Oil Price Information Service (OPIS) is a price reporting agency which provides information that is used for commercial contracts and trade settlement related to petroleum, gasoline, diesel, ethanol, biodiesel, LP-gas, jet fuel, crude, natural gas, petrochemicals, recycled plastics, refinery feedstocks, residual fuel, and kerosene. It is based in Rockville, Maryland and has offices in New Jersey, Houston, Texas, Minnesota, and internationally in Sweden, Romania, Singapore, and Japan.