"You betcha" is not used in Yucatán, Mexico, or any Spanish-speaking region. It is a colloquialism from the Upper Midwest and Northern U.S. (Minnesota, North Dakota, Wisconsin, Michigan's UP).
Associated with Scandinavian/German immigrant heritage in the region; popularized nationally by films like Fargo and politicians (e.g., Sarah Palin).
In Yucatán, you'd hear "¡Claro que sí!", "¡Por supuesto!", or "¡Sale!" (local slang) for enthusiastic agreement.