It is quite known among people who provide seo services or might need them that seo is not a one time investment. It needs constant attention and upgrading. Content marketing needs to be updated according to marketing trends and keywords also need to change according to what customers are looking for each passing day. In the US, seo services can cost about 200 dollars an hour. On average, seo services can cost 2000-10000 dollars per month in the US. However, there are also businesses that are not very established and might not need heavy marketing so for them it can range from 700-2500 dollars per month. Some businesses also prefer to give a one time cost for an agency’s services.