The $4 million payment was up from the less than $1 million that some vessels were paying to cut in line at the Panama Canal as recently as early March.
The intensifying standoff over the Strait of Hormuz has revived the push to open a safe shipping route for fertilizer and other goods to prevent a humanitarian crisis.
India is among the economies most exposed to the war in the Middle East, importing about 90% of its crude oil and more than half of its liquefied petroleum gas.
European allies are pushing to limit any financial benefit to Russian President Vladimir Putin, and Asian nations are grappling with energy shortages from the war with Iran.