Intraday chart bars for a ticker
Returns time-bucketed bars aggregating options activity for the underlying (call/put volume + premium, P/C ratio, bid/ask execution split) plus the underlying stock price at each boundary. Backed by the same intraday rollup tables that power the chart modal in the Skylit UI.
Field naming. This endpoint returns snake_case keys
(passed through from the internal intraday store). All other
/v1/underlying/* endpoints use camelCase. A future revision
will reconcile this; encode against UnderlyingChartBar for now.
Authorizations
Skylit API key in the Authorization header
(Authorization: Bearer fs_live_<key>). X-API-Key is also accepted.
Path Parameters
Underlying ticker symbol (uppercase, e.g. SPY, AAPL).
"SPY"
Query Parameters
Trailing window covered by the bars (e.g. 1D, 7D, 30D).
"1D"
Bucket size — 1min, 5min, 15min, 30min, or 1d.
1min, 5min, 15min, 30min, 1d 
