Does Midpoint track my collection's value?

Yes. Every card you save that has been identified gets a market value, and the Portfolio tab shows the total collection value with a value-weighted 30-day change, refreshed automatically every day from eBay sold-listing data. It goes well beyond a number: record what you paid to see gain/loss per card, mark cards sold to build a realized profit/loss ledger, file cards into binders, track grading submissions, set price alerts, export to CSV, and display values in your own currency. All of it syncs between the mobile app and the web.