>Is this legal?

>Yes, to the best of our knowledge. 7 U.S. Code § 13-1 prohibits "contract[s] for the sale of [...] onions for future delivery [...] on or subject to the rules of any board of trade in the United States." The San Francisco Onion Futures Company is not a board of trade, defined as an "organized exchange or other trading facility". We sell contracts privately to individual buyers, and do not operate any exchange or secondary market.

Performance art against that law?

Also November onions are an absolute steal compared to the adjacent months!

https://en.wikipedia.org/wiki/Onion_Futures_Act

(which also banned box office receipt futures)

A fun thing is to go on FRED and make a graph with prices from onions and, say, corn to see the differences in volatility.

https://onionfutures.org

https://www.ams.usda.gov/mnreports/fvdidnop.pdf

Readers may wish to skip ahead to page 4, where onions are discussed.