Federal law enforcement agents on Monday arrested a Brooklyn Internet merchant who mistreated customers because he thought their online complaints raised the profile of his business in Google searches.

The merchant, Vitaly Borker, 34, who operates a Web site called decormyeyes.com, was charged with one count each of mail fraud, wire fraud, making interstate threats and cyberstalking. The mail fraud and wire fraud charges each carry a maximum sentence of 20 years in prison. The stalking and interstate threats charges carry a maximum sentence of five years.

He was arrested early Monday by agents of the United States Postal Inspection Service. In an arraignment in the late afternoon in United States District Court in Lower Manhattan, Judge Michael H. Dolinger denied Mr. Borker’s request for bail, stating that the defendant was either “verging on psychotic” or had “an explosive personality.” Mr. Borker will be detained until a preliminary hearing, scheduled for Dec. 20.

The arrest came eight days after The New York Times published a lengthy account of Mr. Borker’s campaign of intimidation against a woman named Clarabelle Rodriguez who had bought a pair of glasses from DecorMyEyes over the summer.