Over the first and final trading hour when the US inventory market opens, some limitation to the level of historic data you could down load is imposed. + IDEALPRO now utilizes MIDPRICE instead of BID to get cleaner backfill, but consumer can switch again to BID in config display https://amibrokerdatafeed20741.tblogz.com/a-review-of-amibroker-data-feed-42233895