A contract of guaranty which is used to secure commercial transactions. In Islamic jurisprudence, there is a host of shari’a-compatible contracts of guaranty that are similar in essence to modern bank guaranties including: market guaranties, dhaman al-darak (dhaman al-uhdah), guaranties against defective tools of measurement (size, weight, volume, etc). The Islamic commercial guaranties are noncommutative, i.e., they are provided free of charge for charity purposes, as opposed to conventional bank guaranties which are ribawi in nature.