Korea Payroll & Tax API › jeonse-wolse-conversion

Convert between South Korean jeonse deposit and monthly rent (wolse) at a conversion rate, with the statutory 4

Convert between South Korean jeonse deposit and monthly rent (wolse) at a conversion rate, with the statutory 4.5% cap check on a landlord's asked rent.

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

Input

Field	Type	Description
`direction`	jeonse_to_wolse \| wolse_to_jeonse	default jeonse_to_wolse
`jeonseDeposit`	number	Current jeonse deposit (jeonse_to_wolse) (KRW)
`newDeposit`	number	Deposit after conversion (jeonse_to_wolse) (KRW)
`askedMonthlyRent`	number	Rent the landlord asks, to compare with the legal cap (KRW)
`deposit`	number	Current deposit (wolse_to_jeonse) (KRW)
`monthlyRent`	number	Current monthly rent (wolse_to_jeonse) (KRW)
`ratePct`	number	Annual conversion rate in percent; default 4.5 (statutory cap)

Example request

curl -X POST https://api.kkuldogu.com/v1/jeonse-wolse-conversion -H "content-type: application/json" \
  -d '{"jeonseDeposit":300000000,"newDeposit":100000000}'

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": "jeonse-wolse-conversion",
  "input": {
    "jeonseDeposit": 300000000,
    "newDeposit": 100000000
  },
  "result": {
    "monthlyRent": 750000,
    "convertedDeposit": 200000000,
    "annualRent": 9000000,
    "legalCapRatePct": 4.5,
    "legalCapMonthlyRent": 750000
  }
}

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