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Vextorium Perpetual Futures Position Calculator
x402
Vextorium Perpetual Futures Position Calculator is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-19).
Calculates perpetual futures position metrics including liquidation price, PnL at stop-loss/take-profit, notional value, and reward-risk ratio given entry price and leverage
Price / call$0.004
Success—
StatusUnknown
How this service works
Perpetual futures calculator (isolated margin): liquidation price and distance, notional and size, PnL at stop-loss and take-profit, reward/risk ratio, and position sizing to risk a fixed USD amount.
Output
Returns a JSON object with the computed position side, entry price, leveraged notional value, position size in base asset, margin posted, liquidation price, liquidation distance as a percentage, PnL and PnL-as-percentage-of-margin at stop-loss price, PnL and PnL-as-percentage-of-margin at take-profit price, and reward-risk ratio. Includes a disclaimer note that the calculation assumes isolated margin with no fees or funding and is an estimate.
Example use cases
Pre-trade risk check for a long position
“I'm thinking about going long on ETH at $3,200 with 20x leverage and $200 margin. My stop loss is at $3,100 and take profit at $3,600. Can you calculate my liquidation price, how much I'd lose at stop loss, and what my reward-risk ratio is?”
Risk-based position sizing for a short trade
“I want to short BTC at $65,000 with 15x leverage and I only want to risk $75. My stop loss is at $66,500. Size my position based on that risk amount and tell me my liquidation price and distance.”
Liquidation distance check before placing trade
“If I go short at $3,500 with 50x leverage posting $50 in margin, what's my liquidation price and how far is it from my entry as a percentage? Maintenance margin is the default 0.5%.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/perp-calculator?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or trader needs to quickly compute perpetual futures position risk metrics — especially liquidation price, PnL scenarios, and reward-risk ratio — before placing a trade. Ideal for pre-trade analysis workflows, position sizing by risk amount, and sanity checks on leverage. Prefer this over manual calculation when the user specifies entry price, leverage, and optional stop/take-profit levels for isolated-margin perp trades.
Side effects
- Missing required fields (entry price or leverage) returns a validation error
- Leverage outside the 1-200 range may return an error or unexpected results
- Inconsistent stop-loss/take-profit direction relative to side (e.g. stop-loss above entry for a long) may yield negative or nonsensical PnL values
- Neither margin nor risk_usd provided may result in incomplete sizing calculation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| side | string | |
| input | number | Entry price |
| margin | number | Margin posted in USD (optional) |
| leverage | number | Leverage (1-200) |
| risk_usd | number | USD to risk; with stop_loss, sizes the position |
| stop_loss | number | Stop-loss price (optional) |
| take_profit | number | Take-profit price (optional) |
| maintenance_margin_pct | number | Maintenance margin % (default 0.5) |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Isolated margin, no fees or funding. Each exchange rounds differently: use it as an estimate.",
"side": "long",
"input": 60000,
"amount": 0.01666667,
"margin": 100,
"leverage": 10,
"notional": 1000,
"in_stop_loss": {
"pnl": -50,
"price": 57000,
"pnl_pct_of_margin": -50
},
"in_take_profit": {
"pnl": 100,
"price": 66000,
"pnl_pct_of_margin": 100
},
"liquidation_price": 54271.35678392,
"reward_risk_ratio": 2,
"liquidation_distance_pct": 9.5477
}
}Tags
x402
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