Point your camera at a physical Mudwater card, see card details including market value.
Fill the frame with one card and tap the shutter. The number and name are read off the card’s bottom plate; the photo is used for that and not kept. Prices and sales are the same ones the card pages show. Base is shown first; tap Foil if your card is a foil.
If the camera won’t open (a wallet app’s browser, for one), use the photo button or open mudwatercards.com/scan in Safari or Chrome.