Are US 1 dollar silver certificates worth anything?

In circulation they're always worth the face value of the bill. As for the collector value, in very good condition (not a grading phrase) they will usually be worth $3-$4 depending on the year they were printed, and possibly much more if they're older than 1935, or are special such as the wartime bills printed for use in Hawaii and North Africa. If in mint condition they could be worth a few dollars more. There are exceptions that are worth much more.

See related link below.