For visitors to Merida, you might want to note that in addition to taxis you have several ride sharing operators. Of course Uber but also Cabify and a new one In Driver. I try to use anyone but Uber and mostly Cabify which registers the vehicles so, unlike Uber, I do not have to sit in front and pretend to be a friend of the driver. Prices are much the same and in addtion, Cabify always gives you a bottle of water.
The In Driver is an interesting concept. You name your price and quickly you will get many drivers who either accept or offer slightly more. Up to you to pick one. They are a large company but Russian based. Only accepted which is good since I am not likely to give them credit info!