Korea Payroll & Tax API › pyeong-conversion

Convert between square meters and pyeong, the Korean real-estate area unit (1 pyeong = 400/121 m2, about 3

Convert between square meters and pyeong, the Korean real-estate area unit (1 pyeong = 400/121 m2, about 3.3058 m2).

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

Input

Example request

curl -X POST https://api.kkuldogu.com/v1/pyeong-conversion -H "content-type: application/json" \
  -d '{"value":84}'

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": "pyeong-conversion",
  "input": {
    "value": 84
  },
  "result": {
    "pyeong": 25.41,
    "squareMeters": 84,
    "squareSideMeters": 9.2
  }
}

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