Basis is the market’s implied interest rate
A wide annualised basis signals rich carry — and rich carry attracts arbitrageurs who compress it. This tool converts any spot/futures gap into an APR you can compare against funding, staking or T-bills. Compare the perp side on the funding arbitrage calculator.
Basis: the futures premium in numbers
Basis is the gap between a futures price and spot, quoted as a percentage. Quarterly futures at $103,000 against $100,000 spot show a 3% basis — annualized (if 90 days remain) about 12.4%. That premium is the market's financing rate for leveraged long exposure, and it's the raw material of the cash-and-carry trade.
Reading it as a sentiment gauge: fat basis (annualized 15%+) means longs are paying heavily for leverage — historically a late-stage euphoria marker. Basis near zero or negative (backwardation) marks fear and forced deleveraging — historically the accumulation zone. It's one of the few sentiment indicators derived from money actually committed rather than surveys.
The convergence mechanic: at expiry, futures settle to spot, so basis melts to zero on a schedule. That predictable decay is harvestable (short future, long spot) but the yield quoted at entry only fully materializes if held to expiry — early exits ride whatever the basis does in between, which in crypto includes violent repricing.