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QuantOracle Kelly Criterion Calculator
x402
QuantOracle Kelly Criterion Calculator is a paid API for AI agents from api.quantoracle.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Calculates Kelly Criterion position sizing (full, half, and quarter Kelly fractions) given win rate, average win, average loss, and mode
Price / call$0.005
Success—
StatusUnknown
How this service works
QuantOracle: risk/kelly
Output
Returns edge percentage, payoff ratio, full Kelly fraction, half Kelly fraction, quarter Kelly fraction, and a recommended Kelly sizing level (e.g. QUARTER_KELLY) along with response time in milliseconds.
Example use cases
Example prompt
“Using discrete mode, calculate my Kelly position size — my average win is $200, average loss is $100, and my win rate is 55%. Tell me the full, half, and quarter Kelly fractions and which one is recommended.”
Technical details
Endpoint
POSThttps://api.quantoracle.dev/v1/risk/kellyWhen to prefer
Use this endpoint when you need a mathematically rigorous, low-latency Kelly Criterion position sizing calculation for discrete trading outcomes — especially when you have a defined win rate, average win, and average loss. Prefer this over manual calculation or generic finance APIs when you want a structured recommendation (QUARTER_KELLY, HALF_KELLY, FULL_KELLY) alongside edge and payoff metrics. Part of the QuantOracle suite, making it easy to chain with sharpe ratio, regime classification, or full risk analysis endpoints.
Side effects
- win_rate outside 0-1 range returns validation error
- avg_win or avg_loss of zero or negative causes division error
- missing required fields returns 400 bad request
- win_rate of 0 or 1 (no uncertainty) may return degenerate Kelly values
- invalid mode string returns unrecognized mode error
Input
{
"input": {
"body": {
"mode": "discrete",
"avg_win": 200,
"avg_loss": 100,
"win_rate": 0.55
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| mode | string | Calculation mode: discrete (win/loss) or continuous (return series) |
| avg_win | — | Average win amount, required for discrete mode |
| returns | — | Array of historical returns, required for continuous mode |
| avg_loss | — | Average loss amount (positive number), required for discrete mode |
| win_rate | — | Probability of winning (0-1), required for discrete mode |
Output
{
"ms": 9.38,
"edge": 65,
"_meta": {
"url": "https://quantoracle.dev",
"docs": "https://api.quantoracle.dev/docs",
"calculator": "https://quantoracle.dev/kelly-criterion-calculator",
"powered_by": "QuantOracle"
},
"full_kelly": 0.325,
"half_kelly": 0.1625,
"recommended": "QUARTER_KELLY",
"payoff_ratio": 2,
"quarter_kelly": 0.0813
}Tags
x402
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