You can find documentation for how to view your email statistics via the UI here. To view Email Statistics via the API:
package main
import (
"fmt"
"log"
"os"
"github.com/sendgrid/sendgrid-go"
)
func main() {
apiKey := os.Getenv("SENDGRID_API_KEY")
host := "https://api.sendgrid.com"
request := sendgrid.GetRequest(apiKey, "/v3/stats", host)
request.Method = "GET"
queryParams := make(map[string]string)
queryParams["aggregated_by"] = "day"
queryParams["limit"] = "1"
queryParams["start_date"] = "2017-01-01"
queryParams["end_date"] = "2017-10-12"
queryParams["offset"] = "1"
request.QueryParams = queryParams
response, err := sendgrid.API(request)
if err != nil {
log.Println(err)
} else {
fmt.Println(response.StatusCode)
fmt.Println(response.Body)
fmt.Println(response.Headers)
}
}