# HeartRails Express Japan Railway Station Lookup

> HeartRails Express Japan Railway Station Lookup 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).

Search Japanese railway stations by name, returning prefecture, rail line, and postal code information

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/heartrails-jp-stations
- 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/heartrails-express-japan-railway-station-lookup-3928cdd6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x2i4R5_W13qUrzGlgMSFu

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 heartrails-express-japan-railway-station-lookup-3928cdd6 -d '<json body>'
```

Example prompt: Can you find the Japanese railway station called 'Shinjuku' and tell me which prefecture it's in, what rail lines serve it, and its postal code?

## When to prefer this

Use this endpoint when you need to look up Japanese railway station metadata — specifically prefecture, rail line, and postal code — by station name. Ideal for transit routing apps, address enrichment with postal codes, or geographic lookups of stations within Japan. Not suitable for real-time train schedules, fare information, or non-Japanese rail systems.

## Known failure modes

- No stations found for the given query string — returns empty results array
- Query parameter missing — may return error or all stations
- Station name ambiguous — returns multiple matches across different lines and prefectures
- API unavailable or payment failure — HTTP 402 or 5xx error

## How this service works

Japan (HeartRails Express API): railway stations matching a name, with prefecture, line and postal code. Query: ?q= Returns JSON.

## Output

A JSON array of railway stations matching the query, each containing the station name, prefecture, rail line name, and postal code.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/heartrails-express-japan-railway-station-lookup-3928cdd6/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)