mart402.com

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "docs": {
    "llms": "https://mart402.com/llms.txt",
    "agent_guide": "https://mart402.com/agents.md",
    "free_sandbox": "https://mart402.dev",
    "sample_output": "https://mart402.com/samples/jp-retirement-tax",
    "payment_examples": "https://github.com/tanaka-77/mart402-agent-kit"
  },
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188",
      "amount": "20000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://mart402.com/v1/jp-retirement-tax",
      "description": "Japan retirement income tax: deduction by years of service, half-taxation with short-term/officer exceptions, exact withholding rounding (1-yen floor), resident tax 6+4 percent split. $0.02/call.",
      "outputSchema": {
        "input": {
          "body": {
            "payout_yen": 20000000,
            "years_of_service": 30
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "discoverable": true
        },
        "output": {
          "description": "JSON: deduction, taxable, income tax, resident tax, net payout, half-taxation flag"
        }
      },
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://mart402.com/v1/jp-retirement-tax",
    "mimeType": "application/json",
    "description": "Japan retirement income tax: deduction by years of service, half-taxation with short-term/officer exceptions, exact withholding rounding (1-yen floor), resident tax 6+4 percent split. $0.02/call.",
    "serviceName": "Mart402"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "payout_yen": 20000000,
            "years_of_service": 30
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "ok": true,
            "note": "SAMPLE RESPONSE generated by the exact deterministic engine that serves production (jp-statutory has no LLM: same input always produces this byte-identical result, carrying the same rules_version and cited primary sources). Served free at /samples/{product} so you can verify the response shape, the rules_version field and the source citations before paying. No payment was taken. The sample_input shown is the catalog example input that produced this output.",
            "tool": "jp-retirement-tax",
            "as_of": null,
            "result": {
              "net_yen": 19594298,
              "taxable_yen": 2500000,
              "deduction_yen": 15000000,
              "half_taxation": true,
              "income_tax_yen": 155702,
              "resident_tax_yen": 250000
            },
            "sample": true,
            "sources": [
              "https://www.nta.go.jp/publication/pamph/gensen/zeigakuhyo2026/data/17-18.pdf",
              "https://www.nta.go.jp/taxes/shiraberu/taxanswer/shotoku/2260.htm",
              "https://www.tax.metro.tokyo.lg.jp/kazei/kojin_ju.html"
            ],
            "summary": "退職金20,000,000円(勤続30年) -> 手取り19,594,298円(退職所得控除15,000,000円・所得税155,702円・住民税250,000円)",
            "billable": true,
            "breakdown": [],
            "disclaimer": "仮定条件に基づく概算試算。税務相談・手続代行・法律相談ではない。申告・届出への使用不可。確定額は官公署または税理士・社会保険労務士等に確認のこと。",
            "assumptions": [],
            "not_covered": [
              "106万円の壁の2026年以降の要件見直し",
              "乙欄・丙欄",
              "住宅ローン控除以外の税額控除",
              "分離課税(株式・不動産譲渡)",
              "合計所得2350万円超の基礎控除逓減",
              "固定残業代の有効性判断",
              "変形労働時間制",
              "年の中途の年末調整",
              "従たる給与",
              "扶養手当等の企業independent基準",
              "日額表",
              "管理監督者の判定",
              "自治体独自の超過課税(横浜市・名古屋市等)",
              "裁量労働制",
              "非居住者・年の中途入退社の年調"
            ],
            "sample_input": {
              "payout_yen": 20000000,
              "years_of_service": 30
            },
            "rules_version": "2026.08.18",
            "carried_forward": [],
            "unverified_rules": []
          },
          "description": "JSON: deduction, taxable, income tax, resident tax, net payout, half-taxation flag"
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "properties": {
                  "payout_yen": {
                    "type": "number"
                  },
                  "years_of_service": {
                    "type": "number"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "offer-receipt": {
      "info": {
        "offers": [
          {
            "format": "jws",
            "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6ImRpZDp3ZWI6bWFydDQwMi5jb20ja2V5LTEifQ.eyJhbW91bnQiOiIyMDAwMCIsImFzc2V0IjoiMHg4MzM1ODlmQ0Q2ZURiNkUwOGY0YzdDMzJENGY3MWI1NGJkQTAyOTEzIiwibmV0d29yayI6ImVpcDE1NTo4NDUzIiwicGF5VG8iOiIweEUzMjQ0YTIxRDBkNjhiRmE3OGI3Q0FkOEMzYjg3NzdhREZiQjMxODgiLCJyZXNvdXJjZVVybCI6Imh0dHBzOi8vbWFydDQwMi5jb20vdjEvanAtcmV0aXJlbWVudC10YXgiLCJzY2hlbWUiOiJleGFjdCIsInZhbGlkVW50aWwiOjE3OTA2NjI4MzMsInZlcnNpb24iOjF9.-76Qum2I3JyOKpjwXg4jtrG_zzhl9ytoiSkj4jj9fSRm41GzRWjnipdd_BUmaa19drw3scEqOtw15-tttuv-CA",
            "acceptIndex": 0
          }
        ]
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "offers"
        ],
        "properties": {
          "offers": {
            "type": "array",
            "items": {
              "type": "object",
              "required": [
                "format",
                "signature"
              ],
              "properties": {
                "format": {
                  "type": "string",
                  "const": "jws"
                },
                "signature": {
                  "type": "string",
                  "description": "JWS compact serialization containing the offer payload"
                },
                "acceptIndex": {
                  "type": "integer"
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://mart402.com/v1/jp-retirement-tax",
    "description": "",
    "maxAmountRequired": "20000",
    "maxTimeoutSeconds": 120
  }
]

Provenance

Seen in the source catalog

2026-10-19 16:31Z

Last indexed by Roundhouse

2026-10-24 05:45Z

Last enriched (probe, favicon, geo)

2026-09-29 06:15Z

x402 version

1

Max timeout

120s

Liveness probe

HTTP 402