11:46pm: Here's the link to Arangure's story at ESPN, which contains quotes from API and Chapman.
11:11pm: Aroldis Chapman has dropped Athletes Premier International as his agents, according to ESPN's Jorge Arangure Jr. The move was first reported by Jorge Ebro of El Nuevo Herald, who also said that Chapman is now represented by the Hendricks Brothers. Randy Hendricks, who already represents one Cuban defector in Kendry Morales, confirmed the switch to Arangure.
The timing of a switch seems a bit odd, because Chapman has just finished up meeting with several clubs, including the Yankees, Red Sox, and Mets. Presumably API was present and involved during those meetings, though I can't say that with any certainty.