Dear- Regarding yahoo/google equity data feed, 1) Do they provide ONLY daily close? How about 15-min intraday? or 5-min? 2) What else company (free or non-free) provide 15-min or 5-min? Please note that personally i do NOT need 1-min data.
Other than a dedicated platform and datafeed. I don't believe you are going to locate any "Free" reliable data feed. Probably the lowest cost option for EQUITY data is Tradingview pro real time web. Nice web based charting platform and reasonably priced. $20/month or 1-2 year deals are available @ approximately $16/$12 per month, making it very reasonable for real time equities exchange data https://www.tradingview.com/ https://www.tradingview.com/features/ https://www.tradingview.com/gopro/ Normally during trial period you will be offered a one year discount. You can register or use Tradingview for free, however, then you will only get bats data [delayed] the exchange data [equities] is well worth the minimal fee asked.