The firm said the US Department of Justice (DoJ) had launched a criminal investigation, while other regulators are running civil investigations.
It added that possible losses from all its the legal proceedings could total $5.9bn (Â£3.7bn).
A number of other banks, including HSBC, RBS and Barclays, have recently set aside sums to cover similar probes.
Global lenders, such as Citigroup and UBS, are also being investigated over the alleged rigging of foreign-exchange rates.
In a filing with the Securities and Exchange Commission (SEC) on Monday, JP Morgan said that it was co-operating with authorities, and currently engaged in discussions aimed at "resolving their respective investigations".
But, the firm added, "there is no assurance that such discussions will result in settlements".
As well as the criminal investigation by the DoJ, JP Morgan revealed it also faces civil investigations by the Commodity Futures Trading Commission (CFTC), the UK's Financial Conduct Authority (FCA) and "other foreign government authorities".
Last year, JP Morgan Chase agreed to a record $13bn settlement with US authorities for misleading investors during the housing crisis.

A team of archaeologists and volunteers has spent five years investigating the origins of 17 altars found at Maryport Roman fort in 1870.
Now the final phase of the Maryport Roman Temples project is under way.
Project director, professor Ian Haynes, said "so much depends" on the "last crucial season" of the dig.
Built on the cliffs overlooking Solway Firth, it is believed the fort was founded in the First Century AD when the Roman army initially entered the region.
The civilian settlement, which lies north-east of the fort, is believed to be the largest currently known along the Hadrian's Wall frontier.
The altars are housed at the Senhouse Museum Trust in Maryport and form part of a significant collection of Roman sculpture and inscriptions at the museum.
Believed to be the biggest single find of Roman inscriptions ever made in Britain, the altars provide evidence that three regiments from as far away as Spain and Germany were stationed at the fort.
In 2012, the team found another complete altar at the site.
Dated to the 2nd or 3rd Century AD, it was inscribed on behalf of Titus Attius Tutor, commander of the First Cohort of Baetasian, which came to Maryport from what is now the Netherlands.
Prof Haynes said: "We believe that we have located the general area where the altars once stood; in 2015 we will close in on the part of the site where we think that they were originally erected.
"By the end of the season we hope to have a detailed understanding of one of the most important Roman cult complexes ever to have been explored in Britain."
The final excavation ends on 14 August.
JP Morgan Chase, the largest bank in the US, has revealed it is under investigation over currency trading.
[NEXT_CONCEPT]
The final part of a Cumbrian excavation to unearth the history of what is believed to be the biggest ever find of Roman altars in Britain has begun.