The closest thing the digital-asset market has to a classic carry trade is the perpetual-futures funding rate. It is also one of the cleanest tactical signals available to a systematic crypto book, and it is almost entirely ignored by the retail community.
What funding actually pays
Perpetual futures contracts have no expiry. To keep their price tethered to spot, exchanges run a periodic payment between long and short holders called funding. When the perpetual trades above spot (longs are crowded), longs pay shorts. When the perpetual trades below spot, shorts pay longs. The payment cycle is typically every eight hours.
For a market-neutral book, this funding stream is a yield. Hold spot, short the perpetual, collect the funding. The structure is mechanically similar to a fiat carry trade: you earn the rate differential without taking directional exposure.
Why we use it as a signal, not just as yield
The yield is interesting in isolation. The information embedded in the funding rate is more interesting. Funding tells you, with a delay of minutes, whether the marginal participant in the perpetual market is long or short, and how much they are willing to pay to be there.
Persistent positive funding above an eight per cent annualised threshold has, in our live data, preceded the majority of major BTC drawdowns since 2020. The mechanism is straightforward: when long positioning is crowded and leveraged, even a small adverse move forces unwinds, and the unwinds cascade because the same participants are using the same collateral across the same venues.
How we use it inside the algorithm
The systematic programme tracks funding across the three largest perpetual venues, computes a volume-weighted thirty-session average, and feeds it as one of four inputs into the volatility-regime filter. When the average crosses the upper threshold, the regime filter biases position sizing lower, sometimes meaningfully.
Funding is a yield when nothing is happening, and a warning when something is about to.
What we do not do
We do not run the funding capture trade as a standalone product. The yield is real but the tail risk, principally venue counterparty risk and stablecoin de-peg risk, can wipe out months of accumulated funding income in a single weekend. We use funding as information rather than as a yield strategy because the risk-adjusted return on the latter has been disappointing across full cycles.
The single most expensive mistake we see retail traders make in this space is treating funding as free yield. There is no free yield in crypto. There are yields that are usually fine and occasionally catastrophic. Funding is one of them.