A Dutch man who went by the online handle "SuperTrips" agreed Thursday to plead guilty in Chicago federal court to hawking millions of dollars worth of illicit drugs on the now-defunct underground website Silk Road, the authorities said.

Cornelis Jan Slomp, who faces a maximum 40-year term and a forfeiture of $3 million in ill-gotten gains, sold drugs ranging from amphetamine, ecstasy, and cocaine to LSD and a slew of others, according to the court record.

Court documents (PDF) say that the 22-year-old man was arrested in Florida this summer when he traveled to the United States to expand his European operations. Several unnamed co-conspirators are also being eyed across the globe and in the United States.

Using the Silk Road site, SuperTrips performed 10,000 transactions worth 385,000 bitcoins, prosecutors said. Jan Slomp is among a handful of Silk Road vendors being prosecuted nationwide, while more are likely.

The defendant was accused of distributing worldwide about "104 kilograms of powder 3,4-methylenedioxy-N-methylamphetamine, also known as MDMA; 566,000 ecstasy pills containing MDMA; four kilograms of cocaine; three kilograms of Benzodiazepine; and substantial quantities of amphetamine, lysergic acid diethylamide (LSD), and marijuana, in addition to allowing substantial quantities of methamphetamine, ketamine, and Xanax to be distributed through his SuperTrips vendor account from March 2012 through August 2013," the authorities said.

Homeland Security agents during an undercover operation "surreptitiously entered the website and observed a vendor who had offered various controlled substances for sale for about 18 months," prosecutors said. Two years ago, they said, authorities at O'Hare International Airport discovered a package from the Netherlands containing ecstasy hidden in two DVD cases.

"During the investigation, agents collected more than 100 similar envelopes in Chicago, each mailed from the Netherlands or Germany, containing various controlled substances," the Chicago US Attorneys Office said in a statement.

Silk Road, the online drug bazaar that prosecutors said arranged more than $1 billion in sales, went defunct this fall when its alleged operator, Ross William Ulbricht, was arrested on drug and other charges.

Despite Silk Road's demise, new "darknet" sites to buy drugs, weapons, and other illicit paraphernalia have emerged. The latest is called Grams and requires a Tor connection, and it has an intuitive Google-like interface to find sites not indexed by standard search engines.