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Delx Overround Calculator
x402
Delx Overround Calculator is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Computes the overround (sum of implied probabilities minus 1) from an array of market probabilities
Price / call$0.001
Success—
StatusUnknown
How this service works
Overround/vig from a set of mutually exclusive implied probs. Call when measuring book margin before de-vigging. Returns overround and sum of probs 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 JSON object containing the count of input probabilities (n), the schema identifier (delx/util-overround/v1), the computed overround as a decimal (e.g. 0.10 means 10% margin), and the raw sum of all input probabilities (sum_probs).
Example use cases
Bookmaker margin check for bettors
“I have three outcomes in a football match with implied probabilities of 0.52, 0.30, and 0.28 — can you calculate the overround so I know how much the bookmaker is padding the odds?”
Arbitrage opportunity screening
“Before I try to arb this tennis match, check the overround for me — the probabilities across all books are 0.48, 0.55 for the two outcomes. Is there any edge there?”
Prediction market fairness audit
“I'm auditing a prediction market with outcomes at probabilities 0.40, 0.35, and 0.30 — compute the overround so I can see how far above 100% the total sits.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/overroundWhen to prefer
Use this endpoint when you need a fast, cheap ($0.001 USDC) single-call computation of bookmaker or market overround from raw implied probabilities. Prefer it over implementing your own summation logic when operating in an agent pipeline that already uses x402 micropayments, or when you want a consistent schema-versioned result (delx/util-overround/v1) for downstream processing.
Side effects
- Empty or missing probs array returns an error or zero result
- Non-numeric values in the probs array may cause a parsing failure
- Probabilities that individually exceed 1.0 may produce unexpected overround values
- Network or payment authorization failure returns HTTP 402 or 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| probs | array | Input field: probs. |
Output
Schema · Response
{
"type": "json",
"example": {
"n": 2,
"schema": "delx/util-overround/v1",
"overround": 0.1000000000000001,
"sum_probs": 1.1
}
}Tags
x402
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