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x402stock Basis Spread API
x402
x402stock Basis Spread API is a paid API for AI agents from x402stock.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11).
Returns the current basis spread (price difference) between US equity spot prices and their corresponding on-chain perpetual futures contracts on Hyperliquid
Price / call$0.05
Success—
StatusUnknown
How this service works
Scans every US stock that also trades as a 24/7 synthetic perp and returns the gap: official (delayed) price, prev close, perp mark and oracle, funding APR, open interest, and computed `basis_percent` + `basis_vs_prev_close_percent` — the implied overnight move while the US market is shut. Widest dislocation first, plus a plain-English `reading`. `?limit=`, `?min_basis=`. From x402stock
Output
A JSON array of rows, each representing a US equity ticker matched to its on-chain perpetual counterpart, including: spot equity price and previous close, perp mark and oracle prices, basis in percentage and absolute dollar terms, basis vs previous close, direction (premium/discount/flat), perp funding APR, open interest, day volume in USD, whether the pair is comparable, and any exclusion reason. Also includes metadata: timestamp, US market open status, venue map (equity source and perp venue), a reading summary of the widest dislocations, and total available pairs.
Example use cases
Overnight equity sentiment via perps
“The US market is closed right now — can you pull the basis spread data to see what on-chain perp traders think about where stocks will open tomorrow? Show me up to 50 results.”
Spot arbitrage opportunity scanner
“I want to find US equities with at least a 1% basis spread between spot and Hyperliquid perps right now — show me the top 20 so I can evaluate potential arb trades.”
Perp funding rate monitor for tech stocks
“Pull the current basis data for all US equities and tell me which ones have the highest perpetual funding APR on-chain — I want to see what the funding environment looks like.”
Technical details
Endpoint
GEThttps://x402stock.xyz/api/v1/basis?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to compare US equity spot prices against their Hyperliquid on-chain perpetual futures equivalents — specifically to measure basis spread, funding rates, or gauge overnight/off-hours market sentiment. Prefer this over generic stock price endpoints when the user is interested in derivatives, basis trading, arbitrage between spot and perp, or using perpetual futures as a real-time proxy for equity sentiment when US markets are closed.
Side effects
- No pairs meet the min_basis threshold — returns empty rows array
- Symbol collision: pairs differing by more than 25% are marked comparable=false with an excluded_reason
- Perp or equity data feed temporarily unavailable — sections field will indicate which feed is down
- limit exceeds 200 — request rejected with validation error
- Stale data during market transitions or feed outages
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"note": null,
"rows": [
{
"ticker": "NVDA",
"direction": "premium",
"perp_mark": 182.95,
"comparable": true,
"perp_oracle": 182.88,
"perp_symbol": "xyz:NVDA",
"equity_as_of": "2026-07-30T20:00:00.000Z",
"equity_price": 181.42,
"basis_percent": 0.84,
"basis_absolute": 1.53,
"excluded_reason": null,
"equity_prev_close": 180.11,
"perp_open_interest": 41230.5,
"perp_day_volume_usd": 9128441.22,
"equity_change_percent": 0.73,
"perp_funding_apr_percent": 11.42,
"basis_vs_prev_close_percent": 1.58
},
{
"ticker": "TSLA",
"direction": "discount",
"perp_mark": 401.02,
"comparable": true,
"perp_oracle": 401.11,
"perp_symbol": "xyz:TSLA",
"equity_as_of": "2026-07-30T20:00:00.000Z",
"equity_price": 402.11,
"basis_percent": -0.27,
"basis_absolute": -1.09,
"excluded_reason": null,
"equity_prev_close": 399.4,
"perp_open_interest": 18220.1,
"perp_day_volume_usd": 4410233.9,
"equity_change_percent": 0.68,
"perp_funding_apr_percent": -3.19,
"basis_vs_prev_close_percent": 0.41
}
],
"as_of": "2026-07-30T23:40:00.000Z",
"count": 2,
"method": "Legs are joined by ticker symbol. Macro perps (commodities, FX, indices) are excluded because their symbols collide with unrelated US tickers, and any remaining pair differing by more than 25% is treated as a symbol collision rather than a dislocation — see `comparable` and `excluded_reason` per row.",
"source": "x402stock",
"reading": "US market closed — the 24/7 perp is the live opinion of where these reopen. Widest vs last print: NVDA at 0.84%.",
"sections": {
"perps": "ok",
"equities": "ok"
},
"venue_map": {
"perp": "hyperliquid:xyz",
"equity": "us_listed"
},
"us_market_open": false,
"total_available": 2
}
}Tags
x402
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