(close - lower band) / (upper - lower) on Bollinger Bands. >1.0 = above upper; <0.0 = below lower. time_period=BB window (default 20), std=2.
x-api-key: ********************curl --location '/api/v1/indicators/percent_b?symbol=undefined&time_period=undefined&interval=undefined&range=undefined&outputsize=undefined' \
--header 'x-api-key: <api-key>'