# Japanese Postal Code to Address Lookup (jp-data-api)

> Japanese Postal Code to Address Lookup (jp-data-api) is a paid API for AI agents from jp-data-api-production.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Converts a 7-digit Japanese postal code (zip) into structured address components: prefecture, city, and town in kanji, kana reading, and Hepburn romaji

## Facts

- Endpoint: GET https://jp-data-api-production.up.railway.app/address/normalize
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/japanese-postal-code-to-address-lookup-jp-data-api-75454f89
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9P0Ga0TgycpoUA_l-VBXR

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 japanese-postal-code-to-address-lookup-jp-data-api-75454f89
```

Example prompt: Can you look up the Japanese address for postal code 1000001 and give me the prefecture, city, and town name in both kanji and romaji?

## When to prefer this

Use this endpoint when you need to resolve, validate, or autofill Japanese addresses from a postal code, especially when you need multi-script output (kanji, kana, romaji). Prefer it over generic geocoding APIs when the specific requirement is Japan postal code structure with kana/romaji support for e-commerce, logistics, or KYC workflows.

## Known failure modes

- Invalid or non-existent 7-digit zip code returns an error or empty result
- Zip code with fewer or more than 7 digits rejected as malformed
- Zip code for a newly created or updated postal district may not be in the dataset
- Network timeout or Railway hosting downtime returns HTTP 5xx

## How this service works

Japanese address validation and postal code lookup: 7-digit zip to prefecture/city/town with kana reading and Hepburn romaji. Use for shipping address verification, e-commerce checkout to Japan, logistics, KYC identity verification, CRM data cleaning, form autofill.

## Output

Returns the full address breakdown for the given Japanese postal code, including prefecture, city, and town names in kanji, their kana readings, and Hepburn romaji transliterations — suitable for shipping forms, KYC verification, or CRM enrichment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "zip"
     ],
     "properties": {
      "zip": {
       "type": "string",
       "description": "7-digit postal code"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/japanese-postal-code-to-address-lookup-jp-data-api-75454f89/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from jp-data-api-production.up.railway.app](https://www.zero.xyz/host/jp-data-api-production.up.railway.app/llms.txt)