Now add marginal deposits and loans

Mentalmarket looks like any other website with classified ads, but all of its items are priced in cryptocurrency. The platform supports payments in major coins such as bitcoin core (BTC), bitcoin cash (BCH), ether (ETH), litecoin (LTC), zcash (ZEC), Ripple’s XRP and dash. Prices are also displayed in U.S. dollars for convenience.The marketplace has been gaining popularity among Russian crypto enthusiasts with a growing assortment of products and services. Users can buy almost anything — from mining hardware and bitcoin ATM devices to plots of land around Moscow and a hotel in Sochi. A farmer from Tashkent even sells sheep at 0.074 BTC a head.

You have customers buying stuff.  The next service must be an S&L capability to balance buyers and sellers.  Offer marginal lending contracts to preferred customers, let your auto price balance the interest flow from lender to depositor.  Dump some of the more useless currencies.  his will work if you have transport support to back it up.  Arbitrary product delivery times will kill the project.