@pipeworx/estat-japan

e-Stat (Japan) MCP — Japanese government statistics aggregator (~5000 tables across population, economy, labor, trade, prices, agriculture, environment). Free with an app ID.

Part of Pipeworx — an MCP gateway connecting AI agents to 1476+ live data sources.

Tools

search_stats(query, limit?, start_position?, lang?) — find stats tables
get_metadata(stats_data_id, lang?) — dimensions + code lists for a table
get_data(stats_data_id, limit?, start_position?, lang?, filters?) — observations
list_data_catalog(query?, limit?, start_position?, lang?) — browse catalog

Auth

Platform key: gateway env PLATFORM_ESTAT_KEY (an appId issued by e-stat.go.jp)
BYO: ?_apiKey=<appId> after registering at https://www.e-stat.go.jp/api/

Data source

https://api.e-stat.go.jp/rest/3.0/app/json/ — appId as query param.

Default language is Japanese (J); pass lang: "E" for English where available.

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "estat-japan": {
      "url": "https://gateway.pipeworx.io/estat-japan/mcp"
    }
  }
}

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/estat-japan/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — ask_pipeworx, discover_tools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://gateway.pipeworx.io/mcp"
    }
  }
}

Both URLs reach the same gateway and the same 1476+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

Using with ask_pipeworx

Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:

ask_pipeworx({ question: "your question about Estat Japan data" })

The gateway picks the right tool and fills the arguments automatically.

License

MIT

Estat Japan