Tool detail

Mart402

Calculates Japan consumption tax: per-rate invoice rounding, qualified-invoice field validation, simplified taxation, or the 20-percent special scheme.

Categories: Utilities

Use when

calculate Japan consumption tax invoice rounding for a sale
validate a qualified invoice's tax fields under Japan's T+13 rules
check eligibility and amount under Japan's 20-percent special scheme

Not for

not general tax advice — deterministic calculation against stated rules only

Inputs

POST JSON body, all optional: mode (string), taxable_period_start/end (string), taxable_sales_excl_yen (number)

Admitted input schema

{
  "type": "object",
  "properties": {
    "mode": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096
    },
    "taxable_period_end": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096
    },
    "taxable_period_start": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096
    },
    "taxable_sales_excl_yen": {
      "type": "number",
      "minimum": -9007199254740991,
      "maximum": 9007199254740991
    }
  },
  "required": [],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://mart402.com/v1/jp-consumption-tax

Payment

Protocol: x402
Listed price: 0.01 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://mart402.com/v1/jp-consumption-tax
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z