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finmath – Deterministic Finance & Crypto Math API
x402
finmath – Deterministic Finance & Crypto Math API is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Computes exact financial and DeFi math (NPV, IRR, Black-Scholes, Greeks, bond pricing, VaR, Sharpe, impermanent loss, Uniswap v3, perp liquidation, health factor, cost basis) via a JSON-in/JSON-out API, billed per call in USDC.
Price / call$0.001
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
A JSON object with a 'result' field containing the computed financial value(s) (e.g. option price, Greeks, NPV, IRR, impermanent loss percentage, liquidation price, etc.) and a 'meta' field with request metadata such as the calculation type and input echo.
Example use cases
Example prompt
“Calculate the Black-Scholes price and all Greeks for a European call option where spot is 150, strike is 155, risk-free rate is 5%, volatility is 25%, and time to expiry is 0.5 years — give me the result as JSON.”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/json_formatWhen to prefer
Choose this endpoint when you need deterministic, exact financial arithmetic that LLMs are unreliable at — especially for options pricing, Greeks, DeFi impermanent loss, perp liquidation, or IRR/XIRR on irregular cash flows. Prefer this over asking the LLM directly whenever numerical precision matters, and over general-purpose code execution when you want a hosted, per-call-priced, schema-driven math service covering both TradFi and DeFi in a single API.
Side effects
- Malformed or invalid JSON in the 'json' field returns an error result
- Missing required calculation parameters (e.g. no strike price for options) causes a computation error
- Unsupported calculation type in the formula spec returns an unknown-mode error
- Payment failure or insufficient USDC balance results in HTTP 402 before computation
- Numeric edge cases (e.g. zero volatility, negative time to expiry) may return NaN or error
Input
{
"json": "{\"operation\": \"npv\", \"rate\": 0.05, \"cashflows\": [100, 100, 100]}",
"mode": "default",
"indent": 2
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| jsonrequired | string | json |
| mode | string | mode |
| indent | number | indent |
Output
{
"meta": {
"tool": "json_format",
"disclaimer": "Deterministic calculation utility. Not financial, investment, or trading advice.",
"deterministic": true
},
"result": {
"result": "{\n \"operation\": \"npv\",\n \"rate\": 0.05,\n \"cashflows\": [\n 100,\n 100,\n 100\n ]\n}"
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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