Coin-Margin Contracts: The Secret to Achieving Steady Arbitrage with Margin Mechanisms

The coin-margined contract uses the cryptocurrency as collateral, and all profits and losses are calculated in that cryptocurrency, while the USDT-margined contract is calculated entirely in USDT. The core difference between these two mechanisms lies in the interaction between collateral and price fluctuations, which directly affects the trader’s risk tolerance and potential returns. To understand the advantages of coin-margined contracts, one must first grasp the essential differences between them and USDT-margined collateral.

What are the differences in collateral calculation between coin-margined and USDT-margined contracts?

The collateral for coin-margined contracts is calculated in cryptocurrency, and the liquidation price is determined based on the USDT value at the time of opening the position; fluctuations in the cryptocurrency price do not change the liquidation price itself. This is closely related to spot trading—you need to first buy the cryptocurrency with USDT in the spot market before you can open a contract, so coin-margined contracts inherently include a feature of going long by a factor of one.

In contrast, USDT-margined contracts calculate both collateral and liquidation price in USDT, meaning that changes in the cryptocurrency price do not affect the USDT value of the collateral. This implies that coin-margined traders bear additional risks from spot market volatility from the outset, but at the same time, it opens up many unique arbitrage mechanisms.

Long risk and the benefits of margin replenishment: the hidden advantages of coin-margined contracts

A coin-margined contract with a long position will trigger liquidation when the cryptocurrency price drops by 50%. Suppose you buy 10,000 units of the cryptocurrency with 10,000 USDT; when the price approaches a 50% drop, you will need to add collateral. Here comes the key advantage—you can use the same 10,000 USDT to buy 20,000 units of the cryptocurrency at a low price as additional collateral, ensuring that you never get liquidated and simultaneously increasing your position at a low point.

This creates a clever situation: the original 10,000 units of cryptocurrency will incur a loss of 5,000 USDT when the price drops by 50%, but after adding collateral, you hold 30,000 units. Once the price rebounds to 67% of the opening price, these 30,000 units can help you break even. If the cryptocurrency price continues to rise afterward, your profits will far exceed a simple long position because you successfully increased your holding at the low point.

A coin-margined contract with a short position will approach liquidation when the cryptocurrency price rises by 50%. Suppose you buy 20,000 units of the cryptocurrency with 20,000 USDT in the spot market, using 10,000 units to open a 3x short position. When the price rises by 50% and you need to add collateral, the remaining 10,000 units are now worth 15,000 USDT, while only 10,000 USDT worth of cryptocurrency is needed as collateral. This way, you use part of your collateral to raise the liquidation price, significantly reducing your risk.

Short arbitrage and funding rates: why coin-margined contracts are more advantageous

In principle, a coin-margined short position with a factor of one is zero-leverage and never liquidates. When the cryptocurrency price drops, the contract acquires more units, and when the price rises, the number of units lost decreases, but since the cryptocurrency price has already risen, the total market value remains unchanged. This is a perfect hedging structure.

Real profits come from funding rates. The funding rate for Bitcoin contracts is positive most of the time, allowing short contracts to continuously collect these rates. Based on current market levels, pure short arbitrage can yield about 7% annualized returns. Combined with the reality that 80% of traders in the market incur losses, this risk-free arbitrage alone is enough to help you outperform most investors.

The key is that this mechanism places very low demands on traders—you do not need to predict market movements accurately; you just need to be able to hold steadily and withstand short-term psychological fluctuations. Many novice traders incur losses precisely because they cannot handle price volatility, while coin-margined arbitrage allows for stable capital inflows to become the primary source of income.

Why are coin-margined contracts only suitable for 1-3x leverage?

The advantages of coin-margined contracts are entirely based on the premise of low leverage. When you use 1-3x leverage, the flexibility of collateral and the benefits of margin replenishment can be fully realized, and price fluctuations become opportunities to increase holdings.

However, once the leverage exceeds 3x, the situation reverses. High leverage significantly reduces the liquidation space, causing you to lose the flexibility of replenishing collateral, and any fluctuation in the cryptocurrency price poses huge risks. At this point, coin-margined contracts no longer have an advantage, but instead become a burden due to their inherent long position feature. Many losing traders blindly pursue high leverage, turning the natural advantages of coin-margined contracts into traps.

Thus, the reasonable operational logic is: use 1-3x coin-margined contracts for low-risk arbitrage or directional trading, fully utilizing the mechanism of collateral replenishment. High-leverage trading should revert to USDT-margined contracts, which are designed to handle aggressive strategies.