Circle Internet Financial has launched a public Postman workspace designed to enhance the developer experience by allowing users to explore and interact with their APIs for Payments, Payouts, and Accounts. This initiative aims to streamline the connection between fiat and crypto transactions by providing request templates, available parameters, and configurable variables for authenticating API requests. Developers are required to register for a Circle sandbox account to access these features, which are available through a test environment. The APIs are organized into collections with preconfigured calls to facilitate testing, and developers are encouraged to review field requirements before making requests. Circle invites feedback from users to improve resources for building on USDC and offers additional documentation and newsletters for ongoing updates.