The report was based on data from a survey of 357 SEO agencies, consultants, and freelancers. Three-quarters of respondents say they charge clients a monthly retainer fee. Some 59% SEO specialists offer only one pricing model, and 67% of that group charge a monthly retainer. In other words, 40% of all respondents only charge a monthly retainer and do not offer hourly or per-project pricing to clients. The researchers found that $501-$1,000 per month is the most popular monthly retainer rate for SEO specialists, with 23% of respondents charging that rate. Get the full story at Ahrefs