# OpenSOSData – US Business Entity Search

Looks up US company registrations in official state registries from inside your agent chat. Handy when you need to confirm an LLC or corporation is active before a deal.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 6
- Author: OpenSOSData
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/OpenSOSData/opensosdata-mcp
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/mcp/opensosdata-us-business-entity-search

## What it does

The server hands your agent five tools. `search_business_entity` takes a name and a state and returns the entity ID, status, type, registered agent and address. `check_entity_status` tells you whether a business is active, inactive or dissolved. `batch_search` handles up to 10 entities at once across different states. Two more tools describe coverage: `list_supported_jurisdictions` and `get_jurisdictions_for_region`, the latter grouped by region such as northeast or southeast.

Records come from Secretary of State portals at query time rather than a stale database. Coverage spans the 50 states plus Washington DC, Puerto Rico and US Virgin Islands. Every tool is read-only.

An `OPENSOSDATA_API_KEY` is required — the server will not run without one. Keys come from opensosdata.com, and signup includes 10 free lookups with no credit card. After that it is pay-as-you-go at $0.0314 per lookup, no subscription. There is also a remote option that skips installation entirely: `https://mcp.opensosdata.com/mcp`, with the key sent as a Bearer token in the Authorization header.

## Requirements
- Remote server: `https://mcp.opensosdata.com/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http mcp-server https://mcp.opensosdata.com/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add opensosdata-us-business-entity-search --url https://mcp.opensosdata.com/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "opensosdata-us-business-entity-search": {
            "url": "https://mcp.opensosdata.com/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "opensosdata-us-business-entity-search": {
            "type": "http",
            "url": "https://mcp.opensosdata.com/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http opensosdata-us-business-entity-search https://mcp.opensosdata.com/mcp
```

## When to use it
- confirm a vendor is registered in the right state
- check whether a company is still active before signing
- screen a list of vendors in one pass
- work out which registries to check for a multi-state business
- find out whether Puerto Rico is covered

## Example prompts
- Is Stripe Inc registered as a corporation in Delaware?
- Which jurisdictions should I check for a company operating across the Southeast?

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