The closest thing to a real estate crystal ball in the last few years has been the house auctions that are regularly held around the country.

In 2006 and early 2007, the official housing statistics were still showing that house prices were holding up. But that was largely because so many sellers were refusing to sell. The auctions, made up mostly of foreclosed homes, showed the truth: house values were starting to plummet in many places.

So a few weeks ago, I decided to go to an auction at a hotel ballroom in Washington — and to study the results of several others elsewhere — with an eye to figuring out whether prices may now be close to bottoming out.

That’s clearly a huge economic question. Last week, JPMorgan’s chief financial officer told Eric Dash of The New York Times that JPMorgan, and presumably other banks, would be under pressure “until home prices stabilize and unemployment peaks.” As long as home prices are falling, foreclosures are likely to keep rising and the toxic assets polluting bank balance sheets are likely to stay toxic.

There are reasons, though, to think that prices may be on the verge of stabilizing. Relative to fundamentals, like household incomes and rents, houses nationwide now appear to be overvalued by only about 5 percent. You can make an argument that the end of the housing crash is near.

But that’s not what I found at the auctions.

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“This is a perfect storm of opportunity,” Bob Michaelis, goateed with a shaved head, told the 300 or so people who had come to downtown Washington for the auction.

Mr. Michaelis, the auction manager, spoke from a lectern on stage, and his goal seemed to be to persuade people that they might never see a buyers’ market as good as this one. Prices have plunged, and interest rates, he said, are at “generational lows.”

“Look around to your left and your right, and you’ll see someone who sees an opportunity just like you do,” Mr. Michaelis said. “We’re approaching the bottom of the market, I think. We’re approaching the bottom of the market, if we’re not there already.”

He then told the audience that, in the last 100 years, house prices have recovered from every downturn and gone on to reach record highs. Oh, and Wells Fargo and Countrywide were standing by, ready to offer financing to qualified auction buyers.

If nothing else, this sales pitch certainly had chutzpah. It combined the old bubble-era notion that house prices always rise over time (ignoring the fact that incomes, stock values and the price of bread do, too) with the new postcrash idea that houses must be a bargain because they’re a lot cheaper than they used to be. Even Countrywide, which was taken over by Bank of America after so many of its subprime mortgages went bad, is still part of the housing pitch.

Yet as soon as the auction began, it was clear that the pitch wasn’t working.

The winning bid on the first home auctioned off, a two-bedroom townhouse in Virginia Beach, was $115,000. Just last July, it sold for $182,000, according to property records. A four-bedroom brick house with a two-car garage in Upper Marlboro, Md., went for $375,000. Last year, it sold for $563,000.

Throughout the evening, such low-ball prices continued to win the bidding. At one point, the auctioneer, Wayne Wheat, interrupted his sing-song auction call to cheerfully ask, “Where are my investors?”

The tables that had been set up around the edges of the ballroom, reserved for people planning to buy multiple houses, were mostly empty. Many audience members, like the man in a camouflage baseball cap just in front of me, were attending their first auction.

On Sunday, my colleague Carmen Gentile went to a larger auction, in Miami, to see if my experience had been unusual. It wasn’t. The homes there also sold for just a fraction of what they would have even a year ago. The rate of decline in Miami hasn’t even slowed noticeably in recent months, according to data kept by Real Estate Disposition Corporation, known as R.E.D.C., which runs the auctions.

A recently transplanted New Yorker named Michael Houtkin won the bidding on a one-bedroom condominium on the outskirts of Boca Raton, a few blocks from three golf courses, for the incredible price of $30,000. “Things were almost being given away,” he said later.

As is often the case at these auctions, the seller of the condo — Fannie Mae — retained the right to refuse the winning bid and keep the property. But Mr. Houtkin told me he was optimistic his bid would be accepted. An R.E.D.C. employee suggested to him that $30,000 wasn’t much below the minimum price that Fannie Mae had hoped to receive.

How could that be? Because Fannie Mae, like many banks, is inundated with foreclosed properties. In recent weeks, banks have begun accelerating foreclosures again, after having held off while waiting to find out which homeowners would be eligible for the Obama administration’s assistance program.

The glut of foreclosed homes creates a self-reinforcing cycle. Falling prices lead to more foreclosures. Foreclosures lead to an excess supply of homes for sale. The excess supply then leads to further price declines. Jan Hatzius, the chief economist at Goldman Sachs, says that the “massive amount of excess supply” means that home prices nationwide will probably fall an additional 15 percent.

This estimate hides a lot of variation, too. In Miami, Goldman forecasts, prices could drop an additional 33 percent, which is pretty amazing since they’ve already fallen 50 percent from their 2006 peak.

Nor is excess supply the only reason prices still have a way to fall. Nationwide, homes may not be overvalued by much. But in some cities, including New York, San Francisco, Los Angeles, Boston, Chicago and Miami, they remain very expensive. So while Mr. Hatzius and his Goldman colleagues are somewhat more pessimistic than most forecasters, the difference isn’t enormous.

I’ll confess that this bearish picture isn’t exactly what I had hoped to find. A year ago, as part of a move from New York to Washington, my wife and I bought our first house. We did so fully expecting prices to continue falling (though perhaps not as much as they ultimately will, given the severity of the financial crisis). But we decided they had fallen enough for us to take the plunge. We preferred buying before the bottom of the market instead of renting and having to move again in a year or two.

Still, when I wrote about that decision last spring, I argued that anyone who didn’t have to move probably should not buy yet. Prices still had a way to fall.