I'm confused about pricing. I come from using AWS Lambda, where you pay for the amount of memory allocated for your function, how many times it runs and how long each run is.

Looking at Now, it looks like you are billed by the 'plan' that you choose, and that decides how many deployment instances you are limited to. What does a deployment instance mean for something that is 'serverless'?

EDIT: Whoops, I see that there are 'on demand' prices for deployment instances too--now I just need to figure out how deployment instances map to serverless.