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finmath XIRR Calculator
x402
finmath XIRR 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).
Computes the Extended Internal Rate of Return (XIRR) for irregular cash flow series with exact, deterministic arithmetic
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 JSON object with a 'result' field containing the XIRR as a decimal (annualized rate of return) and a 'meta' object with computation details such as iteration count or convergence information.
Example use cases
Example prompt
“Calculate the XIRR for an investment where I put in $10,000 on 2021-01-15, received $2,500 on 2021-08-20, got $4,000 on 2022-03-10, and finally $6,000 on 2023-06-01 — what's my annualized rate of return?”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/xirrWhen to prefer
Use this endpoint when you need exact, deterministic XIRR computation for cash flows occurring on irregular dates — especially when LLM arithmetic would be unreliable. Prefer it over generic IRR calculators when dates are non-periodic (e.g., private equity distributions, real estate cash flows, VC investments, personal investment tracking). Ideal for AI agents that need a single authoritative numeric result they can trust without verification.
Side effects
- No sign change in cash flows (all positive or all negative) — XIRR cannot converge, returns error
- Insufficient data points — fewer than two dated cash flows provided
- Date and cashflow arrays of mismatched length — returns validation error
- Non-convergence if cash flows are pathological — algorithm fails to find a root
- Invalid date format in dates array — returns parse error
- Payment required (402) if USDC payment header is missing or insufficient
Input
{
"dates": [
"2023-01-01",
"2023-06-30",
"2024-01-01"
],
"cashflows": [
-10000,
5000,
6000
]
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| datesrequired | array | dates |
| cashflowsrequired | array | cashflows |
Output
{
"meta": {
"tool": "xirr",
"disclaimer": "Deterministic calculation utility. Not financial, investment, or trading advice.",
"deterministic": true
},
"result": 0.1325637870716075
}Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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