Vertex
a crystalline mineral mined on the planet Kir, vertex was used as the standard for most financial transactions of the Old Republic, and became a supplement to Authority Cash Vouchers when the Corporate Sector Authority was formed. When a being needed to exchange credit at an Authority Currency Exchange, they were given either a Voucher or vertex crystals at the going rate. The crystals that were mined on Kir were refined to a standard size and color, helping to stabilize their value as currency.