Crypto perpetuals and funding rates, explained

Almost all crypto leverage trades through perpetual futures- "perps". They're the instrument behind nearly every signal you'll see, and the funding mechanism that keeps them honest quietly affects your returns. Here's how they work.

What a perpetual actually is

A normal futures contract has an expiry date. A perpetualnever expires - you can hold it indefinitely. That convenience creates a problem: with no expiry to force convergence, what stops the perp's price from drifting far away from the underlying spot price? The answer is funding.

Funding: the tether to spot

Every few hours, traders on one side of the market pay traders on the other a small funding payment, calculated from how far the perp trades above or below spot:

• Positive funding - the perp is trading above spot (longs are eager). Longs pay shorts. This nudges the price back down.
• Negative funding - the perp is below spot (shorts are eager). Shorts pay longs, nudging price back up.

It's an elegant, self-correcting tether: the crowded side pays the patient side, which discourages the crowd and keeps the perp anchored to spot.

Why it matters to your P&L

Funding is usually small - a few basis points - but it compounds. If funding is +0.05% every 8 hours and you hold a long for three days, you've paid roughly 0.45% just to keep the position open, before any price move. On a fast scalp that's noise; on a multi-day hold in a crowded long, it can turn a marginally-correct trade into a loss.

This is why MasterBitcoin surfaces the funding rate on every signal and uses funding gates in the strategy: a setup that requires paying steep funding to express is worth less than the same setup with neutral or favourable funding.

Funding as a sentiment signal

Beyond cost, funding reads the crowd. Persistently high positive funding means longs are crowded and leveraged - fuel for a sharp long-squeeze if price stalls. Extreme funding in either direction is often a contrarian warning, not a green light.

The practical takeaways

1. Always check funding before holding a perp overnight - it's a real, recurring cost.
2. Treat extreme positive funding as crowding risk, not confirmation.
3. Factor funding into expected return for slower setups; ignore it for fast ones.

Funding is one input among many. To see where it sits in the full picture, read how to read a signal or the glossary.