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finmath Present Value of Annuity
x402
finmath Present Value of Annuity is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Computes the present value (PV) of an ordinary or due annuity given a fixed periodic payment, number of periods, and interest rate per period.
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
Returns a JSON object with a 'result' field containing the computed present value of the annuity (a single numeric value), and a 'meta' field with supporting metadata about the calculation.
Example use cases
Example prompt
“What's the present value of an annuity that pays $1,200 per month for 60 months at a monthly interest rate of 0.4%? It's an ordinary annuity (payments at end of period).”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/pv_annuityWhen to prefer
Use this endpoint when you need exact, deterministic annuity present value calculations — especially in agentic workflows where LLM arithmetic is unreliable. Ideal for loan valuation, lease pricing, pension lump-sum equivalence, or bond coupon discounting when you already know the periodic payment, number of periods, and rate per period.
Side effects
- Missing required fields (payment, n_periods, rate_per_period) returns a 4xx validation error
- Zero or negative rate_per_period may produce mathematically degenerate results
- Non-positive n_periods returns an error or zero
- Payment request without USDC authorization returns HTTP 402 Payment Required
- Very large n_periods or extreme rates may cause floating-point edge cases
Input
{
"due": false,
"payment": 1200,
"n_periods": 60,
"rate_per_period": 0.004
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| due | boolean | due |
| paymentrequired | number | payment |
| n_periodsrequired | number | n_periods |
| rate_per_periodrequired | number | rate_per_period |
Output
{
"meta": {
"tool": "pv_annuity",
"disclaimer": "Deterministic calculation utility. Not financial, investment, or trading advice.",
"deterministic": true
},
"result": 63898.641384024966
}Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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