fees

Understanding extra service fees charged by DEXes
Squid does not charge any DEX fees, but swaps are routed through other DEXs, such as Uniswap, Curve and Osmosis, who do charge fees. These fees are included in the total amount out provided by the widget's quote.
Squid currently earns no revenue from swaps, but has fee contracts audited, and will introduce a small fee in the future.

Do you charge positive slippage?

Squid does not keep positive slippage on trades.