Amazon Web Services (AWS) pricing context

AWS Step Functions uses a pay-per-use model with no upfront costs. Standard Workflows are billed at $0.000025 per state transition (US East N. Virginia), with a permanent free tier of 4,000 state transitions per month. Express Workflows are billed at $1.00 per million workflow requests plus a duration charge of $0.00001667 per GB-second for the first 1,000 GB-hours, with tiered pricing at higher volumes. Retries count as additional state transitions for billing purposes. Additional AWS service costs (Lambda invocations, ECS tasks, PrivateLink data transfer, etc.) are charged separately at their respective service rates. There are no idle charges; Standard Workflows can pause for up to one year without incurring state-transition costs during the wait.