Perpetual futures are popular because they do not expire like traditional futures. The price is kept close to spot through funding payments between long and short traders. Binance explains that funding payments are transferred periodically, and Coinbase describes funding as a mechanism that helps align perpetual prices with the underlying spot market.
That makes the funding rate more than a small line item. When funding is positive, longs usually pay shorts. When it is negative, shorts usually pay longs. A trader who holds through many funding intervals can lose money even if the entry price looks roughly unchanged.
Funding also carries sentiment information. Very high positive funding often means long exposure is crowded. Very negative funding can signal crowded shorts. Neither condition guarantees a reversal, but it changes the risk-reward of adding leverage after the move has already become popular.
The practical calculation is to estimate the funding charge across the planned holding period before opening the position. A short scalp may barely notice it, while a multi-day swing trade can see funding become a meaningful part of total risk.
Funding should be read together with basis, open interest, liquidation levels and spot volume. If price rises on weak spot volume while funding jumps, the move may depend heavily on leveraged buyers. That is a different setup from spot-led accumulation.
Sources: Binance introduction to futures funding rates; Binance real-time funding-rate page; Coinbase explainer on perpetual funding rates.
Risk notice: Perpetual futures involve leverage, liquidation risk and variable funding costs. This is educational content, not a recommendation.
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