Funding Rates Explained: Why Perps Track Spot
The funding rate is the mechanism that keeps a perpetual future tethered to spot. Here's who pays whom, how often, and what it costs — with the details sourced.
If perpetual futures never expire, what keeps their price from drifting away from spot forever? The funding rate. It's one of the most misunderstood mechanics in crypto derivatives — including a myth about who actually collects it.
What the funding rate is
The funding rate is a small, periodic payment exchanged directly between traders holding long and short positions. Critically, it is not a fee charged by the exchange — the venue is just the conduit (Coinbase: understanding funding rates).
Who pays whom
Funding direction follows market demand:
- Positive funding rate → the perp is trading above spot (more demand to be long). Longs pay shorts.
- Negative funding rate → the perp is trading below spot (more demand to be short). Shorts pay longs.
This creates a gentle economic incentive to take the less-crowded side, pulling the perp price back toward spot.
How often it's paid
Funding is exchanged on a fixed schedule. On Binance, funding "usually takes place every eight hours," though some contracts settle every 4 hours — and intervals can shorten during high volatility (Binance: introduction to funding rates). Eight hours (three times a day) is the most common convention, but it varies by venue and contract.
What it actually costs
Funding is charged on your notional position size, not your margin — so leverage amplifies it. Drag the inputs to see how it adds up over time:
Assumes a positive funding rate (longs pay shorts). Funding is exchanged between traders, not paid to the venue.
For a leveraged position held across many intervals, funding can quietly become a meaningful cost (or income, if you're on the receiving side). Traders watch it closely; so should anyone modeling the economics of a venue.
Why it matters for an exchange operator
Funding isn't revenue, but it is a core feature traders expect — and getting it right (accurate index pricing, reliable settlement) is part of what makes a venue trustworthy. It also interacts with liquidation: funding payments draw down margin, which can bring a position closer to its liquidation price.
The takeaway
The funding rate is the tether that keeps a no-expiry contract honest to spot. Longs and shorts pay each other, typically every 8 hours, on notional — and the exchange simply runs the mechanism.
Funding intervals and formulas vary by exchange; figures reflect the cited documentation.
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