Argus Sour Crude Index
The Argus Sour Crude Index (ASCI) is an index published by Argus Media. The index was adopted by Saudi Aramco in October of 2009 to set prices for oil sold by Aramco in the U.S., in place of the West Texas Intermediate benchmark contract offered by the CME Group’s New York Mercantile Exchange. 
The oil tracked in the Argus index is delivered at the Gulf Coast, whereas the delivery point for NYMEX underlying oil is Cushing, Oklahoma.
- New Oil Price Benchmark Gathers Steam as Saudis Sign On. The Wall Street Journal.
- CME to Offer Argus Sour Oil Futures. Bloomberg.