The ECB said the monthly pace of its net asset purchases would be halved to 15 billion euros from September until the end of December 2018, at which point purchases would end.
Gold prices are trading lower early Friday, putting it in a position to close lower for the week.
The common currency shed 1.9% to the dollar after the rate comments, in its sharpest daily fall in the nearly two years since the Brexit vote shock in 2016.
Another event markets were gearing up for: the start of soccer's World Cup in Russian Federation, where time zone differences mean there will be more matches during European or US and Latin American trading hours than any previous tournament.
California three-state plan faces major legal, political hurdles
Though it isn't likely to get voter approval, it would still have to clear numerous hurdles, including getting approval from U.S. It would be the first division of an existing US state since the creation of West Virginia in 1863.
The European Central Bank announced on Thursday that it will bring to an end the €2.5 trillion (more than R31 trillion) bond buying programme it has undertaken since the eurozone debt crisis.
The euro was headed for its worst weekly loss in 19 months after the European Central Bank signalled on Thursday that it would keep interest rates at record lows into at least mid-2019, even as it pledged to end its massive bond purchase scheme by the end of this year.
Euro Zone bond investors responded immediately to the dovish response by the European Central Bank, cutting the chance of a 10 basis point rate hike by July 2019 from 80 percent before the meeting to just 30 percent by the close of the session.
U.S. President Donald Trump is due to unveil revisions to his initial tariff list targeting $50 billion of Chinese goods, and focus was on whether the revisions would ease or further fuel trade tensions. After a two-day meeting, the BoJ said it would retain its current framework, pointing to a disappointing lack of progress towards its longstanding 2.0 percent inflation target.
"These opposing views should see interest rates diverging more between the two most powerful central banks in the US's favour which should continue to lend support to the dollar".
Isolated Kim takes big gamble leaving home for Trump summit
The talks will take place at the Capella Hotel on the island of Sentosa, a small resort island off Singapore's southern coast. It initially was meant to rid the North of its weapons, to forge the " complete denuclearization " of the country.
The Dow Jones Industrial Average fell 7.94 points, or 0.03 percent, to 25,193.26, the S&P 500 gained 7.6 points, or 0.27 percent, to 2,783.23 and the Nasdaq Composite added 62.69 points, or 0.81 percent, to 7,758.39.
There is also mounting concern over political upheaval in Italy, higher oil prices and the threat of a trade war with the US.
The BOJ's inaction came after the U.S. Federal Reserve decided Wednesday to raise interest rates.
OIL: Benchmark U.S. crude lost 20 cents to $66.69 per barrel in electronic trading on the New York Mercantile Exchange.
United States continues to monitor ZTE for violations: Wilbur Ross
ZTE will also provide access to a team for a period of 10 years to monitor the company's compliance with US export control laws. US Commerce Secretary Wilbur Ross defended the new agreement, saying in a statement: "We will closely monitor ZTE's behavior".