Finance tools your app doesn't have to build

curl -X POST https://toolknife.com/api/v1/tools/mortgage-calculator_monthly-payment \
  -H "Content-Type: application/json" \
  -d '{"principal": 360000, "annualRate": 6.5, "years": 30}'

# Response:
# { "monthlyPayment": 2275.44, "totalInterest": 459158.40, "totalCost": 819158.40 }

import requests

BASE = "https://toolknife.com/api/v1/tools"

# NPV of a project
npv = requests.post(f"{BASE}/npv-calculator_calculate", json={
    "rate": 10,
    "initialInvestment": 100000,
    "cashFlows": [30000, 35000, 40000, 45000, 50000],
}).json()["result"]

# Compound interest projection
growth = requests.post(f"{BASE}/compound-interest-calculator_calculate", json={
    "principal": 10000,
    "rate": 7,
    "time": 20,
    "compoundingFrequency": 12,
}).json()["result"]

print(f"NPV: ${npv['npv']:,.2f}")
print(f"Future value: ${growth['futureValue']:,.2f}")

const res = await fetch(
  "https://toolknife.com/api/v1/tools/currency-converter_convert",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ amount: 1000, from: "USD", to: "EUR" }),
  }
);

const { result } = await res.json();
console.log(`${result.amount} ${result.from} = ${result.converted} ${result.to}`);
// Rate from ECB, updated every 4 hours