In their March 2018 paper entitled «Pairs Trading, Technical Analysis and
Data Snooping: Mean Reversion vs Momentum», Ioannis Psaradellis, Jason Laws, Athanasios Pantelous and Georgios Sermpinis test a variety of technical trading rules for long - short trading of 15 commodity futures, equity indexes and
currency pairs (all versus the U.S. dollar) frequently used on trading
websites or offered by financial market firms.
According to the
data published on the official
website of U.S. Patent and Trademark Office (USPTO), PayPal applied to register the patent for an «Expedited Virtual
Currency Transaction System.»