How to summon and sell your soul to Satan and other devils
Notes for those planning to sell your soul online: eBay specifically prohibits such transactions. [1] Compared to some online bans, the reasoning is pleasingly coherent.  eBay does not allow the auctioning of human souls for the  
   following reasons: If the soul does not exist, eBay could 
   not allow the auctioning of the soul because there would be nothing 
  to sell. However, if the soul does exist then, in accordance with 
  eBay's policy on human parts and remains, we would not allow the 
  auctioning of human souls.

This is unfortunate. eBay seems perfect as souls are by definition somewhat used.[1] https://www.businessinsider.com/soul-listing-policy-ebay-201...