Market breadth for one index. Pass the symbol from sentiment_breadth, for example GSPC.INDX. Points have date, the percent of constituents above their 20-, 50- and 200-day average, 252-session highs and lows, advancers, decliners, and the advance-decline line. A field is omitted when fewer than 75 percent of that day's constituents have the window. Optional from and to are YYYY-MM-DD. Costs 1 request unit. A delayed token omits the newest points, and the response includes pointsRemoved.