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Loan Payment

by Loan payment in Markets & finance

x402 APIPassing, checked 3 h ago

Compute the monthly (or per-period) payment on a fully-amortizing loan: mortgage, auto, student loan, business loan. Returns the periodic payment, total paid over the term, and total interest. Matches Excel's PMT(rate, nper, -principal). Use this when you just need the payment number, not the full per-period schedule (see amortization).

POST https://agent402.tools/api/loan-payment

Last 30 days

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Uptime
100%
Response time
187 ms typical, 193 ms slowest 5%
Last check
3 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://agent402.tools/api/loan-payment" \
  -H "content-type: application/json" \
  -d '{"annualRate":0.06,"principal":200000,"termYears":30}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Floan-payment
const res = await pay("https://agent402.tools/api/loan-payment", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"annualRate":0.06,"principal":200000,"termYears":30}),
});
console.log(await res.json());

Example input

{
  "annualRate": 0.06,
  "principal": 200000,
  "termYears": 30
}

Example output

{
  "payment": 1199.1,
  "periodicRate": 0.005,
  "periods": 360,
  "totalInterest": 231676.38,
  "totalPaid": 431676.38
}

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