Extreme funding rates create risk-free arbitrage opportunities. When funding is highly positive, shorting perps while holding spot earns yield with zero directional exposure.
Perpetual futures have no expiry. Instead they use a funding rate mechanism — paid every 8 hours — to keep the perp price anchored to spot. When perps trade at a premium, longs pay shorts. When at a discount, shorts pay longs.
When funding rate exceeds 0.05% per 8 hours (0.15% daily, 54% annualised), the trade is: long spot, short the equivalent perp. You earn funding every 8 hours with zero net market exposure.
The main risks are basis risk if the spread widens before you can close, liquidation risk on the short if you are under-collateralised, and execution risk if you cannot fill both legs at acceptable prices simultaneously.
def check_funding_arb(symbol, threshold=0.0005):
r = requests.get(f"https://api.lmex.io/futures/api/v2.3/market_summary",
params={"symbol": symbol})
rate = float(r.json()[0]['fundingRate'])
if abs(rate) > threshold:
side = "short_perp_long_spot" if rate > 0 else "long_perp_short_spot"
print(f"Arb opportunity: {side} at rate {rate:.4%}")
return rate
Q: What funding rate threshold makes the arbitrage trade worthwhile on LMEX?
A rate above 0.05% per 8 hours (0.15% per day, approximately 54% annualised) typically covers transaction costs and provides meaningful yield. Higher thresholds like 0.1%+ offer more margin for slippage and execution risk.
Q: What are the main risks of funding rate arbitrage on LMEX?
The three key risks are basis risk (the spread between spot and perp widening before you close), liquidation risk on the short perp position if you are under-collateralised, and execution risk if you cannot fill both legs at acceptable prices simultaneously.
Q: How do I hedge the spot position in a LMEX funding rate arbitrage trade?
Buy spot on LMEX or another exchange while shorting the equivalent perpetual on LMEX. The net delta is zero — you have no directional exposure. Profit comes purely from the funding rate paid to your short every 8 hours.
Q: How often does a high-yield funding rate opportunity occur on LMEX?
During bull market peaks and periods of high leverage, funding rates above 0.05% occur multiple times per month. During bear markets or low-volatility periods, rates are often near zero or negative, making the trade less attractive. Monitor rates regularly via the LMEX API.