Help


Frequenty Asked Questions

How do I search?

Type in a description of the collectible you’re pricing. The more specific your search, the more accurate the results will be. If you aren’t getting many listings, try broadening your search terms. For cards, a good baseline is the year, player name, and card manufacturer. Initially, we give you our best estimate of current market worth. To get a more specific price, use the checkboxes to select items most similar to yours to get the average price of your collectible!

What can I search for?

Just about anything that's sold on eBay. Mavin will tell you what it's worth based on recently sold comparable items. Below is a list of the categories we offer:

  • Antiques
  • Art
  • Baby
  • Books
  • Business & Industrial
  • Cameras & Photo
  • Cell Phones & Accessories
  • Clothing, Shoes & Accessories
  • Coins & Paper Money
  • Collectibles
  • Computers/Tablets & Networking
  • Consumer Electronics
  • Crafts
  • Dolls & Bears
  • DVDs & Movies
  • eBay Motors
  • Entertainment Memorabilia
  • Health & Beauty
  • Home & Garden
  • Jewelry & Watches
  • Music
  • Musical Instruments & Gear
  • Pet Supplies
  • Pottery & Glass
  • Real Estate
  • Specialty Services
  • Sporting Goods
  • Sports Mem, Cards & Fan Shop
  • Stamps
  • Tickets & Experiences
  • Toys & Hobbies
  • Travel
  • Video Games & Consoles
How do you calculate the worth?

When you search for something on Mavin, we give you our best estimate of market worth. Our algorithm uses items that have been sold in the past and then filters out the junk.

What data are you using to generate worth?

We’re currently utilizing real-time market data from eBay, but we’re working to improve our database of comparable by building the next generation of Mavin that will utilize data from multiple sources.

What if my search doesn't return any results?

You may not be searching the right way. Mavin has data on everything that is bought and sold on eBay. You have to search the same way you'd search eBay. If you include too many details in your search it will limit the number of results. Try broadening your search by entering fewer details.

What if I get too many results that aren't like mine?

Include more details about your item. Look at the results and see what details people include when listing items like yours. Include more details in your search until you get results that match your item.

Can I sell my stuff on Mavin?

Yes! You must have an account to save and sell your stuff. When you go to save your item, or edit an item in your collection, you'll have the option to mark the item "For sale". There are no listings fees, and you can list as many items as you want!

What currency are your prices in?

Currently all of our prices are in $USD, but we have plans to support other currencies and languages.

How do I export my collection?

You can export your collection on a collection page ("My Baseball Collection"), using the download icon/link on the upper right of the page.


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Made in
Ann Arbor