This API serves JSON over HTTPs. It allows you to determine whether Mercury is in retrograde for a given date.
Mercury Retrograde can really suck. I experience communication breakdowns frequently when Mercury is in retrograde. Maybe you do too. Click here to learn more about it.
Basic Example
> curl https://mercuryretrogradeapi.com {"is_retrograde":true}
Options
The only available option is a 'date' parameter in the GET request. Just about any parsable date format should work, but YYYY-MM-DD is a safe bet.
> curl https://mercuryretrogradeapi.com?date=2016-09-14 {"is_retrograde":true} > curl https://mercuryretrogradeapi.com?date=2016-10-01 {"is_retrograde":false}
It's free (really)! We use this API in production at Gingr. As long as that app is around, this will be too.
Email me here.