FD Calculator API
Calculate Fixed Deposit maturity, total interest, and full year-by-year schedule with RBI-aligned quarterly compounding.
Fast & Accurate
Get precise results instantly.
Easy Integration
Simple REST API with JSON response.
Developer Friendly
Clear docs and SDK examples.
Free to Start
1,000 free requests/month.
Endpoint
All requests should be made to the following endpoint:
POST https://api.tools.town/v1/finance/fd-calculator Authentication
This endpoint requires an API Key. Include your API key in the request header.
Request Parameters
Send a POST request with JSON body.
| Parameter | Type | Required | Description | Example |
|---|---|---|---|---|
principal | number | ✓ | Principal must be greater than zero. | 500000 |
annualRate | number | ✓ | Rate cannot be negative. | 8.5 |
tenureYears | number | ✓ | Tenure must be greater than zero. | 60 |
compounding | enum | ✕ | The compounding parameter. | quarterly |
payoutMode | enum | ✕ | The payoutMode parameter. | cumulative |
Example Request
curl -X POST "https://api.tools.town/v1/finance/fd-calculator" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"principal": 500000,
"annualRate": 8.5,
"tenureYears": 60
}' Example Response 200 OK
{
"success": true,
"data": {
"principal": "0",
"annualRate": "0",
"tenureYears": "0",
"compounding": "string",
"payoutMode": "string",
"n": "0",
"totalInterest": "0",
"maturityAmount": "0"
}
} Error Codes
| Code | Meaning |
|---|---|
| 400 | Bad Request — missing or invalid parameter |
| 401 | Unauthorized — API key missing or invalid |
| 429 | Rate limit exceeded — free tier: 1,000 requests/month |
| 500 | Internal Server Error — try again or contact support |