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Delx Commerce — Half Kelly Criterion Calculator
x402
Delx Commerce — Half Kelly Criterion Calculator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Computes the half-Kelly bet sizing fraction given a win probability and odds multiplier (b), useful for optimal position sizing in trading or betting scenarios.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object containing the input parameters (b, win_prob), a schema identifier (delx/util-half-kelly/v1), and the computed half_kelly fraction as a decimal number representing the optimal fractional bet size.
Example use cases
Sports betting stake optimization
“I think there's a 60% chance my team wins and the bookmaker is offering 1.8x payout — what fraction of my bankroll should I put on it using half Kelly?”
Trading position size calculator
“I've back-tested a strategy with a 58% win rate and an average win-to-loss ratio of 1.5 — what does half Kelly say my position size should be?”
Daily automated agent bankroll management
“My model estimates a 52% win probability on today's trade with odds of 2.0 — calculate the half Kelly fraction so I can size my position correctly.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/half-kelly?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, on-demand computation of the half-Kelly criterion without setting up any account or subscription. Ideal for AI agents performing automated bankroll management, trade sizing, or betting optimization that need a verifiable, pay-per-call microservice at $0.001 USDC per call.
Side effects
- Missing required fields (b or win_prob) returns a validation error
- win_prob outside [0,1] range may return an error or nonsensical result
- b <= 0 (negative or zero odds) may produce undefined behavior
- Payment failure via x402 prevents call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| b | number | Input field: b. |
| win_prob | number | Input field: win prob. |
Output
Schema · Response
{
"type": "json",
"example": {
"b": 1.2,
"schema": "delx/util-half-kelly/v1",
"win_prob": 0.55,
"half_kelly": 0.08750000000000002
}
}Tags
x402
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