Find OASA stops by name or by coordinate. Names may be in Greek or Latin characters ("Syntagma", "ΣΥΝΤΑΓΜΑ", "syntagma"); accents, case and common English spellings such as "Piraeus" all work. Passing lat and lon is the fastest and most reliable route and returns true straight-line distances in metres. If a name matches several stops, the candidates are returned rather than one being guessed, because Athens stop names repeat across the city. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

Live next-vehicle arrivals for one OASA stop, in minutes, with each vehicle joined to its line number and destination. Accepts a stop name in Greek or Latin characters ("Syntagma", "ΣΥΝΤΑΓΜΑ") or an exact stop_code. If a name matches several stops the candidates are returned instead of one being guessed. An empty result is normal and not an error — outside roughly 05:00-00:30 Europe/Athens most lines are not running. Minutes are OASA's own live estimates, not timetable times; use line_schedule for scheduled departures. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

Which OASA lines and routes call at a given stop — the "what can I catch from here" question. Accepts a stop name in either script or an exact stop_code. This is scheduled network data, not live: use stop_arrivals for actual waiting times. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

List or search OASA lines. Match by the rider-facing number ("040", "Α1", "X95", matched exactly) or by name in Greek or Latin characters. There are around 470 lines, so always pass a query unless you genuinely need a sample; the total is reported so you can tell whether to narrow. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

The direction variants (routes) of one OASA line, with destination and length. A line usually has an outbound and a return route, and often extra variants for night service, weekends or diversions. Other tools need the route_code from here. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

The ordered list of stops along one OASA route, with coordinates. Needs a route_code from line_routes — a line has several routes and each has its own stop sequence. Long routes have 90+ stops, so results are paged. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

Current GPS positions of OASA vehicles on a route or line, with heading and the age of each report. Positions are typically seconds old, but a vehicle that has stopped reporting is flagged stale — check age_seconds before presenting a position as current. An empty result outside service hours is normal. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

The geographic path of one OASA route. Defaults to a summary (length, bounding box, endpoints) because raw shapes run to hundreds of points; request "coords" or "geojson" only when the geometry itself is needed, and it will be simplified to the requested point budget with endpoints preserved. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

Scheduled departure times for one OASA line, by direction and service day — the tool for "when is the first/last bus". Defaults to the service day matching today in Athens. Departures after midnight are flagged next_day and sorted after the late-evening ones. Circular lines have only one direction. These are timetable times, not live estimates; use stop_arrivals for what is actually coming. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.

The timetable variants (service days) published for one OASA line, such as weekday, Saturday and Sunday. These codes are seasonal — the current set is the winter one — so they must be read rather than assumed. Feed a schedule_day_code from here into line_schedule for an exact timetable. Covers Attica (greater Athens) only: OASA buses, trolleys, metro and tram.