The eurodollar market made it possible to borrow and lend US dollars through banks outside the United States. Its importance to currency trading comes from that separation: the currency was American, but the deposit, loan and banking relationship could sit elsewhere.
Within the history of forex trading, this is the funding side of the story. Buying dollars is one transaction; obtaining dollars for three months to finance trade is another. Offshore banking connected the two, bringing currency dealing, international lending and bank funding into closer contact.
What Is a Eurodollar?
In its conventional meaning, a eurodollar is a dollar deposit held at a bank outside the United States. The bank’s nationality does not decide the classification. A dollar deposit at the London branch of an American bank qualifies; a dollar deposit at the New York branch of a French bank does not. The distinction concerns the location accepting the deposit, not the depositor’s passport, as set out in the BIS study of London’s eurodollar market.
The name does not mean euros converted into dollars. Nor does it restrict the market to Europe. A conventional dollar deposit in Singapore can be a eurodollar deposit too. Financial terminology is not always a reliable geography teacher.
Three distinctions help keep the subject straight:
- Eurodollar deposits are bank liabilities denominated in US dollars.
- EUR/USD is an exchange rate between two currencies.
- Eurodollar futures were interest rate contracts, not contracts on the euro’s exchange rate.
“Offshore” here describes a banking location relative to the currency’s home country. It does not, by itself, mean secrecy, tax evasion or an illegal transaction.
The Origins: London in the 1950s
The eurodollar market did not emerge from one clearly identifiable opening trade. Accounts often emphasize Soviet concerns about holding dollars in American banks. That political explanation belongs in the history, but it does not adequately explain the commercial development of the market.
Archival research identifies dollar deposit activity at Midland Bank in London in 1955. The bank could attract dollar funding, exchange it into sterling and arrange a forward transaction to cover the later conversion back into dollars. The attraction was a potential return after allowing for the cost of that exchange cover. These transactions predated the sterling restrictions frequently credited with starting the market, as documented in Catherine Schenk’s research on the market’s origins from 1955 to 1963.
In 1957, British restrictions on sterling financing for trade between foreign parties gave banks another reason to use dollars. Those measures encouraged an existing practice rather than creating it from nothing.
The distinction matters. The market grew through a combination of customer demand, differences in interest rates and regulatory opportunities. Treating it solely as a Cold War workaround misses the banking economics that made it expand.
Why Offshore Dollar Banking Expanded
During the 1960s, differences between domestic and offshore banking rules gave dollar deposits outside the United States a commercial advantage. US deposit interest ceilings, reserve requirements and other funding costs could make domestic deposits less attractive than offshore alternatives.
When domestic deposit ceilings became restrictive in 1966, large American banks used their London offices to replace funding lost at home. Offshore banking was therefore not simply foreign banks competing against American banks. American institutions participated through their own overseas operations. This pattern is documented in the BIS history of international banking and regulatory arbitrage.
The underlying incentive was straightforward: if a bank could obtain funds more cheaply, it had room to offer a better deposit rate, charge borrowers less, or retain a larger margin. Competition determined how those benefits were divided.
Regulatory arbitrage meant arranging business around differences between rulebooks. It did not mean that every offshore transaction took place beyond all supervision. Nor should the funding advantages of the 1960s be treated as a description of banking rules today.
This history complements the broader subject of exchange controls and parallel currency markets. Restrictions can change the currency, location or contractual form of a transaction without removing the underlying demand for financing.
How a Eurodollar Transaction Worked
The eurodollar market dealt in bank claims, not crates of dollar notes shipped across the Atlantic. A depositor held a claim on a bank, and banks transferred or lent funds through accounts with other institutions.
Offshore dollar transfers also remained connected to American banking. Moving a deposit between overseas banks could require corresponding entries through banks in the United States. The Richmond Fed’s account of eurodollar settlement illustrates how overseas transactions connected with US correspondent accounts and reserve transfers.
A Simplified Funding Example
Suppose an exporter places $5 million with a London bank for three months. The bank lends $4 million to an importer for the same period and retains the remaining $1 million in liquid dollar assets. Ignore capital requirements, fees and other balance sheet positions for this illustration.
| Transaction | Bank’s obligation or asset | Practical meaning |
|---|---|---|
| Exporter deposits $5 million | $5 million deposit liability | The bank owes the exporter dollars at maturity. |
| Bank lends $4 million | $4 million loan asset | The importer owes the bank principal and interest. |
| Bank retains $1 million | Liquid dollar assets | The bank has funds available for payments. |
If the importer pays late, the exporter’s deposit still matures on schedule. The bank must find replacement dollars or use other available assets. Matching the currency of assets and liabilities does not eliminate the risk that payments arrive at different times.
This example also shows why an offshore deposit is not interchangeable with a Federal Reserve balance. It is a promise by a commercial bank to pay dollars, with the risks that such a promise carries.
How Offshore Funding Connects With Currency Trading
The most useful way to see the connection is through a business payment. A company can need dollars without wanting to speculate on the dollar. It might simply have an invoice due before its customer pays.
Funding a Dollar Invoice
Consider a hypothetical European importer that owes a supplier $2 million today and expects to receive $2 million from a customer in 90 days. A 90-day dollar loan bridges that gap. If the expected receipt arrives in full, the company can repay the principal without converting its operating currency into dollars.
Change one assumption and the risk changes. If the customer will pay in euros rather than dollars, the importer has a currency mismatch. It can arrange a forward purchase of dollars to cover the loan repayment, but must include the forward price and borrowing cost in its budget. A low loan rate alone does not establish that dollar borrowing is cheaper.
Obtaining Dollars Through an FX Swap
A bank with euros available can also obtain dollars through an FX swap. It exchanges euros for dollars now and agrees to reverse the exchange at a future date at an agreed rate. Economically, this provides temporary access to dollars against another currency.
Compare two hypothetical offers for the same amount and maturity: a direct dollar loan costing $25,000, and an FX swap whose all-in funding cost is $30,000. Subject to credit terms, collateral and transaction costs, the direct loan is cheaper by $5,000. The decision requires a funding comparison, not a forecast that EUR/USD will rise or fall.
These examples show why offshore currency trading cannot be reduced to spot exchange rates. A treasury desk must consider the currency required, the payment date and the cost of carrying the position until then. Access to dollars and the price of dollars are related questions, but they are not the same question.
Petrodollar Recycling and International Lending
The oil shocks of the 1970s created large surpluses for oil exporters and financing pressures for many importing countries. Banks intermediated between the two, accepting funds from surplus countries and extending loans to borrowers, including governments in Latin America.
This process became known as petrodollar recycling. A petrodollar describes dollar revenue associated with oil; a eurodollar describes an offshore bank deposit. An oil exporter’s dollar deposit outside the United States could fit both descriptions.
The arrangement became more difficult as monetary tightening raised interest rates and recession weakened borrowers. In August 1982, Mexico informed US and international officials that it could no longer service its debt. The sequence from oil surpluses to bank lending and repayment trouble is covered in the Federal Reserve’s history of the Latin American debt crisis.
The lesson is not that offshore deposits caused every subsequent debt problem. It is that a market capable of moving savings across borders can also transmit losses across borders. For lenders, having funds available to lend is not evidence that a borrower can repay them.
Dollar Funding Risk and the Financial Crisis
Return to the hypothetical London bank, but extend its importer loan to three years while leaving the exporter’s deposit at three months. The bank must repeatedly replace its funding. Even if the loan remains sound, a refusal by depositors to renew can create an immediate cash problem.
There are two different questions: will the borrower repay eventually, and can the bank meet payments today? A favorable answer to the first does not guarantee the second.
During the 2007–2008 financial crisis, strains in dollar funding markets prompted the Federal Reserve to establish temporary swap arrangements with foreign central banks. Those central banks obtained dollars and lent them to institutions in their jurisdictions. The Federal Reserve’s record of crisis-era liquidity swaps sets out the structure and the foreign central banks’ responsibility for their own lending decisions.
The implication is straightforward: booking a dollar liability outside the United States does not remove the need to obtain dollars when it falls due. Offshore banking changes where obligations are recorded, not the currency in which they must be settled.
Eurodollar Futures Were Interest Rate Contracts
The deposit market also gave its name to an exchange-traded derivative. CME launched eurodollar futures in 1981. The contracts tracked three-month dollar LIBOR and settled in cash rather than through delivery of a deposit, as recorded in CME’s historical description of eurodollar futures.
The distinction from currency futures is fundamental. Eurodollar futures addressed dollar interest rate exposure. Currency futures addressed the value of one currency against another. Their shared use of the word “dollar” did not make them substitutes.
A company could therefore face both risks at once: a changing interest bill on a floating rate dollar loan and a changing home-currency cost of repaying that loan. Managing one exposure would not automatically manage the other. The separate history of the origins of currency futures covers the exchange rate side.
From LIBOR to SOFR
LIBOR’s role weakened as the transactions supporting it became sparse and reliance on bank estimates created vulnerability to manipulation. SOFR offered a different foundation: observed overnight borrowing secured by US Treasury securities. The New York Fed’s explanation of LIBOR and SOFR describes why the industry pursued that change.
The difference was economic, not just a new acronym. Unsecured bank borrowing includes exposure to the bank’s creditworthiness. Treasury-backed overnight financing measures a different transaction. Replacing one reference rate with the other therefore required contractual adjustments rather than simply changing a label.
In April 2023, CME converted eligible eurodollar futures and options positions into corresponding SOFR contracts. The remaining May and June contracts were excluded and left to expire, as detailed in CME’s announcement of the completed SOFR conversion.
That transition ended the old futures framework, not the economic activity represented by offshore dollar banking. A benchmark measures borrowing costs; it is not the deposit or loan itself.
The Eurodollar Market’s Lasting Importance
The central lesson is to separate three things: the currency of an obligation, the location where it is booked and the institution responsible for paying it. Those details can point to different countries without changing the amount due.
For currency-market analysis, this adds a necessary question to “Where is the dollar heading?”: “Who needs dollars, when do they need them, and on what terms can they obtain them?” The eurodollar market’s history shows why an exchange rate alone cannot answer that.