Multicommodity standard at least still allows convenient pricing in valuns. In some usages, a multicommodity standard with enough commodities in it already counts as a system without a monetary base. Imagine if all of the base money in the world disappeared. Risk of systemic shortages and surpluses if relative scarcities fluctuate. Real bonds systems.
People use real bonds or other securities as money.
But these are never net wealth, so trade exists without any base money. Prices could still be quoted in dollars or e.g. 1987 dollars, but everyone pays for real goods by issuing interest-bearing bonds or other securities. At the maturity time, the issuer has to pay the value in present goods. In a free market, all means of payment would earn interest. Clear advantage over single commodity standards in terms of purchasing-power stability, vulnerability to runs, etc.