The Fed's standing repo facility pre-commits a backstop that caps money-market rate spikes

In September 2019, overnight repo rates suddenly jumped to 10% as dealers needed cash against their Treasury collateral. The Fed had to intervene with emergency operations; the episode showed that even a central bank can be caught flat-footed when a market it guarantees has no standing backstop.

On July 28, 2021, the FOMC made the fix permanent. It established two standing repo facilities: a domestic SRF of up to $500 billion per operation for primary dealers and, over time, additional depository institutions, and a standing FIMA repo facility for foreign official institutions with a $60 billion per-counterparty limit.

The elegance is that the facility mostly does nothing. Because dealers know the Fed will lend at 25 basis points whenever repo rates threaten to spike, arbitrage keeps market rates from ever approaching that ceiling — a tripwire that works by existing, not by being used.

Pre-commit to lend at a known rate so panics never form

A pre-announced ceiling changes expectations, so the facility rarely needs to be tapped.

It covers the repo market's structural shortage of Treasury collateral with a standing, always-on window.

It complements the overnight reverse repo facility, giving the Fed both a floor and a ceiling on short-term rates.

The $500 billion cap is large enough to matter, but the fixed rate keeps it from distorting normal trading.

For a backstop to calm a market, it must be known, pre-committed and priced; reacting after the spike arrives is slower and more expensive than making the spike impossible.

The SRF and standing FIMA facility remain in operation, giving the Fed permanent tools to contain money-market stress rather than ad-hoc emergency interventions like those of September 2019 and March 2020.