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Cross-Venue BTC/ETH Futures-Spot Basis API
x402
Cross-Venue BTC/ETH Futures-Spot Basis API is a paid API for AI agents from nonvisceral-eloisa-mousily.ngrok-free.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Returns per-venue and aggregated futures-spot basis, funding rates, and contango/backwardation verdict for BTC and ETH across Binance, Bybit, and OKX
Price / call$0.02
Success—
StatusUnknown
How this service works
Cross-venue BTC + ETH perp-vs-spot basis across Binance/Bybit/OKX. Per-venue mark/spot/basis/basis_bps/fundingRate/fundingRate_apr_pct, per-symbol aggregate_basis, max_dispersion_bps, avg_funding_apr_pct, verdict (contango>+5bps / flat / backwardation<-5bps). Cash-and-carry arbitrage signal beyond single-venue feeds.
Output
A JSON object keyed by symbol (BTC, ETH), each containing per-venue data (mark price, spot price, basis, basis_bps, funding rate, funding rate APR %), plus aggregate metrics: aggregate_basis, max_dispersion_bps, avg_funding_apr_pct, number of venues reached, venues used, and a verdict string indicating contango (>+5bps), flat, or backwardation (<-5bps). Also includes a top-level source and updated_at timestamp.
Example use cases
Cash-and-carry arb opportunity scanner
“Check if there's a profitable cash-and-carry arbitrage opportunity for BTC perps vs spot right now — show me the basis in bps across Binance, Bybit, and OKX and whether it's in contango.”
Cross-venue basis dispersion alert
“How dispersed is the BTC futures-spot basis across Binance, Bybit, and OKX right now? I want to know the max dispersion in basis points and which venue is the outlier.”
ETH funding cost comparison for hedged positions
“I'm holding spot ETH and want to short ETH perps to hedge — what's the current funding rate APR across Binance, Bybit, and OKX, and what's the aggregate average funding cost I'd be paying?”
Technical details
Endpoint
GEThttps://nonvisceral-eloisa-mousily.ngrok-free.dev/api/futures-spot-basisWhen to prefer
Choose this endpoint when you need a cross-venue, multi-symbol view of the perp-vs-spot basis and funding rates in a single call rather than polling each exchange individually. It is especially valuable for cash-and-carry arbitrage signal detection, cross-venue dispersion analysis, and funding-rate hedging cost estimation across BTC and ETH simultaneously. Prefer it over single-venue feeds when venue-to-venue discrepancies matter or when you want a machine-readable contango/backwardation verdict without building your own aggregation logic.
Side effects
- One or more upstream venues (Binance/Bybit/OKX) unreachable — n_venues_reachable may be less than 3, reducing aggregate reliability
- Stale data if upstream exchange APIs are slow or rate-limiting
- No query parameters required so no input validation errors expected
- ngrok free-tier URL may have uptime or rate-limit constraints
- Payment failure (x402) if USDC balance is insufficient for the $0.02 per-call fee
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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