You’re right. Guide is free for merchants! Because Shopify has a closed-cart system, the total revenue made by each sale sent to the merchant is unable to be split among different parties. In order for us to receive the amount that our mutual customers pay for Guide Shipping Protection, we send a usage charge through Shopify for each order that adds Guide. The charges on your statement are for the exact amount of the total protection fees. This amount is shown on your monthly statement so there are no suprises.