finance.openverbs.com publishes 6 machine-payable endpoints over the x402 protocol, priced from $0.004 to $0.004 per call. Each was probed directly; the response code below is what it returned.
| Endpoint | Method | Price | Probe |
|---|---|---|---|
| /v1/future-value | GET | $0.004 | 402 |
| /v1/interest | GET | $0.004 | 402 |
| /v1/irr | GET | $0.004 | 402 |
| /v1/loan | GET | $0.004 | 402 |
| /v1/npv | GET | $0.004 | 402 |
| /v1/present-value | GET | $0.004 | 402 |
Future value of a present sum and/or a level annuity, given a per-period rate and number of periods. Set dueAtBeginning=true for an annuity-due (payments at the start of each period).
Grow a principal by simple or compound interest over a number of years. Compound interest uses compoundsPerYear compounding periods (default 12, monthly).
Internal rate of return (per period) of a series of cash flows, solved with a bounded bisection. Requires at least one positive and one negative flow; flows with no sign change or no bracketable root …
Compute the level monthly payment, total paid and total interest of a fully-amortizing loan. Handles a 0% rate. Set schedule=true to also return the full month-by-month amortization table.
Net present value of a series of cash flows discounted at a per-period rate. cashflows[0] is the time-0 flow (typically the initial outlay, negative).
Present value of a future sum and/or a level annuity, given a per-period rate and number of periods. Set dueAtBeginning=true for an annuity-due.