The Business Model of SEO Agencies look SEO agencies can operate under various business models, such as monthly retainers, project-based fees, or performance-based arrangements. Some agencies prefer a flat monthly fee covering a specific set of services—ideal for ongoing optimization and gradual improvements. Others charge by the project, focusing on defined deliverables like a website audit or a short-term link-building campaign. Meanwhile, performance-based models tie payment to predetermined milestones, such as achieving a particular keyword ranking. Whichever model an agency adopts, the key is to provide consistent value, foster trust, and adapt strategies as search engine algorithms evolve.