The text discusses the evolution of API Transformer, a tool that converts between different API description formats, such as OpenAPI, RAML, and Postman. The tool has seen significant improvements in 2017, including support for OpenAPI 3 and WSDL. An analysis of user data reveals that OpenAPI 2.0 is the most commonly imported format (24%), followed by Postman 1.0 (50%). The majority of users are based in the US and India, with a significant number performing thousands of conversions every month. API Transformer's web UI and simple API have been widely used for conversions, with 76% of total conversions made using the API. Additionally, the tool has helped identify common mistakes and invalid/unsupported files that prevented proper identification. The analysis also highlights trends in format conversions, geographical usage, and API size.