* Euro leaps more than a cent, short-covering takes it up
* Dollar down across board, DXY pierces 55-day MA
* Leveraged trades get a boost, Aussie and kiwi rally
By Charlotte Cooper
TOKYO, April 12 (Reuters) - The euro leapt to its highest in nearly a month on Monday, surging 1 percent on the dollar and yen as investors who had sold it scrambled to buy it back after euro zone finance ministers agreed a rescue package for Greece.
The euro's rise weighed broadly on the dollar, helping send the Australian dollar to its highest in five months and the New Zealand dollar to its strongest since late January, while the dollar index plunged through its 30- and 55-day moving averages.
Euro zone finance ministers approved a 30 billion euro ($40.5 billion) aid package of loans for Greece if needed, with 10 billion euros also expected from the International Monetary Fund, a move likely to calm markets in the short term. [
]The euro jumped as far as $1.3678 <EUR=> on trading platform EBS, up from $1.3488 in New York on Friday, before coming back to test support at its 55-day moving average at $1.3630. The euro, which hit a 10-month low at $1.3267 in March, is now seen as having potential to test a mid-March high near $1.3820 this week.
The agreement was likely to help Greece raise funds more easily but the problem was unlikely to disappear, said Robert Rennie, chief currency strategist at Westpac, Sydney.
"The way the market is short euro, this could give a leg up to around the next technical resistance at $1.3820. But can it sustain a move higher than that? I am not sure. We may see some selling emerge around there."
Scepticism about how Greece would resolve its debt problems has seen short positions stack up against the euro this year.
Data from the Commodity Futures Trading Commission shows currency speculators were still heavily short the euro in the week ended April 6, although they reduced their net short position to 67,223 contracts from a record 85,326 contracts the week before. [
]Andrew Robinson, FX market strategist at Saxo Bank in Singapore, said the euro may get squeezed higher again in European trade.
"Consolidation might take us just below $1.3600 but I see more upside for the rest of the week," he said.
The single currency rose above 127.00 yen <EURJPY=R> to test its 100-day moving average at 127.14 yen, although it was still below a peak seen early in the month at 127.95.
KNOCK-ON
Its gain underpinned broad risk appetite and pushed up commodity-linked currencies such as the Aussie and the kiwi.
The Aussie <AUD=D4> rose to its highest since mid-November at $0.9382, before coming back to $0.9340, still up 0.1 percent on the day, with its November peak of $0.9407 now in market sights.
The kiwi rose to $0.7195 <NZD=D4>, its highest level since late January, before relinquishing some ground to $0.7165.
The dollar index <.DXY> fell 1 percent to 80.33, breaking down through an upward trendline in place since early December and plunging through its 55-day moving average at 80.42.
The CFTC data shows currency speculators trimmed their long bets on the U.S. dollar in the week to April 6.
The yen, which as a low-yielding currency tends to suffer when appetite for riskier or higher growth currencies picks up, stood at 87.06 yen per Aussie <AUDJPY=R>, near a recent 18-month low. It was unchanged on the dollar at 93.18 yen <JPY=>, holding above a seven-month low near 95 yen set early this month.
One trader said there was sporadic dollar buying by Japanese importers but investors were hesitant to buy dollars for yen because they are wary of the possibility of China revaluing the yuan. There was talk of dollar loss-cutting sell orders at 92.80-70 yen and then down at 92.50.
Asian currencies, including the yen, are seen as likely to gain from any move by China to revalue its currency.
Chinese President Hu Jintao visits Washington this week for a nuclear security summit and is expected to hold a one-on-one meeting with U.S. President Barack Obama on Monday.
The currency market is watching closely for signs of how soon China might relax its grip on the yuan. The country recorded its first monthly trade deficit in six years in March, although economists doubt that will stand in the way of a resumption in the yuan's rise before long. [
] (Additional reporting by Anirban Nag in Sydney and Kaori Kaneko in Tokyo; Editing by Joseph Radford)