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finmath Perpetual Futures Liquidation Price Calculator
x402
finmath Perpetual Futures Liquidation Price Calculator is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Calculates the liquidation price for a perpetual futures (perp) position given side, leverage, entry price, and optional maintenance margin rate
Price / call$0.002
Success—
StatusUnknown
How this service works
Deterministic finance and crypto math for AI agents: TradFi (NPV, IRR, XIRR, Black-Scholes + Greeks, bonds, VaR, Sharpe) and DeFi (impermanent loss, perp liquidation, funding, Uniswap v3, health factor, cost basis). Exact, model-free arithmetic that LLMs get wrong — priced per call in USDC.
Output
Returns a result object containing the computed liquidation price for the perpetual futures position, along with a meta object containing calculation details such as the model used and input echo.
Example use cases
Example prompt
“I opened a long perp position on BTC at an entry price of $65,000 with 10x leverage — what's my liquidation price? Use a 0.5% maintenance margin rate.”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/perp_liquidation_priceWhen to prefer
Use this endpoint when you need exact, deterministic liquidation price arithmetic for perpetual futures positions — especially when an LLM's approximation is unacceptable for risk management decisions. Prefer this over manual calculation or LLM estimation when precision matters for trading safety or automated risk alerts.
Side effects
- Missing required fields (side, leverage, entry_price) returns 400 error
- Invalid side value (not 'long' or 'short') causes computation error
- Leverage of 0 or negative causes division error
- Entry price of 0 or negative is invalid
- Maintenance margin rate outside 0-1 range may produce nonsensical result
- Payment of 0.002 USDC not provided results in 402 Payment Required
Input
{
"side": "long",
"leverage": 10,
"entry_price": 50000,
"maintenance_margin_rate": 0.05
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| siderequired | string | side |
| leveragerequired | number | leverage |
| entry_pricerequired | number | entry_price |
| maintenance_margin_rate | number | maintenance_margin_rate |
Output
{
"meta": {
"tool": "perp_liquidation_price",
"model": true,
"disclaimer": "Deterministic calculation utility. Not financial, investment, or trading advice.",
"assumptions": [
"isolated margin",
"linear (USDT-margined) contract",
"excludes fees and funding",
"single flat maintenance-margin rate (real venues use tiers)"
],
"deterministic": true
},
"result": {
"assumptions": "isolated margin, linear contract, excludes fees/funding, flat MMR",
"distance_pct": -0.05,
"liquidation_price": 47500
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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