Finchartist API documentation explains the API, it’s usage and examples. You can get YOUR_API_KEY here.
Chart Endpoint
https://financial-chart-images-api1.p.rapidapi.com/chartAvailable Query String Parameters And Options
"exchange":"NYSE" or "NASDAQ"
"symbol":"<REQUIRED>"
"chart_type":"candlestick" or "bar" or "line"
"outputsize":"100"
"volume":"true" or "false"
"grid":"true" or "false"
"interval":"1day" or "1week" or "1month"