OpenSOSData – US Business Entity Search — Claude Code MCP server
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.
claude mcp add --transport http mcp-server https://mcp.opensosdata.com/mcpWhat OpenSOSData – US Business Entity Search 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.
What it helps with
- 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 for the agent
- Is Stripe Inc registered as a corporation in Delaware?
- Which jurisdictions should I check for a company operating across the Southeast?
How to install OpenSOSData – US Business Entity Search
Platform CLI: remote server
claude mcp add --transport http mcp-server https://mcp.opensosdata.com/mcpPlatform CLI: remote server
codex mcp add opensosdata-us-business-entity-search --url https://mcp.opensosdata.com/mcpConfig file
{
"mcpServers": {
"opensosdata-us-business-entity-search": {
"url": "https://mcp.opensosdata.com/mcp"
}
}
}Config file
{
"servers": {
"opensosdata-us-business-entity-search": {
"type": "http",
"url": "https://mcp.opensosdata.com/mcp"
}
}
}Platform CLI: remote server
gemini mcp add -t http opensosdata-us-business-entity-search https://mcp.opensosdata.com/mcpStep by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about OpenSOSData – US Business Entity Search
How do I install OpenSOSData – US Business Entity Search in Claude Code?
Run claude mcp add --transport http opensosdata-us-business-entity-search https://mcp.opensosdata.com/mcp. The API key goes in the Authorization header as a Bearer token.
What does OpenSOSData – US Business Entity Search do?
It searches and verifies US business entities against official registries, returning name, ID, status, type, registered agent and address. Batch search covers up to 10 entities, and separate tools list supported jurisdictions.
What do I need for it to work, and what does it cost?
An OPENSOSDATA_API_KEY from opensosdata.com. Signup includes 10 free lookups without a credit card, then $0.0314 per lookup with no subscription.
