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Delx Commerce — Kelly Fraction Calculator
x402
Delx Commerce — Kelly Fraction Calculator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Computes the Kelly Criterion fraction — the optimal bet size as a fraction of bankroll — given a win probability and net odds multiplier.
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 with the computed kelly fraction (a number between 0 and 1 representing the optimal wagering fraction of bankroll), the echoed win_prob and b inputs, and a schema identifier string ('delx/util-kelly-fraction/v1'). A kelly value of 0 or negative indicates the bet has no edge and should not be placed.
Example use cases
Sports betting position sizing
“I think there's a 60% chance my team wins and the bookmaker is offering 1.5x net odds — what fraction of my bankroll should I bet according to Kelly?”
Algorithmic trading stake sizing
“My trading signal has a 52% win rate and the average winner is 1.8x the average loser — calculate the Kelly fraction so I know how much of my portfolio to allocate per trade.”
Poker hand equity sizing
“I'm running a poker simulation where I have a 65% chance of winning the pot and the pot odds give me a net multiplier of 0.9 — what does Kelly say my optimal bet fraction should be?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/kelly-fraction?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, stateless computation of the Kelly Criterion fraction without setting up any account or subscription. Ideal for agents that need on-demand bet-sizing or position-sizing calculations embedded in a larger workflow, especially when paying per-result in USDC via x402 is preferable to a monthly API key. Prefer this over rolling your own formula when you want a verifiable, auditable result with a schema version string.
Side effects
- Missing required fields (b or win_prob) result in a validation error
- win_prob values outside [0,1] may return an error or nonsensical result
- b values of 0 or negative are mathematically invalid and may cause an error
- Payment failure (insufficient USDC) returns HTTP 402 before computation occurs
- Network timeout on the x402 payment layer before response is returned
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,
"kelly": 0.175,
"schema": "delx/util-kelly-fraction/v1",
"win_prob": 0.55
}
}Tags
x402
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