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Investing Math – Position Size Calculator
x402
Investing Math – Position Size Calculator is a paid API for AI agents from invest-math.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates the number of units to buy, dollars at risk, position cost, and R-multiple profit targets from account size, risk percentage, entry price, and stop-loss price.
Price / call$0.02
Success—
StatusUnknown
How this service works
Position size from account size, risk percent, entry and stop: units to buy, dollars at risk, cost and R-multiple targets.
Output
Returns an object containing: number of units to buy, direction (long/short), stop distance in price and percent, position cost in dollars, budgeted and actual dollar risk, position as a percent of account, whether leverage is needed, 1R/2R/3R profit targets, a plain-language summary, verdict, and optional warnings or reasons if the calculation is degraded or flagged.
Example use cases
Stock trade position sizing
“I'm trading a $50,000 account and want to risk no more than 1% on a stock I'm entering at $85.20 with a stop at $82.00. How many shares should I buy and what will the position cost me?”
Crypto trade with fee adjustment
“I have a $10,000 account and I'm buying crypto at $0.4250 with a stop at $0.3900, risking 2% of my account. Round-trip fees are about 0.5% — how many units should I buy and what are my 1R and 2R targets?”
Checking if leverage is needed
“My account is $5,000, I want to risk 3%, and I'm entering a trade at $320 with a tight stop at $318. Tell me how many shares I can buy and whether I'd need leverage for this position.”
Technical details
Endpoint
GEThttps://invest-math.x402tookit.com/position-size?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a precise, rules-based position size calculation given a specific account size, risk tolerance, entry price, and stop loss — especially when you also want R-multiple profit targets (1R/2R/3R) and a cost breakdown. Prefer this over manual calculation or generic finance APIs when the user is actively planning a trade and needs actionable unit counts and dollar-risk figures in a single call.
Side effects
- Missing required query parameters (account, riskPct, entry, stop) returns an error
- riskPct outside allowed range (0.01–25) may return a validation error or degraded result
- Stop price above entry for a long trade (or below for short) may produce unexpected direction or error
- Very tight stop distances may result in fractional units and a needsLeverage flag
- Non-numeric parameter values return a parsing error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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