Some of the Greek deals were named after figures in Greek mythology. One of them, for instance, was called Aeolos, after the god of the winds.

The crisis in Greece poses the most significant challenge yet to Europe’s common currency, the euro, and the Continent’s goal of economic unity. The country is, in the argot of banking, too big to be allowed to fail. Greece owes the world $300 billion, and major banks are on the hook for much of that debt. A default would reverberate around the globe.

A spokeswoman for the Greek finance ministry said the government had met with many banks in recent months and had not committed to any bank’s offers. All debt financings “are conducted in an effort of transparency,” she said. Goldman and JPMorgan declined to comment.

While Wall Street’s handiwork in Europe has received little attention on this side of the Atlantic, it has been sharply criticized in Greece and in magazines like Der Spiegel in Germany.

“Politicians want to pass the ball forward, and if a banker can show them a way to pass a problem to the future, they will fall for it,” said Gikas A. Hardouvelis, an economist and former government official who helped write a recent report on Greece’s accounting policies.

Wall Street did not create Europe’s debt problem. But bankers enabled Greece and others to borrow beyond their means, in deals that were perfectly legal. Few rules govern how nations can borrow the money they need for expenses like the military and health care. The market for sovereign debt  the Wall Street term for loans to governments  is as unfettered as it is vast.

“If a government wants to cheat, it can cheat,” said Garry Schinasi, a veteran of the International Monetary Fund’s capital markets surveillance unit, which monitors vulnerability in global capital markets.