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Exact Financial & Token Math Calculator
x402
Exact Financial & Token Math Calculator is a paid API for AI agents from api.webbersites.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Performs precise financial computations (compound interest, loan amortization, NPV, IRR) and exact token unit conversions using BigInt arithmetic to avoid floating-point errors
Price / call$0.005
Success—
StatusUnknown
How this service works
Exact financial + token math. POST {op:…}: compound (growth with per-period contributions), amortize (payment, total interest, schedule), npv, irr (deterministic bisection) — and token_units: exact decimal↔base-unit conversion via BigInt for any token decimals (ETH 18, USDC 6), the 18-decimal math that float64 silently corrupts. Iterative series computed exactly, never guessed.
Output
Returns exact numerical results for the requested financial operation: for compound, the final balance; for amortize, the periodic payment, total interest, and full amortization schedule; for npv, the net present value; for irr, the internal rate of return via bisection; for token_units, the precise decimal or base-unit representation as a BigInt-accurate string.
Example use cases
Example prompt
“Calculate the amortization schedule for a $250,000 loan at 6.5% annual interest over 30 years with monthly payments — I want the monthly payment amount and total interest paid.”
Technical details
Endpoint
POSThttps://api.webbersites.com/api/calc/financeWhen to prefer
Choose this endpoint when you need mathematically exact financial calculations — especially for crypto token unit conversions where float64 precision loss would corrupt 18-decimal values (ETH, USDC), or when you need a full amortization schedule, compound growth with contributions, NPV, or deterministic IRR that a general-purpose LLM might approximate incorrectly.
Side effects
- Missing or unrecognized 'op' field returns an error
- Invalid or missing required fields for the chosen operation (e.g. no principal for amortize)
- cashflows array empty or missing for npv/irr operations
- IRR bisection fails to converge for pathological cash flow series
- token_units called without specifying 'to', 'amount', or 'decimals'
- Payment failure or x402 protocol error if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"op": "amortize",
"periods": 360,
"total_interest": 382633.47,
"payment_per_period": 1896.2
}
}Tags
x402
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