Tinysponsor is the world's largest marketplace for sponsorships. A service offered on Tinysponsor is called a Package - think of it as buying and selling sponsored content the way you'd buy or sell anything else online.
For Sponsors - You can browse sponsorship types or use the search to find a Package you wish to purchase. Once you find a Package, read through the description and deliverables of the services offered and view the Creators work samples, if available. If you would like to make a purchase, just add it to cart, and proceed to checkout. You can pay for the service using a credit card.
For Creators - As a creator, you can offer services for Sponsors to purchase, the same way you'd offer an item on any ecommerce site (think Etsy). Creators set their own prices for the Packages that they offer on the platform. All Packages are free to post, but please note that Tinysponsor charges 15% marketplace fee + 2.9% credit card processing fee when your Package is purchased by a Sponsor.