"Un x100to" (an abbreviation of "Un Porciento" in Spanish, meaning "One Percent" in English[A]) is a song by the American band Grupo Frontera and Puerto Rican rapper Bad Bunny.

After Bad Bunny called himself a "big fan" of regional Mexican music, the song marks only the second time the artist tapped into the genre, following the remix of "Soy el Diablo" by Natanael Cano.

[6] It tells the story of a person missing their former partner, calling them with just one percent of battery left on the phone and sending messages that keep them awake.

[8] The song features a similar chord progression to the 1995 Tejano classic "Desvelado" by fellow Edinburg, Texas regional Mexican artist Bobby Pulido.

Shortly after the song's release, Pulido interpolated the chorus from "Un x100to" into his own performance of "Desvelado" at a festival in Monterrey, Nuevo León.