On Rev.ai- Speech to Text API's Privacy Page you can request and collect all the privacy and GDPR related information that Rev.ai- Speech to Text API is providing.
The privacy policy by is a legal document or statement that discloses how Rev.ai- Speech to Text API gathers, uses, discloses, and manges their customers' data.
The basis for Rev.ai sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.