It was more than 500k, maybe only 500k was reported.

His wife was also a big DNC donor.

Federal prosecutors who built a case against Rich were irate by his pardon on Clinton's last day in office.

Clinton's critics alleged that Rich's pardon had been bought, as Denise Rich had given more than $1 million[37] to Clinton's political party (the Democratic Party), including more than $100,000 to the Senate campaign of the president's wife, Hillary Rodham Clinton, and $450,000 to the Clinton Library foundation during Clinton's time in office.[32]

edit: I forgot Eric Holder was also involved in the Rich pardon! Rich's lawyer, Jack Quinn, had previously been Clinton's White House Counsel and chief of staff to Clinton's vice president, Al Gore, and had had a close relationship with Holder.[33] According to Quinn, Holder had advised that standard procedures be bypassed and the pardon petition be submitted directly to the White House

Marc Rich received a pardon from U.S. President Bill Clinton on January 20, 2001, Clinton's last day in office.[6][15] The pardon became controversial after reports surfaced that Denise Rich had made donations totalling more than $1 million to the Democratic Party and the Clinton Presidential Center.[6][15] At a congressional hearing into whether the pardon was granted in exchange for her contributions, Rich invoked the Fifth Amendment to the United States Constitution, which denies the government power to compel self-incrimination.[6][15]