Korea Payroll & Tax API › wage-conversion

Convert between hourly wage, monthly salary and annual salary the South Korean way (monthly hours include paid weekly holiday hours, 209 for a 40-hour week), with a 2026 minimum wage check

Convert between hourly wage, monthly salary and annual salary the South Korean way (monthly hours include paid weekly holiday hours, 209 for a 40-hour week), with a 2026 minimum wage check.

Price: $0.01 USDC per call over REST (x402 on Base, no API key). MCP: free as wage_conversion at https://api.kkuldogu.com/mcp. Basis year: 2026.

Input

Field	Type	Required	Description
`amount`	number	yes	Wage amount in the given unit (KRW)
`unit`	hourly \| monthly \| annual		Unit of amount; default hourly
`weeklyHours`	number		Contracted hours per week; default 40

Example request

curl -X POST https://api.kkuldogu.com/v1/wage-conversion -H "content-type: application/json" \
  -d '{"amount":3000000,"unit":"monthly"}'

Without payment this returns 402 with x402 payment requirements; an x402 client pays $0.01 USDC and retries.

Example response

{
  "basisYear": 2026,
  "currency": "KRW",
  "disclaimer": "For reference only, not legal or tax advice. Uses official 2026 Korean rates and the same formulas as the kkuldogu.com calculators; actual payroll, NHIS/NPS notices and tax settlement can differ.",
  "source": "https://kkuldogu.com",
  "tool": "wage-conversion",
  "input": {
    "amount": 3000000,
    "unit": "monthly"
  },
  "result": {
    "monthlyHours": 209,
    "weeklyHolidayHours": 8,
    "hourly": 14354,
    "daily8h": 114833,
    "weekly": 688995,
    "monthly": 3000000,
    "annual": 36000000,
    "minimumWage": 10320,
    "belowMinimumWage": false
  }
}

For reference only, not legal or tax advice. Uses official 2026 Korean rates and the same formulas as the kkuldogu.com calculators; actual payroll, NHIS/NPS notices and tax settlement can differ. · Calculators for people (Korean): kkuldogu.com · API home · llms.txt · OpenAPI