Selling links allows you to earn even sites without traffic. The cost is influenced by many factors: TCI, PR, resource availability in catalogs, age, etc. Most of the links are sold on special exchanges.
Make a smart proposal first. Look at the prices set by competitors, evaluate the technical characteristics of your resource and write high-quality, attractive text. You can contact copywriters who, for a certain fee, will make you a tempting offer.
Register on the forums of webmasters, seo-optimizers and moneymakers. Almost all of them have a section "buying and selling links". Your task is to create a topic, post your proposal there, and also view neighboring topics. Perhaps someone wants to buy a link from a resource whose criteria match yours. This is the longest but easiest option for selling links.
Selling eternal links
Register on the perpetual link exchanges (GoGetLinks, GetGoodLinks, etc.). Add your site and wait for the approval of the moderator. Read the rules of the resource carefully. Perhaps there are some pitfalls. It should be remembered that by posting perpetual links, you are making a commitment that they will last as long as the resource exists. Otherwise, your account may be blocked.
After the site has been moderated, you can start making money. Place an offer first. The system will analyze your site and offer an average price, but you do not have to agree with it. You can indicate your amount, and then experiment with the cost, choosing the most optimal option.
Submit an offer by the advertiser yourself. Depending on the exchange, the procedure may differ. Read the terms of placement carefully. Some webmasters require you to link only in new posts, others prefer only old ones. There can be many nuances, but if you want to be successful in selling links, they cannot be ignored.
Selling temporary links
This method is easier than the previous one, but the earnings are less. For example, an eternal link can cost 51 rubles, and a temporary link 3 rubles per month. It is easy to calculate that at least 17 months must pass for a full redemption. Moreover, it is not a fact that the advertiser will want to leave a link for this period.
Register on exchanges (sape, trustlink and others), add a platform and place a special code on the resource pages. Then you only need to approve or reject the proposals. They will automatically be placed on the pages without you having to do anything else. The more TCI, PR and indexed pages a site has, the more profit will be.