On Monday, US President Donald Trump threatened to take out Iran "in one night" if it failed to make a deal reopen the Strait of Hormuz by 20:00EDT (00:00GMT) on Tuesday.
But even before his latest threat some countries had already secured deals with Tehran for their vessels to use the key shipping route.
Asian nations - most recently the Philippines - have been particularly keen to reach agreements as their economies are heavily reliant on energy from the Gulf.
The critical route has become a global flashpoint after Tehran retaliated to US and Israeli airstrikes by threatening to attack ships in the strait.
Oil prices have surged since the disruption to shipping in the narrow waterway, through which a fifth of the world's energy shipments usually transits.
