Anyone with an AWS account can use AWS Marketplace as a consumer and can register to become a seller. A seller can be an independent software vendor (ISV), value-added reseller, or individual that has something to offer that works with AWS products and services.

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Amazon® Seller University and FAQ | Learn How to Sell on Amazon

Yes. If you don’t want to be charged a monthly subscription fee, you can downgrade your account from the Professional plan to the Individual plan from the My Services page in Seller Central (login required). If you downgrade, your account stays open and you can keep offering items on Amazon as an Individual seller, but you’ll lose access to Professional plan benefits like bulk upload

Amazon MWS enables programmatic data exchange for listings, orders, payments, reports, and more. By using Amazon MWS, sellers can increase selling efficiency, reduce labor requirements, and improve response time to customers. To use Amazon MWS you must have an Amazon MWS-eligible professional selling account.