Yes, although the API is still subject to change.
SupplierSelect now exposes two distinct REST APIs, one for RFP issuers (buyers) and the other respondents (vendors).
Both APIs are documented using Open API (formerly Swagger )
Development Status and API Stability
SupplierSelect's APIs are being developed as part of Chatwin, the next version of SupplierSelect. Development is proceeding and the APIs are still undergoing revision. However, if you have a specific task that you'd like to automate please contact us for details.
We will be publishing the stable API in late 2018.