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Settlement Risk: The Herstatt Lesson and Why CLS Exists

When two parties exchange currencies, each sends money to the other, often in different time zones and payment systems. That creates a gap during which one side may pay while the other has not. This is settlement risk.

In 1974, a German bank, Bankhaus Herstatt, was closed by regulators in the afternoon after receiving deutsche marks from counterparties in Frankfurt, but before it had delivered the corresponding dollars in New York. Counterparties lost the dollars they were due, and the event gave the risk its name: Herstatt risk.

The industry response, decades later, was CLS Bank, which began operations in 2002. It settles trades on a payment-versus-payment basis, meaning that each side's payment is made only if the other side's payment is made at the same time. A large share of eligible currency trading settles through it.

For retail traders, the risk is hidden, because your broker handles settlement. But the lesson applies in a different form: counterparty risk exists everywhere in finance, and systems exist to reduce it.

It also illustrates why regulation of the infrastructure matters. The failure of one participant can ripple through the system unless protective designs exist.

Your own exposure concerns the broker, as discussed earlier. Understanding the larger system clarifies what is protected and what is not.

Practical step: find out whether your broker's liquidity or settlement arrangements are described in its disclosures.

Good bit of history. For retail traders the modern version of this is simply: who holds your money, and what happens if they fail? Segregated funds and the regulator matter far more than the spread. Segregation means your deposits are supposed to be kept apart from the broker's own money, so creditors can't take them if the broker goes under. Some regulators also have compensation schemes that cover clients up to a limit. Offshore brokers often offer neither. It's worth reading the client money section of your broker's terms once. It's dull, but it tells you what actually protects you if the broker runs into trouble, which a tight spread never will.

The time zone part is a neat detail. A payment in one city can be done hours before the other leg in another city, and that window is where the risk lived. Herstatt's counterparties had paid their marks in Frankfurt during the European day, and the dollars they were owed were due later in New York, which never came. That gap of a few hours was enough to cause real losses. It's a nice reminder that the market we trade on a screen sits on top of a lot of plumbing. Most of the time it works so well we never think about it, which is exactly why it gets attention only when it breaks.