Thank you for your interest in Barchart market data services and for taking the time to contact us. Barchart OnDemand API's start at $500/month - if you would like more information, please let me know. Alternatively, Barchart offers an Excel add-in service for $69.95/month which provides many of the same API/data services, but within Excel: real-time data, unlimited historical data, stock fundamentals, technicals, and equity options data. You can learn more plus register for Excel using the link below, but also feel free to let me know if there is any additional assistance I can provide. 

Barchart Excel: