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agent402.tools IRR Calculator
x402
agent402.tools IRR Calculator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes the internal rate of return (IRR) of a cashflow stream using Newton-Raphson iteration, finding the discount rate at which NPV equals zero.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compute the internal rate of return (IRR) of a cashflow stream - the discount rate at which NPV = 0. Index 0 is treated as t=0 (typically the negative initial investment); indices 1..n are inflows in subsequent periods. Solved via Newton-Raphson with bisection fallback. Requires at least one positive and one negative cashflow (otherwise IRR is undefined). Multiple sign changes in the cashflows can produce multiple IRR roots - we return the first one found.
Output
Returns the computed IRR as a decimal (e.g. 0.18 = 18%) representing the discount rate at which the net present value of the provided cashflow stream equals zero, solved via Newton-Raphson iteration.
Example use cases
Example prompt
“What's the IRR on this investment? The cashflows are: year 0 is -50000, then 12000, 15000, 18000, 20000, and 25000 in years 1 through 5. Use a starting guess of 10%.”
Technical details
Endpoint
POSThttps://agent402.tools/api/irrWhen to prefer
Use this endpoint when you need a quick, accurate IRR calculation for a discrete periodic cashflow stream (e.g. annual project returns, loan schedules) and want server-side Newton-Raphson solving without implementing the algorithm yourself. Ideal for financial agents doing capital budgeting, project evaluation, or loan comparison where IRR is needed as a decision metric.
Side effects
- Cashflow array has fewer than 2 elements — API returns validation error
- No sign change in cashflows (all positive or all negative) — Newton-Raphson cannot converge, returns error
- Newton-Raphson fails to converge with given guess — try a different initial guess value
- Cashflow array exceeds 1200 elements — returns payload too large error
- Payment of 0.001 USDC not fulfilled — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| guess | number | Initial guess for IRR as decimal (default 0.1 = 10%). Used as the Newton-Raphson starting point. |
| cashflows | array | Array of cashflows. Index 0 = t=0. Must contain at least one positive and one negative value. 2-1200 elements. |
Output
Schema · Response
{
"type": "json",
"example": {
"irr": 0.248883,
"npvAtIrr": 0,
"converged": true,
"iterations": 6
}
}Tags
x402
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