American Financial Exchange (AFX)

What Is the American Financial Exchange?

The American Financial Exchange, or AFX, was an electronic marketplace focused on unsecured interbank lending among U.S. financial institutions, especially smaller and regional banks. It was closely associated with AMERIBOR, a credit-sensitive benchmark based on transactions in that market.

AFX matters because it was part of the post-LIBOR benchmark debate. While SOFR became the dominant U.S. dollar replacement rate, AFX and AMERIBOR represented the argument that some banks wanted a rate reflecting bank credit and unsecured funding costs.

How AFX Fit Into Bank Funding

Banks borrow and lend to manage liquidity, funding needs, and balance sheet positions. AFX created a marketplace where participating institutions could transact in unsecured funding. Those transactions were then used to support AMERIBOR benchmark calculations.

The design was different from SOFR, which is based on secured overnight Treasury repo transactions. AFX's benchmark logic focused on bank credit-sensitive funding rather than a nearly risk-free secured rate.

Why It Became Important

When LIBOR was being phased out, borrowers, lenders, and regulators had to choose replacement rates for loans, derivatives, and other contracts. Many large markets moved toward SOFR. Some smaller and regional banks argued that a credit-sensitive rate could better match their funding economics.

AFX sat inside that debate. It was not simply a trading venue; it was part of a larger question about how floating-rate contracts should price bank credit risk after LIBOR.

Current Benchmark Context

In January 2025, ICE announced it had acquired AFX and would transition AMERIBOR administration to ICE Data Indices. In June 2025, ICE Benchmark Administration announced a cessation date for ICE AMERIBOR settings after June 30, 2025.

That status changes how the term should be read. New contracts are unlikely to treat AFX or AMERIBOR the same way older LIBOR-transition documents did. Existing documents should be reviewed for successor-rate and fallback provisions.

What to Watch in Contracts

For a loan, swap, or floating-rate instrument referencing AMERIBOR, the important details are the replacement benchmark, spread adjustment, calculation agent, amendment mechanics, and notice requirements. A benchmark change can alter interest expense, yield, hedge accounting, and valuation.

The Bottom Line

The American Financial Exchange was a bank-funding marketplace tied to AMERIBOR. Its financial significance now lies less in new-market growth and more in understanding legacy benchmark references, credit-sensitive rate design, and the mechanics of rate replacement.