A margin call is a notification from a cryptocurrency exchange that a leveraged position's equity has fallen below the exchange's maintenance threshold, requiring additional collateral or a reduction in position size. According to reports from CoinDesk, margin calls sit between healthy positions and forced liquidation; they are a warning, not an execution. In traditional finance, a broker would phone you and give you a day or two to deposit more money, but in crypto, the process is automated and runs around the clock. The distinction matters because crypto markets never close, meaning a margin call at 3 a.m. on a Sunday gives the same narrow window to respond as one during regular trading hours.
Two key numbers govern margin trading arrangements: initial margin and maintenance margin. As reported by CoinDesk, at 10x leverage, initial margin requires 10 percent of the position value. For example, a trader wanting to control $10,000 in bitcoin deposits $1,000. Maintenance margin is the minimum equity the account must hold to keep the position open. On major exchanges such as Binance and Bybit, the maintenance margin rate for large-cap pairs like BTCUSDT starts at 0.5 percent of position value and rises with notional size. The gap between initial margin and maintenance margin creates a buffer zone, and when equity falls into that gap, the margin call fires. This system allows traders to access larger investment positions using only a fraction of the total amount, with the position size remaining the full value regardless of the actual deposit amount.
The October 2025 liquidation cascade demonstrated the devastating consequences of margin calls when ignored. According to CoinDesk reports, approximately 1.6 million traders were liquidated, with total forced closures reaching $19.3 billion in 24 hours. Market makers estimated the true total approached $30 to $40 billion once undisclosed positions on less transparent venues were included. Over $560 billion in total market value was erased during this event. On October 11, 2025, bitcoin fell from roughly $122,000 to under $105,000, a decline of more than 13 percent, in a matter of hours. Every trader holding a 20x long with less than 13 percent of position value as collateral was not just margin called but liquidated outright. The event highlighted how losses are magnified by position size, with a 5% decline on a $10,000 position resulting in a $500 loss, demonstrating the leverage effect that makes margin trading both attractive and risky.
Each major exchange handles margin calls slightly differently, as reported by CoinDesk. Binance uses a tiered maintenance margin system where rates increase in steps as position size grows. A BTCUSDT position under $50,000 requires 0.4 percent maintenance margin, between $50,000 and $250,000 rises to 0.5 percent, and above $5 million reaches 5 percent. Bybit offers both unified and standard margin accounts, with the unified account allowing traders to use unrealized profits from one position as collateral for another. OKX implements portfolio margin mode for larger accounts, calculating risk across all positions using a stress-testing model. In Australia, trading platforms are required to apply margin close-out protections and negative balance protection under the Australian Securities and Investments Commission (ASIC) product intervention rules, providing additional safeguards for retail traders.
Decentralized finance protocols handle margin management differently than centralized exchanges. According to CoinDesk reports, on lending protocols like Aave or Compound, borrowers post crypto collateral and receive loans with health factors that determine liquidation eligibility. When the health factor drops below one, positions become eligible for liquidation by third-party bots. The transition from healthy to liquidated can happen in a single block, roughly 12 seconds on Ethereum. DeFi liquidations also carry additional costs through liquidation penalties, with liquidators typically receiving 5 to 10 percent of the collateral as incentive for performing liquidations. This contrasts with centralized exchanges where margin calls are automated and run continuously, with the distinction being that crypto markets never close, making margin calls a constant risk factor regardless of trading hours.
