Free beta

Japan disaster risk, for your app or AI.

A REST API and a public MCP server that return disaster risk for any address in Japan, from official government data — with English responses and source attribution.

REST API

Pass an address (or lat/lon) and get a JSON assessment of six hazards. Add &lang=en for English labels. No auth (free beta). CORS enabled.

GET https://mamoie.com/api/v1/hazard?address=<Japanese address>&lang=en
GET https://mamoie.com/api/v1/hazard?lat=35.71&lon=139.81&lang=en

# example
curl "https://mamoie.com/api/v1/hazard?lat=35.71008&lon=139.80861&lang=en"

Example response

{
  "version": "1.0",
  "language": "en",
  "location": { "address": "Tokyo, Sumida, Oshiage 1-1-2", "lat": 35.71008, "lon": 139.80861 },
  "judgement": "High caution",
  "flags": ["Flood-designated area", "High earthquake probability", "Storm-surge inundation assumed", "High liquefaction potential"],
  "hazards": {
    "flood":       { "inZone": true, "depth": "0.5–3.0m", "durationToRecede": "1–3 days" },
    "earthquake":  { "prob30yrPct": { "shindo5strong": 99.7, "shindo6weak": 83.2, "shindo6strong": 31.5 } },
    "landslide":   { "inZone": false, "types": [] },
    "tsunami":     { "inZone": false },
    "highTide":    { "inZone": true },
    "liquefaction":{ "level": "High", "landform": "Drained land (polder)" },
    "elevationM":  2.3
  },
  "sources": ["MLIT / GSI 'Overlay Hazard Map'", "NIED 'J-SHIS' (2024 edition)", "..."],
  "license": "Usable with attribution. ...",
  "disclaimer": "Reference information based on public data; not advice. ..."
}

MCP server (for AI assistants)

Add mamoie to Claude or any MCP-compatible client. Your assistant can then answer "what is the disaster risk of this address?" from official Japanese data. Add the following to your MCP client config:

{
  "mcpServers": {
    "mamoie": {
      "type": "http",
      "url": "https://mamoie.com/api/mcp"
    }
  }
}

Endpoint: https://mamoie.com/api/mcp (Streamable HTTP). Tool: check_home_disaster_risk(address, lang?) — pass lang: "en" for an English summary.

Attribution, license & fair use

Returned values are statistical judgments derived from public open data — not redistribution of raw data (e.g. map tiles).
Please attribute the source (mamoie / GSI / J-SHIS). See data sources.
Reference information only — not a guarantee of safety or purchase/insurance advice. Resolution is ~250m mesh.
Free beta — please use responsibly. For commercial / high-volume use, get in touch below.

Commercial / high-volume use

Need an SLA, higher limits or a dedicated key? A commercial plan is in preparation. Tell us your use case and we'll prioritise you.

mamoie (EN)　|　日本語ドキュメント　|　Data sources　|　Operated by civilrize