The list of perks originally included a private Greek island for whoever could come up with the 1.6 billion euros in full, but Feeney had to retract the offer.
"I thought that Mr Tsipras would happily accept that (the sale of the island), but Indiegogo emailed me to say that as the Greek Government had not officially agreed to this, I wasn't allowed to offer it," he said.
A Greek woman also emailed him, saying she found the perk "offensive."
Feeney told CNBC he'd apologized profusely to the woman.
"I was only thinking something (an island) about the size of Inchmarnock off the coast of Scotland, which I'd definitely sell if it saved the British economy," he said.
Feeney hasn't contacted any Greek leaders or their creditors. However, he said a journalist had conveyed a rumor that Tsipras was looking to get in touch.
As for how he might eventually get the cash to Greece and its creditors, he said he'd turn to Indiegogo for help.
"I suspect that there'll be plenty of people, better qualified than I am, that would be willing to help," he said.
Neither the Greek Prime Minister's office, the International Monetary Fund nor the European Commission responded to CNBC emails requesting comment.
Feeney is originally from York in the north of England. He previously worked as a marketing manager at events technology company Noodle Live, according to his Facebook profile.