# Japan Postal Code Lookup

> Resolve Japanese 〒 postcodes to prefecture, city and town — batch lookups for your AI agent.

Remote MCP server (Streamable HTTP): https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp
Free tier: `postal_lookup` — no key, no sign-up, 20 calls/day per IP.
Pro: ¥900/month, cancel anytime — all tools, unlimited.

## Tools
- postal_lookup (free): FREE. Resolve a 7-digit Japanese postcode to prefecture/city/town.
- batch_postal (Pro): PRO. Resolve up to 50 Japanese postcodes.
- all_matches (Pro): PRO. All address matches for one postcode (some codes span multiple towns).

## Buying (agents)
1. POST https://jp-postal-lookup-mcp.donniertf.workers.dev/checkout -> {checkout_url, session_id}. A human (or a payment-capable agent) completes Stripe Checkout at checkout_url.
2. GET https://jp-postal-lookup-mcp.donniertf.workers.dev/token?session_id=... -> {access_token}.
3. Send Authorization: Bearer <access_token> to https://jp-postal-lookup-mcp.donniertf.workers.dev/mcp (or pass access_token in tool arguments).

## Pay per call (x402, USDC on Base)
No account: POST JSON args to https://jp-postal-lookup-mcp.donniertf.workers.dev/x402/<tool> -> HTTP 402 with payment requirements ($0.02 USDC per call, payTo 0x02226D28e0c85AE4AdDB7fe7043Dd2b1Ff710D41). Retry with an X-PAYMENT header (x402 v1, scheme exact, network base). Manifest: https://jp-postal-lookup-mcp.donniertf.workers.dev/.well-known/x402. MCP clients may also send X-PAYMENT on tools/call.
Machine-readable pricing: https://jp-postal-lookup-mcp.donniertf.workers.dev/pricing.json · Server card: https://jp-postal-lookup-mcp.donniertf.workers.dev/.well-known/mcp

## Sources
- Zipcloud Japan Postcode API (https://zipcloud.ibsnet.co.jp/)

## Notes
Japanese postal code (〒) lookup via Zipcloud. Official Japan Post derived data.
Contact: dmorrisonwebdesign@gmail.com. More UK data MCPs: https://github.com/donniertf-hub/uk-mcp-fleet