The exchange rate stamp has a “legal basis”

The exchange stamp may be applied or not to balance the trade balance demotivating imports and promoting exports.

The truth is that the government took a major step if it needs to apply it: it promulgated Executive Order (943), which empowers the Board of Monetary Regulation to establish the means of payment for the cancellation of tariffs or taxes on foreign trade.

According to several analysts, adopting a ‘currency stamp,’ a Plus Tax Credit Certificate (CAT +), would be implemented through Central Bank Securities (TBC).

Source: http://expreso.ec/economia/el-timbre-cambiario-tiene-base-legal-CA211765