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4SEC Futures Basis API
x402
4SEC Futures Basis API is a paid API for AI agents from api.foursec.xyz, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).
Returns the futures basis (spot vs perpetual price spread) for a given crypto symbol across multiple exchanges, including the best carry trade opportunity.
Price / call$0.02
Success—
StatusDown
How this service works
Real-time multi-DEX aggregated crypto market data. Pay per request with USDC on Base via x402 protocol.
Output
Returns a JSON object containing the symbol, current spot price, the best carry trade opportunity (as a string label), and a breakdown of perpetual swap prices or funding rates by exchange. Useful for identifying cross-exchange basis arbitrage and cash-and-carry trades.
Example use cases
Carry trade opportunity scanner
“Find me the best carry trade opportunity for ETH — I want to see the spot price, perp rates across exchanges, and which exchange has the highest basis I can capture.”
Cross-exchange basis arbitrage
“Pull the current futures basis for SOL across all exchanges and tell me where the biggest spread between spot and perp exists right now.”
Real-time funding rate dashboard
“I'm building a dashboard — give me the live perp funding rates by exchange for BTC and flag the best carry trade opportunity available.”
Technical details
Endpoint
GEThttps://api.foursec.xyz/futures/basis/%7Bsymbol%7DWhen to prefer
Choose this endpoint when you need real-time, aggregated futures basis data across multiple exchanges for a single crypto symbol, especially for carry trade analysis. It is ideal for agents performing derivatives arbitrage research, funding rate monitoring, or cash-and-carry strategy evaluation. Prefer this over single-exchange APIs when cross-exchange comparison is essential.
Side effects
- Invalid or unsupported symbol returns an error or empty data
- Payment not processed via x402 protocol results in 402 Payment Required response
- Network latency from aggregating multi-exchange data may occasionally cause timeouts
- Symbol not listed on any tracked exchange may return null or empty perp_by_exchange object
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "object",
"example": {
"symbol": {
"type": "string"
},
"spot_price": {
"type": "number"
},
"best_carry_trade": {
"type": "string"
},
"perp_by_exchange": {
"type": "object"
}
}
}Tags
x402
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