One agency might use flat-rate monthly retainers, while another charges project-based fees per campaign. Some set a percentage of the total marketing spend, others combine flat fees with performance bonuses. Pricing may also vary based on influencer tiers (nano, micro, macro, celebrity). Transparent agencies will present multiple models and suggest which fits your business best. https://bizistech.com/transparent-amazon-agency-pricing-from-a-leading-influencer-marketing-agency/