# datausa.data.query

Query US government statistical data (Census/ACS, BLS, IPEDS, and more) from Data USA. Group by one or more dimensions (e.g. State, Year, Industry) and retrieve one or more measures (e.g. Population, Median Household Income), optionally restricted to specific member keys. Returns dataset source/citation plus the resulting rows (Data USA, Deloitte/Datawheel/MIT Media Lab, US government open data)

Agent View of the PolicyLayer registry record for `datausa.data.query`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/datausa.data.query

## Facts

- Tool: `datausa.data.query`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 7 (3 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `cube` | string | yes | Data cube (dataset) name to query, e.g. "acs_yg_total_population_1". Look up names via datausa.reference.cubes. |
| `sort` | string | no | Sort order as "field" or "field.order" where order is asc/desc, e.g. "Population.desc". |
| `limit` | integer | no | Maximum number of result rows to return (default 100, max 1000). |
| `offset` | integer | no | Number of result rows to skip, for pagination (default 0). |
| `include` | string | no | Restrict results to specific member keys, formatted "Level:key,key;Level2:key" (e.g. "State:04000US06" for California only, or "Year:2021,2022"). Find member ke |
| `measures` | array | yes | Measure (metric) names to retrieve, e.g. ["Population"]. Look up available measures for a cube via datausa.reference.cubes. |
| `drilldowns` | array | yes | Dimension level names to group the results by, e.g. ["State"] or ["State", "Year"]. Look up available levels for a cube via datausa.reference.cubes. |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "datausa.data.query",
    "arguments": {
      "cube": "<cube>",
      "measures": [],
      "drilldowns": []
    }
  }
}
```

## Why datausa.data.query is rated Low

Tool retrieves public statistical data with no modification, deletion, or execution capabilities; read-only query operation.

From the tool's own definition: "Query US government statistical data, retrieve rows, returns dataset source/citation"

## Use case

AI agents call datausa.data.query to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "datausa.data.query": {}
  }
}
```

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- Check every server in your MCP config at once: `npx -y policylayer stack`
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---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase