Simple RESTful Geohashing interface
CSV:
/LAT,LON
/LAT,LON/YYYY-MM-DD

Atom:
/atom/LAT,LON
/atom/LAT,LON/YYYY-MM-DD

where LAT and LON are latitude and longitude expressed in decimal format (only integer portions are needed).

Additionally:

/dji
/dji/YYYY-MM-DD