I am looking for the source on reliable/filtered intraday data (in various downloadable file formats). Mostly I am interested in 30/60 min bars. So far, I have talked to QCharts. They provide intraday data downloads. They also admit that their intraday data is not 100% reliable . When I have asked the rep if he knows of any provider for reliable intraday data, he mentioned Bloomberg as the only alternative (quite costly). Does anyone know other providers of high quality intraday data? Thanks!