Data providers played a third-party blame game after several sources erroneously showed a sharp spike lower for China's currency late Monday U.S. time.
The inaccurate data came just as U.S. President-elect Donald Trump used a Twitter tweet-storm to rail against China for allegedly deliberately weakening its currency.
Some currency data providers were showing late Monday U.S. time that the yuan tumbled, with the dollar fetching as much as 7.49 yuan in overnight trade. That would have been an 8.8 percent rise for the currency pair from the onshore close of 6.8830, according to Reuters data.
Neither Reuters nor Bloomberg data showed the spike. China's central bank did not respond to a faxed inquiry from CNBC.
But the data providers showing the blip pointed to unnamed "third parties" for the error.
ICAP, one of the sources posting the erroneous figures, said in a statement on Tuesday that the data was derived from both internal sources and "several third party feeds."
"ICAP has corrected the price and removed the third party from its feed," the statement said, without naming the third party. ICAP declined to comment further on the third party's identity.
Another data provider, XE, also pointed higher in the data food chain.
"We have a wide array of upstream data sources, several of which provided rates which our algorithms interpreted as a genuine movement in the CNY (Chinese yuan). We have confirmed with our upstream providers that these were inaccurate and have adjusted our rates accordingly," XE said.