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T
Tools.Town
Free Online Tools for Everyone

FD Calculator API

Calculate Fixed Deposit maturity value and interest earned — quarterly, monthly, half-yearly, or yearly compounding.

Category: Calculators Endpoint: /v1/calculators/fd Method: POST Auth: API Key

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/calculators/fd

Authentication

This endpoint requires an API Key. Include your API key in the request header.

Authorization: Bearer YOUR_API_KEY
You can get your API key from your dashboard.

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/calculators/fd" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "principal": 500000,
    "annualRate": 8.5,
    "tenureYears": 60
  }'

Example Response 200 OK

application/json
{
  "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