Effective Jan 1st, 2021, Amazon Simple Queue Service (SQS) provides tiered pricing for monthly API requests. Tiered pricing will provide discounts based on your monthly usage of Amazon SQS. Amazon SQS is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. Using Amazon SQS, you can send, store, and receive messages between software components at any volume, without losing messages or requiring other services to be available.
Source:: Amazon AWS