A backlog is a promise. Cash flow is the invoice.

This week the AI build-out met its oldest constraint: the cost of waiting to be paid. CoreWeave, a so-called neocloud that rents out computing power, has taken on more than $51 billion of debt and obligations to fund its build-out¹. On Thursday the yield on its 9.75% bond due 2031 reached 15.78%, and the spread on its five-year credit default swaps, insurance against default, briefly went above 1,140 basis points before settling near 1,038¹. S&P Global Market Intelligence’s Gavan Nolan said a spread of 1,000 basis points or more is generally a sign of credit distress¹.

The counter-argument is a big number. The company’s backlog is over $100 billion, about two-thirds of it with investment-grade customers, Deutsche Bank said¹. Nolan’s point was that no one doubts the demand; “the question is whether the cash flows will ultimately arrive”¹. A backlog is a promise to pay later. A bond coupon is due on a date.

The stress travelled. Oracle’s five-year spread rose about 10% on the week, to around 282 basis points¹, and the Journal said investors were fretting over how higher borrowing costs hit the most leveraged players in the data-centre build-out².

The constructive read: this is markets doing their job early. Pricing financing risk while the chips are still in demand is far cheaper than discovering it after the build-out. The machines are real; the invoices will decide who owns them.