OpenLookup

MCP server from Compound Labs. Eleven read-only lookup tools backed by live public data — no API key, no signup, nothing to sign up for.

mcp-name: tech.thecompound/openlookup

OpenLookup was published on npm as compound-mcp until 2026-10-02. That package is deprecated and points here. Install openlookup instead.

Most OpenLookup tools answer questions that a model cannot answer correctly from its training cutoff. The underlying facts change after training, including current model costs, library maintenance, and whether someone has published a skill you plan to write.

Tools

Facts that change over time

Directories

Compliance

lookup_ada_report(domain)

OpenLookup looks up a US local-government domain in the [CivicBinder Municipal Web Accessibility Index](https://civicbinder.org/ada). The index uses axe-core scans of local-government .gov websites and grades them A–F against WCAG 2.1 AA. The index applies the April 26, 2027 ADA Title II deadline to communities of 50,000+ and the April 26, 2028 deadline to smaller communities and special districts.

The tool returns the grade, violation counts (total / serious / critical), the top failing rules, the entity's deadline, and the public report page (https://civicbinder.org/ada/<domain>). The full index is also published as an open dataset at [civicbinder.org/ada/dataset.json](https://civicbinder.org/ada/dataset.json).

lookup_nonprofit_status(ein)

Checks a nonprofit's EIN against the IRS auto-revocation list and the California Registry of Charities delinquency/suspension lists, via GoodStanding. Returns revocation and reinstatement dates, whether the streamlined 15-month reinstatement window is still open, and whether AB 488 requires charitable fundraising platforms to block the organization's donation pages. A clear: true result means the EIN is on none of the tracked lists.

Related MCP server: propublica-npo-mcp

Install

npm install -g openlookup

Or run without installing: npx -y openlookup

Run

openlookup                # stdio (for MCP clients)
openlookup --http 8974    # streamable HTTP on http://localhost:8974/mcp

Claude Code

claude mcp add openlookup -- npx -y openlookup

Claude Desktop

Add the server to claude_desktop_config.json in Settings → Developer → Edit Config:

{
  "mcpServers": {
    "openlookup": {
      "command": "npx",
      "args": ["-y", "openlookup"]
    }
  }
}

Examples

Which model should I use for a coding agent on a budget?

compare_ai_models({ board: "budget/value", limit: 3 }) →

{
  "board": "budget/value",
  "captured_on": "2026-08-05",
  "models": [
    {
      "rank": 1,
      "model": "z-ai/glm-5.2",
      "blended_usd_per_mtok": 1.175,
      "price_band": "$1 to $5 / M",
      "rationale": "3.05T tokens through 6 tracked coding tools · ranked on usage, which measures adoption rather than capability."
    }
  ]
}

Is the city website at 36thdistrictcourtmi.gov ADA compliant?

lookup_ada_report("36thdistrictcourtmi.gov") →

{
  "found": true,
  "domain": "36thdistrictcourtmi.gov",
  "entity_name": "36th District Court",
  "grade": "A",
  "violations_total": 0,
  "ada_title_ii_deadline": "2027-04-26",
  "report_url": "https://civicbinder.org/ada/36thdistrictcourtmi.gov"
}

Health

The health check records three facts separately. A single health endpoint that ANDs them together cannot identify which fact failed.

npm run health          # the working tree, over stdio
npm run health:public   # npx -y openlookup@latest, resolved fresh from npm

--target public is the deployment check, and it is deliberately outside CI. openlookup has no deployed HTTP endpoint, so the public path is npm: it spawns the published tarball through npx, with a throwaway cache and from a neutral directory, so what answers is what a stranger gets rather than this checkout. Build success and externally reachable protocol state are different facts, and this repo has already shipped a version where they disagreed.

Every signal starts failed. The health check flips a signal only when that run provides evidence for it. A timeout, a dead socket, and a signal that could not be attempted all remain failures with a reason. None of them becomes a pass. A finding exits 0 so a scheduled run cannot disarm itself during an outage. --strict exits non zero, and ops/npm/publish.mjs runs it after publishing.

Each run writes a dated receipt to ops/health/receipts/. The test at ops/health/probe.test.mjs breaks each signal separately and verifies that the health check keeps them separate.

Scheduled every 6 hours as compound.compound-mcp.health.

Compliance tool receipts

lookup_ada_report and lookup_nonprofit_status return the verdict and the lookup in separate fields. clear and grade contain the outcome. checked contains the receipt. The receipt records when the lookup ran, which lists or index it consulted, and what that coverage does not include. An agent can use the receipt to explain what it verified without running the lookup again.

{
  "ein": "475262842",
  "clear": true,
  "checked": {
    "at": "2026-09-20T14:36:34.257Z",
    "sources": [
      "IRS Automatic Revocation of Exemption List",
      "California Attorney General Registry of Charities and Fundraisers"
    ],
    "via": "https://goodstanding.thecompound.tech/api/lookup",
    "scope": "Covers only the two lists named above, as GoodStanding retains them. A clear result means the EIN is absent from those lists. It is not a statement that the organization was never revoked, and no other state registry is consulted."
  }
}

License

MIT © Compound Labs