What Are Crypto Funding Fees? A Beginner's Guide to Perpetual Futures Funding

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Introduction

If you've traded crypto perpetual futures on Binance, Bybit, OKX or any similar venue, you've seen a small line item called the funding fee. It can quietly add to your costs — or quietly pay you — depending on which side you're on. This guide explains what funding fees are, who pays them, and how to estimate them before you open a position.

This article is for educational purposes only. It is not financial advice. Trading perpetual futures carries significant risk and you can lose money.

What is a perpetual future?

A perpetual future ("perp") is a derivative that tracks the price of an asset like Bitcoin but never expires. Because there's no expiry date to pull the contract price back toward spot, exchanges need another mechanism to keep the two aligned. That mechanism is the funding rate.

What is the funding rate?

The funding rate is a small percentage exchanged between traders — not paid to the exchange — at regular intervals. It nudges the perpetual price toward the underlying spot price:

• When the perp trades above spot, the funding rate is usually positive, and longs pay shorts.
• When the perp trades below spot, the funding rate is usually negative, and shorts pay longs.

Most venues settle funding every 8 hours, though some use 4-hour or 1-hour intervals.

Who pays the funding fee?

It comes down to two things: your side and the sign of the rate.

Your side	Positive rate	Negative rate
Long	You pay	You receive
Short	You receive	You pay

How is it calculated?

The math is simple:

Funding payment = Position notional × Funding rate

…charged once per interval. Hold across several intervals and it adds up. For example, a $10,000 long at a 0.01% rate settling every 8 hours pays about $1 per settlement — roughly $3 per day.

You can run your own numbers in seconds with our free Funding Fee Calculator. Enter your side, size, rate and how long you plan to hold, and it shows what you'd pay or receive, plus the annualized equivalent. Everything is typed in by hand — nothing connects to any exchange.

Why it matters

Over a long hold, funding can meaningfully change your real result — for better or worse. Knowing the number ahead of time helps you stay in control and avoid surprises. If you keep a trading journal, it's worth recording funding alongside your entries and exits so your performance numbers tell the whole story.

Key takeaways

• Funding fees are periodic payments between long and short perp traders, not a charge from the exchange.
• Positive rate: longs pay shorts. Negative rate: shorts pay longs.
• Funding = notional × rate, charged per interval.
• Estimate it before you trade with the Funding Fee Calculator.