I have bought (1) property off auction.com
I had to submit an earnest money deposit of 2500 or a percentage before I could bid, whichever was higher.
There was a reserve on the property. I called and asked about the reserve and the told me they could not give me an exact number but they could do what they call the "stoplight system." Just like a traditional stoplight red, yellow, green. They asked me what I was willing to bid up to and would give me a light color based on the likelihood that my bid would get accepted. Red not likely, yellow possibly, and is green very likely. If it was red you could adjust your answer. In my case I was green right off the bat.
During the auction itself they have feature where if you bid in the last "x" amount of time the clock resets to allow competitors to bid. I forgot the specifics but I think it added an entire extra minute. My final battle was about a half hour.
Payment was due in full within 24 hours via bank wire transfer (- the EMD). Some auctions also have a buyers premium or something like that as an additional charge of 5% I believe. It says it in plain sight so you can keep that in your mind when coming up with a number for your max bid.
I made payment the next day. My contact stated I had 30 days to close and I would receive a special warranty deed. If i didn't close within the time frame I would get a quit claim deed and a fee tacked on for each day.
******The closing was my only issue with this process. I was contacted within a few days from the appointed lawyer who got my info and said they would be in touch as soon as they could. After a week I reached out and they were "waiting on paperwork". And same deal after 2 and 3 weeks. Finally on day 26 which was a Monday afternoon they reached out and said we need to close by Friday. I could not even call any lawyers until Tuesday. Luckily I found a lawyer to make it work on 4 days notice.
I signed and took keys on that Friday.
Sorry for the long post but I wanted to be thorough and I hope it helps.
Don't hesitate to reach out if you have any questions. PM I don't check my notifications as much as a should