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Neuroterminal Position Size Calculator
x402
Neuroterminal Position Size Calculator is a paid API for AI agents from api.neuroterminal.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Computes optimal bet/trade position size using the Kelly Criterion given win probability, win/loss amounts, and available capital
Price / call$0.01
Success—
StatusUnknown
How this service works
Paid HTTP endpoints for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — pay per call.
Output
Returns a JSON object with: a verdict string (e.g. 'positive edge'), the full Kelly fraction, a suggested stake in dollar amount, a fractional Kelly value (typically half-Kelly for conservative sizing), and the break-even win rate required for the bet to have positive expected value.
Example use cases
Optimal stock trade sizing
“I'm considering a trade where I estimate a 65% chance of winning, the upside is $800, the downside is $400, and I have $20,000 in capital — what's the Kelly Criterion optimal position size and fractional Kelly stake I should use?”
Sports bet bankroll management
“I want to bet on a game where I think there's a 55% chance of winning, the payout is $150 for every $100 I risk, and my bankroll is $5,000 — calculate the Kelly fraction and tell me how much I should wager.”
Options trade risk sizing
“Help me size an options position: I have $15,000 available, I estimate a 70% probability of success, my max gain is $2,000, and my max loss is $600 — what does Kelly say my stake should be, and what's the break-even win rate?”
Technical details
Endpoint
GEThttps://api.neuroterminal.xyz/v1/position-sizeWhen to prefer
Choose this endpoint when you need a mathematically rigorous, Kelly Criterion-based position sizing recommendation without setting up an account or API key. Ideal for agents handling trading, betting, or any capital allocation task where the user knows their edge (win probability) and payoff structure. At $0.01 per call via USDC on Base, it's suitable for on-demand, per-decision use rather than high-frequency bulk calculations.
Side effects
- Missing required parameters winProbability or winAmount returns a 400 error
- Win probability outside 0-1 range may return invalid results or error
- Negative capital or amounts may produce unexpected output
- Network or payment failure via x402 protocol returns 402 Payment Required
- Server unavailability returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"verdict": "positive edge",
"kellyFraction": 0.2,
"suggestedStake": 1000,
"fractionalKelly": 0.1,
"breakEvenWinRate": 0.5
}
}Tags
x402
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