SpotMarketOptions - constraints on MaxPrice

Hi, While troubleshooting a Terraform error, I found that the lowest value for MaxPrice in SpotMarketOptions when launching an instance is 0.001

https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_SpotMarketOptions.html does not mention this.

At the time of writing, t4g.nano in ap-south-2 is listed at a spot price of 0.0008 in https://spot-price.s3.amazonaws.com/spot.js (I really hope this post doesn't cause that to go up!)

This raises two questions:

• Is there any other way to specify "terminate my instance if the price rises at all"?
• Does AWS round up to 0.001 USD?

Thanks, Adam