O.P. is only Offering $15 for the Review and if O.P. will hire an escrow from the Link that you share, he needs to  pay  $28.59 just to make sure that the Transfer will be safe and Secured.

The escrow minimum Fee of the link that you shared is 0.001 in BTC.

it would be best if O.P. will send half of the amount of the reward to His chosen candidate while doing the review.