The minimum threshold to invest on HAL is $50 per bot. The allocation will be adjusted in increments of $50.
The unique subscription of 19,9€ will allow you to invest up to 100.000$, without any extra charge.
The smaller your portfolio, the smaller your positions and therefore the lower your performance.
You should also be aware that the robot will very rarely use your entire allocated portfolio. This has the effect of reducing your exposure to market fluctuations, resulting in a lower risk of capital loss in case of a bad position or high volatility in the wrong direction.