API Endpoint

APR Estimate

Calculate effective annual percentage rate (APR) from nominal rate and fees.

Endpoint

POST https://likeoptions.com/api/v1/calculate/apr

Also supports GET with query parameters.

Parameters

Parameter	Type	Default	Description
`amount`	number	—	Loan amount ($)
`fees`	number	—	Total fees and closing costs ($)
`nominalRate`	number	—	Nominal annual rate (%)
`months`	number	—	Loan term (months)

Request Examples

POST (JSON body)

curl -X POST https://likeoptions.com/api/v1/calculate/apr \
  -H "Content-Type: application/json" \
  -d '{"amount": 100000, "fees": 50000, "nominalRate": 6}'

GET (query parameters)

curl "https://likeoptions.com/api/v1/calculate/apr?amount=100000&fees=50000&nominalRate=6"

Response

{
  "kind": "apr",
  "result": {
    "primary": 1234.56,
    "secondary": [
      { "label": "Example metric", "value": 100, "format": "money" },
      { "label": "Example percent", "value": 5.5, "format": "percent" }
    ]
  }
}

When to Use

Compare true cost of loans
Understand fee impact
Calculate effective rate

Error Handling

400 Bad Request — Invalid input parameters or missing required fields
404 Not Found — Unknown calculator kind
429 Too Many Requests — Rate limit exceeded (120 req/hour per IP)
413 Payload Too Large — Request body exceeds 16 KB

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