What is SOFR?

SOFR (the Secured Overnight Financing Rate) measures the cost of borrowing cash overnight using US Treasury securities as collateral. It matters because it replaced LIBOR as the primary dollar benchmark for many loans, derivatives, and securities, providing a transaction-based, transparent view of short-term funding costs.

How SOFR Is Calculated

The rate is produced by the Federal Reserve Bank of New York together with the Office of Financial Research. Each business day they collect transaction data from the previous day’s repurchase agreement (repo) market—where cash is lent against Treasury collateral—and produce a single overnight reference rate. Because it is built from actual trades, SOFR is considered more robust than estimate-based benchmarks.

Where the Data Comes From

SOFR is calculated using data from three main types of repo transactions:  

• Third-party repos: trades executed through an intermediary.
• General Collateral Financing (GCF) repos: transactions cleared through a central counterparty.
• Bilateral repos: direct agreements between two counterparties, often cleared by a central facility.

The Calculation Method

The administrators aggregate the trade-level data and compute a volume-weighted median interest rate. The large daily volumes in the underlying market help smooth out extreme values, producing a stable overnight figure that is published each morning for the prior business day.

Making a Daily Rate Useful for Long-Term Products

SOFR is an overnight rate, but what about loans that last for months or years? To solve this, the market uses two key tools:

• SOFR Averages: These are simple averages of the daily SOFR rate over a set period, like 30, 90, or 180 days. This creates a smoother, less volatile rate for longer-term contracts.  
• The SOFR Index: This index compounds the daily SOFR value over time. It makes it much easier to calculate the total interest owed on products like loans and bonds without having to track and apply the rate every single day.  

Where SOFR Is Used

The transition from LIBOR required broad legal and operational change, but SOFR’s market-based design has made it the standard for many dollar-denominated products. Common uses include:

• Floating-rate corporate and bank loans
• Interest rate derivatives, such as swaps and futures
• Debt securities and securitized products
• Adjustable-rate consumer products like some mortgages

The Pros and Cons of SOFR

SOFR was created to fix the problems with LIBOR, but like any system, it has its own unique characteristics.  

Key Benefits:

1. Based on Real Trades: It reflects the real cost of borrowing, not just estimates.  
2. Deep Liquidity: The underlying repo market sees over $1 trillion in transactions daily, making the rate robust.
3. Low Risk: Because all transactions are secured by U.S. Treasuries, there is very little credit risk baked into the rate.  

Practical Limitations:

1. It's an Overnight Rate: It only reflects the past day's activity. To create forward-looking rates (e.g., a 3-month rate for the future), extra calculations and derivatives are needed.  
2. Transition Costs: Moving the entire financial system from LIBOR to SOFR was a complex and costly process.
3. Can Spike During Stress: Although it's a secured rate, SOFR can experience sharp, temporary spikes when there is stress in the overnight funding markets.

SOFR Futures

SOFR futures are exchange-traded contracts that let participants hedge or speculate on average SOFR over a future period. They are cash-settled and quoted as 100 minus the anticipated interest rate, so prices move inversely to expected SOFR. Clearinghouses manage daily margining to limit counterparty risk.

Standard Contract Types

• 1-month SOFR futures: reflect the average overnight rate over a month and are typically valued at about $25 per basis point.
• 3-month SOFR futures: reflect a three-month average and are commonly valued at about $12.50 per basis point.

Why Use SOFR Futures?

These futures are practical tools for hedging exposure to variable-rate assets, for gauging market expectations about short-term funding costs, and for supporting the creation of forward-looking term rates. They also offer a way to take directional views on monetary policy and liquidity conditions.

How SOFR Compares to Other Short-Term Benchmarks

Compared with LIBOR, SOFR is grounded in secured repo transactions rather than bank-submitted estimates, reducing the risk of manipulation. Against the federal funds rate, SOFR reflects secured borrowing with broader counterparty participation. Other jurisdictions have similar overnight risk-free rates tied to their domestic markets, but each benchmark depends on its own funding ecosystem.

Does SOFR Influence Cryptocurrency Markets?

SOFR doesn't directly control the price of Bitcoin or Ethereum, but it acts as a barometer for the health of traditional finance (TradFi), which in turn impacts crypto. 

A rising SOFR can indicate tighter funding and reduced risk appetite, which may weigh on speculative assets including cryptocurrencies. 

A lower SOFR can coincide with looser funding and stronger demand for higher-risk investments. Futures markets for SOFR also communicate expectations that can affect broader market sentiment.

Key Takeaways

SOFR is a transparent, trade-based overnight benchmark that underpins many dollar-denominated financial products. Its index and average constructs allow application to longer-term contracts, and futures provide hedging and price-discovery tools. SOFR addresses many of the weaknesses that prompted the market to move away from LIBOR.