Is there a way to setup custom slippage below 0.10... @curvefi

No, it is not possible to set up custom slippage below 0.10% in the UI. This is because slippage is determined by the market conditions and the amount of liquidity available at the time of a trade. As such, it is not possible to set a custom slippage below 0.10% as the market conditions and liquidity will always be in flux.

It has always been possible

there is