After retrieving Golden Claw from Bleak falls, You should bring the Golden Claw to Lucan, he is the trader in the Riverwood. You will know about the owner of Golden Claw from Arvel's Journal book.


Skyrim Golden Claw Reward
 Arvel's Journal Book

You should start the conversation with Lucan and he speaks about the Golden Claw. Upon giving Golden Claw to the Lucan, He will give 400 gold to you as Reward.

Skyrim Golden Claw Owner

Read more about Golden Claw and related Quest Here