Funding rate arbitrage

What funding is

Perpetual futures never expire, so their price could drift away from spot. To keep them close, exchanges use funding — a regular payment between traders; the exchange keeps none of it.

• Positive rate — futures trade above spot, more buyers. Longs pay shorts.
• Negative rate — futures trade below spot. Shorts pay longs.

Payments usually happen every 8 hours (00:00, 08:00 and 16:00 UTC on Bybit and Binance); some coins and exchanges pay every 4 or 1 hour. The payment is calculated on position size, not margin:

A normal bitcoin rate is about 0.01% per 8 hours — roughly 11% a year. During altcoin manias rates reach 0.1% and more — over 100% a year for the receiving side.

The idea of funding arbitrage

A regular trader collects funding together with price risk: hold a short, collect payments, lose it all if price rallies. An arbitrageur removes price risk by opening two opposite positions of equal size: what one loses, the other gains. Price stops mattering, funding stays. This is a delta-neutral position.

Setup 1: spot + short on one exchange

1. Buy the coin on spot for $X.
2. Open a futures short for the same $X.
3. Price up — spot gains, short loses the same. Price down — the opposite. Net price effect ≈ 0.
4. Every 8 hours the short receives funding while the rate is positive.

Pros: one exchange, simple, no price gap between venues. Cons: low yield on large caps, and when funding turns negative the setup starts paying — then you close it.

Setup 2: long and short on two exchanges

The same coin often has different funding on different exchanges — say +0.05% on Bybit and +0.01% on Binance per 8 hours. Then:

• the short goes where the rate is higher (it receives 0.05%);
• the long goes where it is lower (it pays 0.01%);
• you earn the spread: 0.05% − 0.01% = 0.04% per 8 hours.

It works with negative rates too: at −0.30% on one exchange and −0.05% on another, the long goes on the first (receives 0.30%), the short on the second (pays 0.05%), spread 0.25%. Both legs are futures, so a small leverage ties up less capital. This is exactly what the "Funding arbitrage" scan in our bot looks for.

Example on $10,000

Option 1: spot + short on bitcoin

$10,000 capital, BTC funding 0.01% per 8 hours, 1× short.

Modest — a savings-account yield in a quiet market. It gets interesting when a coin's funding rises to 0.05–0.1%: income grows 5–10× with the same fees.

Option 2: two exchanges

$10,000 capital, $5,000 on each exchange, 2× leverage. Funding +0.05% on exchange A and +0.01% on exchange B per 8 hours.

Fees pay back in under two days. The key words are "if rates stay the same": in practice a spread lives from hours to a few days, so real income is lower and you rotate into new pairs. Try your own numbers in the calculator above.

The risks nobody mentions

1. Rates change every period. +0.05% today, −0.02% tomorrow. Check before each payment; exit when the spread is gone.
2. Liquidation of one leg. The pair is neutral, but each leg has its own margin. At 2× a ~50% rally liquidates the short while the long's profit sits on another exchange. Keep leverage at 1–3× and watch margin; the liquidation calculator shows the price.
3. Price gap between exchanges. Prices differ by tenths of a percent; a bad entry gap eats days of funding.
4. Different payment intervals. 0.05% every 8 hours vs 0.02% every hour is 0.15% vs 0.48% a day. Compare rates normalised to one period.
5. Liquidity. Exotic coins show hundreds of percent a year, with wide spreads and slippage. Thin volume is the first reason to skip.
6. Exchange risk. Your money sits on two venues; frozen withdrawals are a real risk no formula removes.

Funding arbitrage is not free money — it is small, regular income with known risks. Not investment advice: start small.

Where to find opportunities

Comparing hundreds of coins across five exchanges by hand takes forever. The AI Trading Room bot has a "💱 Funding arbitrage" scan: it compares rates on Bybit, Binance, OKX, Bitget and Gate, normalises them to one period and lists the best pairs with:

• where to short and where to long, yield per year and per day;
• how fast the four trades' fees pay back;
• the current price gap between exchanges;
• the next payment time — to enter right after a payment you would otherwise pay;
• turnover on both exchanges — illiquid coins are filtered out.

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