Kerdos Cross-Venue Futures-Spot Basis
https://nonvisceral-eloisa-mousily.ngrok-free.dev/api/futures-spot-basisOverview
BTC and ETH perpetual-mark vs spot-index basis aggregated across Binance / Bybit / OKX. Per-venue mark, spot index, basis (mark/spot - 1) raw and basis_bps, fundingRate and fundingRate_apr_pct (8h funding annualized 1095x), plus per-symbol aggregate_basis, max_dispersion_bps (cross-venue basis spread), avg_funding_apr_pct, n_venues_reachable, and verdict (contango above +5bps / backwardation below -5bps / flat). Cash-and-carry cross-venue arbitrage signal beyond single-venue funding feeds — captures basis-trade entry windows when one venue diverges from cross-venue mean.
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