Last nights prediction markets on the election were heavily traded relative to past PMs. Predictit alone had hundreds of millions of USD in trade volume. Many LWers competed on the markets, for reasons discussed here. If you competed, share your experience here.
I bet 4.5k on PredictIt with a spread of; likely Biden states (WI, MI, MN), Biden prez and popular vote. To pick my bets I used the Kelly betting algorithm with 538 stats and PredictIt's fees included. I only bet on the races with an kelly fraction (F) of .5 or more. The average F of the bets was .7. The spread would break even if Biden narrowly lost (Trump wins AZ, PA, GA, NC, FL), and only return negative with a major poll error of 8 points in the Great Lakes. Therefore I was watching FL for a large polling error.
After FL results came in I attempted to sell my Biden prez tix. PredictIt crashed, but I was among the first to refresh the page and sold my Biden tix at pre-election value of .66. Biden tix fell to .20 at 10:00 pm and I bought 1000 at .12 because I knew the redshift in Michigan was skewing the results. In total I gained about 20% on my portfolio over the night.