The dollar plunged after data Tuesday showed a shock slump in the key US services sector, virtually wiping out any possibility of an interest rate hike this month.
The figures followed below-forecast readings on factory activity and jobs growth and sent investors fleeing the dollar, sending it tumbling against most other currencies -- making crude cheaper.
At about 0400 GMT, US benchmark West Texas Intermediate rose 31 cents to USD 45.14 and Brent crude was up 33 cents at USD 47.59.
On Tuesday Iranian President Hassan Rouhani said his country is committed to help stabilise the oil market after meeting OPEC chief Mohammad Sanusi Barkindo.
His comments came after OPEC kingpin Saudi Arabia and Russia said Sunday they would work together to boost the oil market, but stopped short of committing to a production freeze.
The vague remarks coming from officials have fuelled doubts that the Algiers gathering will end in a deal.
Oil has been dogged by a stubborn supply glut since late 2014, which saw prices dip to near 13-year lows below USD 30 earlier this year.
The previous attempt at reaching an output deal in April was scuppered by Iran's refusal to agree to any freeze as it emerges from years of nuclear-linked Western sanctions.
Official figures on US stockpiles are due for release on Thursday.
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