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Delx Commerce — Expected Log Growth Calculator
x402
Delx Commerce — Expected Log Growth 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 expected logarithmic portfolio growth (Kelly criterion-style) given a bet fraction, true probability, and market price.
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 schema identifier 'delx/util-expected-log-growth/v1', the echoed input fraction, and the computed expected_log_growth as a floating-point number representing the expected logarithmic growth of the bankroll under the given parameters.
Example use cases
Prediction market bet sizing
“I'm thinking of betting 15% of my bankroll on a prediction market where I think the true probability is 65% but the market is pricing it at 58% — what's the expected log growth of that position?”
Kelly criterion edge verification
“Check whether a 5% bet fraction gives positive expected log growth when the true probability is 52% and the market price is 0.50.”
Optimal fraction sensitivity analysis
“I want to see the expected log growth for a fraction of 0.20, with a true probability of 0.70 and a market price of 0.65 — is this a good size for my edge?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/expected-log-growth?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, pay-per-result computation of expected logarithmic growth (Kelly-style) for a binary bet or prediction market position, without requiring account setup. Prefer it over manual Kelly calculation when operating inside an agent pipeline that can pay micro-amounts in USDC and needs verifiable, structured output.
Side effects
- Missing required fields (fraction, true_prob, or market_price) return a validation error
- Invalid probability values outside [0,1] may produce mathematically undefined results or errors
- Market price equal to 0 causes division-by-zero or undefined log output
- Payment failure via x402 returns 402 Payment Required before computation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fraction | number | Input field: fraction. |
| true_prob | number | Input field: true prob. |
| market_price | number | Input field: market price. |
Output
Schema · Response
{
"type": "json",
"example": {
"schema": "delx/util-expected-log-growth/v1",
"fraction": 0.1,
"expected_log_growth": 0.02704230164346613
}
}Tags
x402
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