Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs.
27. Sponsored/paid posts – Many blogs publish sponsored and paid posts. Sponsored posts are basically just posts about a specific brand, product or service. A company will pay you to publish an article about it. It’s similar with other paid posts as well. Your basically selling the spot for the article on your site. If you decide to take this route, you’ll want to build your traffic before you will get many offers.