European Union finance ministers have agreed on emergency measures worth 500 billion euros to stop the Greek debt crisis from spreading to other countries.
The 16 members of the single currency bloc will have access to 440 billion euros of loan guarantees and 60 billion euros of emergency European Commission funding.
The International Monetary Fund will also contribute up to 250 billion euros.
World stock markets and the euro soared after the biggest international intervention since the banking crisis of 2008 was agreed in all-night talks in Brussels.
London's FTSE-100 opened more than 3% higher on Monday, while the troubled Athens exchange gained more than 7%.
The BBC reports there had been fears that without the measures, the euro might have come under pressure on markets as investors grew concerned about financially-troubled states such as Portugal and Spain.
The euro strengthened in early trading on Monday, surging above $US1.30, after hitting a 14-month low last week.
This followed a rise in Asian stock markets, with the Japan's Nikkei index up 1.6%, Hong Kong's Hang Seng index up 2.54%, while Australian stocks rebounded by 2.6%.
In New Zealand, the benchmark index was 0.3% higher at the close.
On Friday, eurozone leaders approved an 110 billion euro loan package to Greece, which will be backed by the EU and IMF.
