There is no Uber here
Uber and DiDi are not authorized in the state of Oaxaca. The apps sometimes show cars on the map; in practice you will not get a ride. Do not plan your arrival around them.
What does exist: taxis de sitio, mototaxis, and colectivos — shared pickups running the coast highway between the town, Zicatela and La Punta for a small fixed fare. Cheap and frequent, but a daytime thing.