₹750-₹5000 monthly. The amount a client pays falls within this range and is influenced by the size of their company and the scope of services offered by the agency. Small SEO firms with a constrained menu of services are at the lower end of this spectrum. Businesses with bigger needs who deal with full-service SEO services fall into the upper bracket. A monthly retainer typically costs ₹2,500 to ₹5,000 for businesses.