The basic idea sounds simple: long the lower-funding venue, short the higher-funding venue, and collect the gap.
Live trading is less tidy. When one side goes wrong, the other side is usually affected too. These are the situations worth preparing for before size increases.
One leg fills, the other does not
This is the most common early mistake. A short fills on Binance; while you hedge with a long on Lighter, price moves, the connection lags, or the book is too thin. You now have a leveraged directional position.
How to reduce it: run a small full-cycle test first. Learn minimum sizes, limit-order behavior, and real slippage. Use a limit order for the first leg where liquidity is stronger, then hedge quickly. Once filled, check matched notional before looking at PnL.
Price can be hedged while margin is not
Venues calculate margin separately. Mark prices, maintenance rates, and liquidation rules differ. During a sharp drop, the short leg may gain while the long leg becomes stressed by a local mark-price wick. If the long is reduced first, the remaining short is exposed.
How to reduce it: keep more margin than the minimum and reduce proactively when conditions deteriorate. Waiting for the platform to act is rarely comfortable.
Historical spread is not future income
Funding reflects crowding, and crowding changes. Listings, campaigns, news, or a large trader moving inventory can change the balance quickly. A strong 30D figure describes the past, not the next month.
How to reduce it: read 7D, 14D, and 30D together. If the longer window is strong but the recent window is shrinking, reduce size or step aside until a new structure forms.
Liquidity disappears at the exit
Normal books can look deep until a fast move. In smaller contracts, everyone may be trying to leave at once. A distant stop can fill far from its trigger.
How to reduce it: use staged reductions. Preserve the ability to act first; worry about the perfect exit price second.
The venue is part of the risk
Cross-platform trading relies on two separate systems. Maintenance, API errors, browser lag, and delayed transfers can all arrive at the wrong moment. Avoid concentrating all capital on one venue or one symbol. When a venue becomes unstable, stop opening new risk and verify existing hedges first.