Power your app with Financial Intelligence
Connect to a suite of enterprise-grade financial calculators via our high-performance, developer-first REST API.
curl -X POST
"https://api.fincalculator.pro/v1/mortgage"
-H "x-api-key: YOUR_KEY"
-d '{"principal": 250000}'
Quick Start
2. Make Requests
Include your API key in the Authorization header.
Authorization: Bearer sk-...Example Request
curl -X POST https://fincalculator.pro/api/v1/calculate/mortgage \
-H "Authorization: Bearer sk-your-api-key" \
-H "Content-Type: application/json" \
-d '{
"principal": 300000,
"annual_rate": 6.5,
"loan_term_years": 30
}'Rate Limits
| Tier | Limit | Window |
|---|---|---|
| Starter | 100 requests | per day |
| Professional | 10,000 requests | per month |
| Enterprise | 100,000 requests | per month |
Rate limit headers are included in all responses: X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset
Available Endpoints
Mortgage Calculator
Calculate monthly mortgage payments with amortization schedule
Parameters
Loan EMI Calculator
Calculate loan EMI with full amortization schedule
Parameters
Auto Loan Calculator
Calculate auto loan with trade-in, sales tax, and fees
Parameters
Savings Goal Calculator
Calculate required savings contributions to reach a goal
Parameters
Credit Card Payoff Calculator
Calculate payoff timeline and interest savings
Parameters
Investment Calculator
Calculate investment growth over time
Parameters
Compound Interest Calculator
Calculate compound interest with different frequencies
Parameters
Retirement Calculator
Project retirement savings and income needs
Parameters
Student Loan Calculator
Calculate student loan repayments (Standard or Graduated)
Parameters
Income Tax Calculator
Calculate 2026 Indian income taxes under the new regime
Parameters
SIP Calculator
Calculate future value of systematic investment plans
Parameters
Lumpsum Calculator
Calculate future value of one-time investments
Parameters
GST Calculator
Calculate Indian GST (Net, Gross, and Tax breakup)
Parameters
Profit Margin Calculator
Calculate profit, margin, and markup
Parameters
Break-even Calculator
Calculate units and revenue needed to break even
Parameters
Property Appreciation Calculator
Calculate future property value based on annual appreciation rate
Parameters
Crypto Investment Calculator
Calculate potential crypto returns with high growth scenarios
Parameters
Gold Investment Calculator
Calculate returns on physical or digital gold investments
Parameters
Mutual Fund Calculator
Calculate SIP or Lumpsum returns with expense ratio impact
Parameters
Property Tax Calculator
Calculate estimated annual property taxes
Parameters
Rental Yield Calculator
Calculate gross and net rental yield for investment properties
Parameters
Stamp Duty Calculator
Calculate stamp duty and registration charges for property purchase
Parameters
Response Format
Success Response
{
"success": true,
"data": {
"monthly_payment": 1896.20,
"total_interest": 382632.00,
"amortization_table": [...]
},
"meta": {
"calculation_time_ms": 5,
"version": "1.0"
}
}Error Response
{
"success": false,
"error": "Validation error",
"details": [
{
"field": "principal",
"message": "Required"
}
]
}Status Codes
Financial Knowledge Hub
Browse our calculators and guides organized by financial goals. Disciplined planning starts with the right tools.