There are some pricing systems on professional SEO consulting. Some of them are:
Pay Per Hour: The payment system where the SEO company is paid per hour of labor.
Pay Per Month: The payment system where the SEO company is paid a fixed amount per month.
Pay Per Performance: This payment method is also called as Pay Per Result. Performance values which are used mostly are unique visitor and absolute sale. Different payment boards can be arranged according to the performance values. According to the SEO company, one-time payment before the SEO service may be included.
Pay Per Ranking: The payment system where the SEO company is paid a monthly amount per keyword which is listed on Google 1st page organic results. The montly amount varies according to its first page ranking. One-time payment before the SEO service may be included.
Pay Per Project: The payment system where the SEO company is paid a fixed amount for the whole SEO project. This fixed amount can be paid at once or in instalments.