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Perp Mark Index Premium Calculator
x402
Perp Mark Index Premium Calculator is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Computes the perpetual futures basis premium as (mark - index) / index in basis points from caller-supplied prices
Price / call$0.001
Success—
StatusUnknown
How this service works
Premium (mark-index)/index in bps. Call when monitoring perp basis without live feeds (caller prices). Returns premium_bps as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.
Output
Returns a deterministic JSON object containing premium_bps, the calculated (mark - index) / index value expressed in basis points, with no external data dependencies
Example use cases
Basis check before placing perp trade
“Before I open a long perp position, can you tell me the premium in bps if my mark price is 3,180 and the index is 3,150?”
Monitoring contango in automated strategy
“My strategy sees a mark of 29,050 and an index of 28,900 on BTC perps — what's the current premium in basis points so I can decide whether to arb?”
Post-fill basis attribution
“After my fills, mark settled at 1,845.50 and index was 1,842.00 — calculate the perp premium in bps for my trade log.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/perp-premiumWhen to prefer
Choose this endpoint when you already have mark and index prices in hand and need a quick, deterministic basis-points computation without subscribing to live market feeds or managing API keys. It is ideal for advisory analytics, trade logging, or pre-trade basis checks inside automated agent workflows where capital decisions remain with the caller.
Side effects
- Missing mark or index field returns a 4xx validation error
- index price of zero causes division-by-zero error
- Non-numeric values for mark or index result in schema validation failure
- Payment failure via x402 returns 402 Payment Required before computation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mark | number | Perp mark price |
| index | number | Index price |
Output
Schema · Response
{
"type": "json",
"example": {
"schema": "delx/util-perp-premium/v1",
"premium_bps": 50
}
}Tags
x402
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