Not something I am aware off, it is one of the biggest domain marketplaces, other than it is a bit expensive. You could also try Escrow.
i don't think it's 100% safe, as you transfer the domain directly to the other part. One time i was selling via sedo a domain for 1000$ and as I transferred it,in 2 minutes it was transferred again, so i felt scamed, but anyway all went right.