# Japan Postal Code Lookup (clonecho/builda)

> Japan Postal Code Lookup (clonecho/builda) is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).

Converts a Japanese postal code into the corresponding prefecture, city, and town names using zipcloud over Japan Post data.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/japan-postal-code-lookup
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/japan-postal-code-lookup-clonecho-builda-7079c010
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0ks_I1k5Mriiw5UINiP78

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 japan-postal-code-lookup-clonecho-builda-7079c010 -d '<json body>'
```

Example prompt: What prefecture, city, and town correspond to Japanese postal code 150-0001?

## When to prefer this

Use this endpoint when you need to resolve a Japanese postal code (7-digit 〒 code) to its prefecture, city, and town components. Ideal for address auto-fill, validation of Japanese addresses, or enriching records that only contain a zip code. Backed by zipcloud over official Japan Post data for accuracy.

## Known failure modes

- Invalid or malformed postal code returns empty results or error JSON
- Postal code not found in Japan Post database returns empty address array
- Missing ?q= parameter may return an error or empty response
- Network timeout or upstream zipcloud outage returns a non-200 response

## How this service works

Japan postal code to prefecture/city/town lookup (zipcloud over Japan Post data) Query: ?q= Returns JSON.

## Output

A JSON object containing the prefecture, city, and town (district/neighborhood) names corresponding to the queried Japanese postal code, sourced from zipcloud over Japan Post data.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/japan-postal-code-lookup-clonecho-builda-7079c010/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)