OKEx historical market data details - instruments, data coverage and data collection specifics

Starting from October 2019 we and many other API users started observing frequent OKEx WebSocket real-time feeds disconnections and market data being provided with large delay every time there was a larger market volatility resulting in historical data gaps. In the last days of February 2020 OKEx enabled Cloudflare proxying for all their WebSocket traffic and since then situation has improved substantially.

Market data for OKEx exchange is collected separately for each market type, see details: