FOREX-Dollar slips from near four-year high versus yen
* Dollar stalls just before 100 yen, euro before 130 yen
* Option barrier at 100 yen to act as hurdle
* Yen falls seen temporary after aggressive BOJ easing
By Wanfeng Zhou
NEW YORK, April 9 (Reuters) - The dollar edged down from a near four-year high against the yen on Tuesday as traders booked profits on its sharp rally, but the yen's weakening trend remained intact following the Bank of Japan's aggressive monetary easing plan announced last week.
Traders said option barriers at the psychologically important 100 level have slowed the yen's fall, but a break of that level looks inevitable after the BOJ pledged Thursday to inject about $1.4 trillion into the economy. The dollar has surged about 7 percent since then.
"Given the breadth of yen bearishness, any reprieve would likely encourage investors to re-establish short yen positions at more favorable exchange rates," said Joe Manimbo, senior market analyst at Western Union Business Solutions in Washington, D.C.
The dollar was last down 0.4 percent on the day at 98.93 yen , having earlier risen as far as 99.66 yen on Reuters data, its highest since May 2009.
Traders also cited strong demand to take profit on dollar gains before 99.73 yen, the 50 percent retracement of the dollar's fall from the June 2007 peak of 124.16 yen to a record low of 75.35 set in October 2011.
The euro hit 129.93 yen on Reuters data, its highest since January 2010, before stalling just shy of 130. It last traded down 0.1 percent at 129.17 yen.
Traders cited large stop-loss buy orders at 130 yen.
Japanese Finance Minister Taro Aso said on Tuesday that the yen was undergoing a correction from previous "excessive" rises, though he stressed the country's monetary policy was aimed at beating deflation, not weakening the yen.
Dollar/yen one-month risk reversals, a measure of the relative demand for bets on the dollar rising against the yen over bets on it falling, have risen to around 0.7 in favor of yen puts since the BOJ announcement.
With the dollar stalling ahead of the 100 yen mark, however, risk reversals have dropped back to around 0.5 in favor of yen puts. But analysts said this pause was temporary.
"Dollar/yen has moved so quickly it is bound to have setbacks ahead of key levels, so I am not surprised it is not just flying through the 100 mark," said Niels Christensen, currency strategist at Nordea in Copenhagen.
"(But) ... everything is pointing to a weaker yen and everyone is happy to go with the flow."
Against the dollar, the euro was up 0.4 percent at $1.3059, having hit a three-week high of $1.3073 earlier after stop-loss buying was triggered near $1.3050.
Concerns about the euro zone - the bailout for Cyprus, political uncertainty in Italy and Spain's struggling fiscal and economic conditions - seem to have taken a back seat for now, strategists said.
Rating's agency Moody's warned on Tuesday that prospects of Spain missing its public deficit target this year could result in its sovereign credit rating slipping below investment grade.
Higher-yielding commodity currencies, which tend to benefit when equities rise, hit multiyear highs against the yen.
The Australian dollar hit its highest since July 2008 at 103.83 yen and the New Zealand dollar rose to its highest since February 2008 at 84.49 yen.
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