# Mart402 Japan Payslip Audit

> Mart402 Japan Payslip Audit is a paid API for AI agents from mart402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).

Recomputes Japanese statutory social insurance premiums and withholding tax from official tables, diffs against actual payslip amounts, and returns per-item match/explainable/mismatch verdicts.

## Facts

- Endpoint: POST https://mart402.com/v1/jp-payslip-audit?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mart402-japan-payslip-audit-833efdac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yEZ424-kQtyVwAIBbzNO9

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mart402-japan-payslip-audit-833efdac -d '<json body>'
```

Example prompt: Can you audit this Japanese payslip for my 45-year-old employee in Tokyo — here's the full payslip data — and tell me if the health insurance, care premium, pension, and withholding tax deductions all match the official statutory tables, or flag any mismatches with an explanation?

## When to prefer this

Use this endpoint when you need to validate a specific monthly payslip against Japan's official statutory insurance and tax tables and get per-item verdicts with explanations — especially for grade revisions or combined care-premium edge cases. Prefer this over the full payroll suite when the payslip already exists and you only need an audit diff, not a net-pay computation from scratch. It is more targeted than the Japan social insurance premiums endpoint alone because it covers withholding tax and produces actionable match/mismatch verdicts rather than just computed values.

## Known failure modes

- Missing required payslip fields returns a validation error
- Invalid or unrecognized prefecture string causes a lookup failure
- Age outside valid working range may produce incorrect grade lookups
- Payslip with non-standard bonus or irregular pay may not be fully covered by audit logic
- Outdated rate tables if statutory tables have changed and service has not been updated

## How this service works

Japan payslip audit: recompute statutory premiums and withholding tax from official tables and diff against the actual amounts. Per-item verdicts (match/explainable/mismatch) that explain grade revisions and combined care-premium notation instead of crying wolf. $0.02/call.

## Output

A structured response containing per-item verdicts (match, explainable, or mismatch) for each payslip deduction line — health insurance, care premium, pension, employment insurance, and withholding tax — along with diffs between recomputed statutory amounts and actual deducted amounts, explanations for grade revisions, and correct combined care-premium notation where applicable.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "age": {
   "type": "number"
  },
  "payslip": {
   "type": "object"
  },
  "prefecture": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mart402-japan-payslip-audit-833efdac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mart402.com](https://www.zero.xyz/host/mart402.com/llms.txt)