Korea Payroll & Tax API › litigation-stamp-fee

South Korea civil lawsuit filing costs

South Korea civil lawsuit filing costs: court stamp fee (injidae) from the claim amount by bracket, 1.5x on appeal and 2x at the Supreme Court, 10% off for electronic filing, plus the prepaid service-of-process fee (songdallyo).

Price: $0.05 USDC per call over REST (x402 on Base, no API key). MCP: paid-only — the MCP tool returns payment instructions. Basis year: 2026.

Input

Field	Type	Required	Description
`claimAmount`	number	yes	Amount in dispute (soga) (KRW)
`instance`	first \| appeal \| supreme		Court level; default first
`electronic`	boolean		Filed through the electronic litigation system (10% off the stamp fee); default true
`parties`	integer		Number of parties, for the service fee; default 2

Example request

curl -X POST https://api.kkuldogu.com/v1/litigation-stamp-fee -H "content-type: application/json" \
  -d '{"claimAmount":50000000}'

Without payment this returns 402 with x402 payment requirements; an x402 client pays $0.05 USDC and retries.

Example response

{
  "basisYear": 2026,
  "currency": "KRW",
  "disclaimer": "For reference only, not legal, tax or financial advice. Computed from South Korean statutes and standard formulas as of 2026; reliefs, exemptions and special cases not shown in the result are not modeled, and rules may have changed. Confirm with the relevant office, court, lender or a professional before acting.",
  "source": "https://kkuldogu.com",
  "tool": "litigation-stamp-fee",
  "input": {
    "claimAmount": 50000000
  },
  "result": {
    "stampFee": 207000,
    "stampFeePaperFiling": 230000,
    "serviceFee": 169200,
    "serviceRoundsPerParty": 15,
    "total": 376200,
    "smallClaim": 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