The first hour or so of bars are missing for today (2020-09-08). The first bar starts at 10:39, and this happens for many tickers including very high volume ones so I think there might be an internal issue.
Eg. The first bar for AAPL, F, MSFT etc all start at 10:39. This seems to only happen for 2020-09-08, so was there some kind of outage during the beginning of the day?
Specifically, the endpoint is:
https://data.alpaca.markets/v1/bars/1Min?symbols=AAPL&limit=1000&start=2020-09-08T09:30:00-04:00&end=2020-09-08T16:00:00-04:00
First Bar
{'AAPL': [
Bar({
'c': 117.23,
'h': 117.51,
'l': 117.15,
'o': 117.51,
't': 1599575940, (epoch time == 10:39 EST)
'v': 40539})
]}