https://api.us.nylas.com/v3/metrics/tracking/summaryReturn an engagement summary
Returns your open and click rates for a date window, compared with the previous window of the same length, with the counts behind them. Use it to see whether engagement is going up or down.
The open rate is the share of messages with open tracking that were opened at least once. Treat it as a trend rather than an exact count: some mail clients and privacy features load images automatically, which counts as an open. Messages count on the day they were sent, so rates for recent days keep rising as recipients open them.
Query parameters
The first day of the window, as a UTC date in YYYY-MM-DD format. Defaults to six days before
end, so the default window covers 7 days. A window can cover up to 365 days.
The last day of the window, as a UTC date in YYYY-MM-DD format. Defaults to today. Today is
included as a partial day.