Both houses of the German parliament have now approved the contribution the country will make to a €750bn rescue package for the eurozone.
Germany is providing around a fifth of the package, which was agreed by EU members to prevent the Greek financial crisis spreading and to restore confidence in the single currency.
German Chancellor Angela Merkel has faced widespread domestic criticism for her support for the measures.
Ms Merkel said stabilising the euro had to be the priority for the EU.
The development came as EU finance ministers, including Brian Lenihan, attend a special meeting in Brussels.
Ministers are discussing tightening the bloc's budget discipline rules and improving economic policy co-ordination in the 16-nation eurozone.
They will lock horns under pressure from Germany to fix tough new cross-border budget controls.
Germany wants harsher sanctions on deficit sinners and an unprecedented insolvency procedure for states crippled by debt.
The talks are sensitive because some eurozone countries oppose a European Commission proposal to scrutinise member's budget plans before they are submitted to their own parliaments, seen as a threat to national sovereignty.
Summoned by EU President Herman Van Rompuy, the ministers are to come up with workable ideas to ensure the 27 national governments take greater shared responsibility for the EU's combined economy, the world's biggest trading bloc.
Some market analysts have speculated that failure to crack down adequately could break up the 16-nation eurozone.
Economic tension is already high despite French President Nicolas Sarkozy moving yesterday to deny a rift with Germany.
In Berlin, the tone remained sharp with Finance Minister Wolfgang Schaeuble defending a unilateral move to curb speculative trading by saying: 'If you want to drain a swamp, you don't ask the frogs what they think of the situation.'
'The markets are a whole mess of uncertainty and fear right now,' said Joshua Raymond of City Index in London.
International Monetary Fund head Dominique Strauss-Kahn has said there was no risk of the eurozone splintering but warned the crisis could cost Europe its credibility.
'The whole world is watching this... and is losing confidence in Europe,' he told French television late yesterday.
With the sovereign debt crisis threatening to unleash global economic chaos the way the banking crisis did in 2008, US Treasury Secretary Timothy Geithner will visit Britain and Germany next week for emergency talks.
In the US, the most sweeping overhaul of financial industry rules since the Great Depression of the 1930s is already under way with President Barack Obama pushing for closely-aligned changes in Europe.
