TwittrAPI
Public Twitter/X data: profiles, tweets, replies, search, followers, lists, communities, trends
Read and write vk data.
vk API is a free Social API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Yes. The vk API is listed in the Social category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The vk API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the vk API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The vk API is served over HTTPS, so it's safe to use in production.