Thank you for contacting us and sharing your observation.
We suggest utilizing real-time WebSocket to access the most recent two candles in the intraday timeframe. Specifically, for 1-minute and 30-minute intervals, we provide two candles, which include the current one and the previous one.
Regarding the delay in the cache response, we have implemented caching for the intraday REST API to improve performance. Currently, we are examining the possibility of optimizing the current Time To Live (TTL) for the cache.