linkr charges a monthly platform usage fee that you can cancel on a monthly basis. Subject to your chosen plan, you have different features included and can work with as many influencers as you like through the platform. You can up or downgrade your plan at any point in time. See pricing here.
How you would like to compensate influencers for their work is separate from that. linkr allows you to set up and execute a broad variety of compensation types like product sample only campaigns, sales-commission influencer campaigns, bidding campaigns as well as fixed price campaigns. Choose the influencer compensation that suits your needs best!