I'm guessing that you are asking about a "Title Search". In which case, a search is completely negotiable and can be typically paid by the Buyer or the Seller.
In my area, on an existing Home the Seller will typically pay. But, on New const. it is typically the Buyer who will Have to pay. As, many Builders will refuse to pay for it...
Title ins. is also negotiable (in my area)
Hope this helps!