Emerging Asian currencies led by the Korean won and the  Philippine peso hit new highs on Wednesday as concerns over the global economy  eased after strong U..S. corporate earnings and a credit ratings affirmation  for Spain.
Traders said the potential for further gains was limited,  with central banks seen as stepping into the market to stem the rise of the  currencies, which make exports more expensive.
The South Korean won hit a one-year high, while the Taiwan  dollar climbed a five-month peak on inflows from foreign financial inflows. 
The Philippine peso reached its highest in more than five  and half years, but it gave up some of the gains after the central bank was  spotted buying dollars, traders said.
The Singapore dollar barely moved on similar intervention  by the authority, dealers said.
Asian stocks also rose on Wednesday, boosted by Moody's  decision to retain Spain's investment grade rating, assuaging widespread fears  that it would be cut to junk status.
Strong earnings from US firms also improved risk appetite.
"The positive sentiment appears to be sustained,"  said Frances Cheung, senior strategist at Credit Agricole CIB in Hong Kong.
"However, Asian policy makers may not want to see  their currencies too strong. I expect them to jump into the market trying to  cap currency strength," she added.
Emerging Asian countries heavily rely on exports and the  recent slowing global economy, especially China, has kept investors from  chasing regional assets including currencies.
The risk sentiment is likely to depend on China's  third-quarter growth due on Thursday.
Still, Credit Agricole's Cheung said slowing growth in the  world's second-largest economy may not much deter a firm trend in emerging  Asian currencies.
"There could be downside risk from China GDP, but the  data may not be very worrying, given China's recent yuan-fixing," Cheung  said.
The People's Bank of China has been fixing the yuan's  mid-point firmer, helping the currency hit record highs, even though its  economy has cooled.
TAIWAN DOLLAR
The Taiwan dollar strengthened to 29.142 to the US dollar,  its highest since May 2 on inflows from foreign financial institutions.
Its upside was limited as the island's importers including  oil companies bought greenbacks, dealers said.
The central bank was spotted intervening to stem the Taiwan  dollar's strength, but its US dollar bids were not that strong, they added.
KOREAN WON
The won advanced for a fifth consecutive session to hit  1,103.3 per dollar, its strongest since Oct. 31.
The South Korean currency is seen heading to the previous  peak of 1,100, given improving risk appetite, but investors stayed cautious  over possible dollar-buying intervention by the foreign exchange authorities.
Importers bought dollars for payments on dips, while some  offshore funds took profits.
"We may see the 1,100. But not that soon. Exporters  are not active enough to push the won there," said a foreign bank dealer  in Seoul.
PHILIPPINE PESO (₱)
The Philippine peso jumped to ₱41.160  to the dollar, its strongest since March 2008, on remittance inflows and solid  economic fundamentals.
The peso found some resistance as the central bank was  spotted buying greenbacks below 41.20, prompting offshore funds and interbank  speculators to chase dollars, dealers said.
But some dealers saw the peso's retreat as opportunities to  buy the local unit on dips.
"Market sentiment is still to sell the dollar on rallies.  So any bounce to 41.30 would be a chance to either reinstate or add on to  short-dollar positions," said a foreign bank dealer in Manila.
RINGGIT
The ringgit hit 3.0390 per dollar, its firmest since Sept.  14, as interbank speculators chased the local currency, tracking a firm euro  and other risky assets.
Still, the Malaysian unit could not extend gains as the  Singapore dollar was capped by spotted intervention.
SINGAPORE DOLLAR
The Singapore dollar barely changed as the central bank was  spotted buying US dollar to stem the local unit's strength, dealers said.
Agent banks of the Monetary Authority of Singapore were  seen preventing the city-state's currency from strengthening past 1.2180 to the  greenback, according to dealers.
The intervention came as Singapore reported a surprise drop  in non-oil domestic exports in September, disappointing market expectations of  a slight growth.
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