I would keep an eye on it. You are looking for, black discolouration, bleeding, infection, unable to use foot, and anything else out of the ordinary.
Be sure your bird eats and drinks normally too..
The problem with chains, like those single chains, is the bird will grab the chains and play with the toy, but then the toy turns and traps their nail/toe. I think a bloody toe is one of the better outcomes of this type of incident (some birds aren´t able to get free and panic

)
Some toys and swings come with chains, and while some birds never have any problems, others do. Here is a super quick and easy way to cover the chains on toys, especially for those birds who like to climb up, to stop their toes/toenails getting trapped in the chains... Here is Gíslis silly...
forums.avianavenue.com
Double check the rest of the cage still, just in case this was something else.