A set of detailed international rules governing documentary Ietters of credit (known as letters of credit in English law and commercial letters of credit in US law). Developed by the International Chamber of Commerce (ICC) and first issued in 1933, they are periodically revised and updated to reflect the experience of international letter of credit practitioners. The current version of the UCP, published in 2007, is ICC Publication No. 600, commonly referred to as UCP 600. The UCP does not have force of law, but must be incorporated by express reference in a letter of credit.

For more information on the UCP and UCP 600 from the point of view of English law, see Practice notes, Letters of credit: overview and UCP 600 and, from the point of view of US law, see Practice Notes, Commercial Letters of Credit: UCP 600.

The ICC has also issued the Supplement to the Uniform Customs and Practice for Documentary Credits for Electronic Presentation (eUCP) to apply to letter of credit transactions that involve one or more electronic documents. The eUCP automatically incorporates all the terms of UCP 600. If a letter of credit states that it is subject to the eUCP, it is also subject to UCP 600. Like the UCP, the eUCP must be incorporated by express reference in the letter of credit.

For more information on the eUCP from the point of view of English law, see Practice note, Letters of credit: overview: Summary of eUCP provisions and, from the point of view of US law, see Practice Note, Commercial Letters of Credit: eUCP.