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Japanese Postal Code Address Lookup
x402
Japanese Postal Code Address Lookup is a paid API for AI agents from address.agentic-jp.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Look up Japanese address candidates (prefecture, city, town, chome-banchi) by 7-digit postal code using Japan Post KEN_ALL data
Price / call$0.001
Success—
StatusUnknown
How this service works
Look up Japanese (JP) address candidates for a 7-digit postal code (郵便番号), backed by the official Japan Post KEN_ALL dataset. One postal code can map to several towns; all candidates are returned with kana readings. Use for address autofill and postal-code validation.
Output
Returns one or more Japanese address candidates for the given postal code, including decomposed components: prefecture (都道府県), city (市区町村), town (町域), and chome-banchi notation. Includes a 0-1 confidence score and normalizes fullwidth/halfwidth digit variants and old-form kanji.
Example use cases
Example prompt
“What Japanese address does postal code 1000001 correspond to? I need the prefecture, city, and town components.”
Technical details
Endpoint
GEThttps://address.agentic-jp.com/postal-code/:zipWhen to prefer
Use this endpoint when you need to resolve a Japanese 7-digit postal code to structured address components backed by authoritative Japan Post KEN_ALL data. Prefer this over generic geocoding APIs when working specifically with Japanese postal codes and needing clean prefecture/city/town decomposition with a confidence score for validation pipelines.
Side effects
- Invalid or non-existent postal code returns empty candidates or error
- Postal code with wrong digit count (not 7 digits) may return 400 or empty result
- Ambiguous postal codes covering multiple towns may return multiple candidates
- Network timeout or service unavailability returns 5xx error
- Hyphen formatting edge cases may cause parse errors if not handled
Input
{
"input": {
"type": "http",
"method": "GET",
"pathParams": {
"zip": "1000001"
}
}
}Output
{
"candidates": [
{
"city": "千代田区",
"town": "千代田",
"city_kana": "チヨダク",
"town_kana": "チヨダ",
"prefecture": "東京都",
"prefecture_kana": "トウキョウト"
}
],
"postal_code": "100-0001"
}Tags
x402
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