OpenSOSData – US Business Entity Search
io.github.OpenSOSDataPublished by GitHub account OpenSOSDatav1.0.1Updated Oct 30, 2026
Search US business entity records across all 53 jurisdictions in real time
Overview
Searches US business entity registrations across 53 jurisdictions in real time, letting an assistant look up LLCs and corporations and check their status.
- What you can do
- Search business entities by name and state, returning name, ID, status, type, registered agent and address
- Check whether an entity is active, inactive or dissolved, oriented toward KYB and due diligence
- Run batch searches of up to 10 entities across different states at once
- List all 53 supported jurisdictions, or get the jurisdictions for a US region such as northeast or southwest
- When to use it
- Useful for compliance, KYB, due diligence, legal or lending work where you need to confirm that a company is registered and in good standing in a given US state, or to check several vendors across states in one pass.
- Requirements
- A remote MCP endpoint, or the npm package run through npx for Claude Desktop or Claude Code. An OpenSOSData account and API key are required: passed as the OPENSOSDATA_API_KEY environment variable locally, or as a Bearer token in the Authorization header for the remote server. OAuth authentication is declared.
Installation
In SourceWeft
- Open OpenSOSData – US Business Entity Search in the dashboard and add it to a workspace.
- Connect the required credentials. They are stored privately and never shown on public pages.
- Enable the server for the chats that should use its tools.
Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.
Use with an agent
Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.
Read https://sourceweft.com/mcp/io.github.OpenSOSData%2Fmcp-server/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.Other MCP clients
Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.
{
"mcpServers": {
"opensosdata-us-business-entity-search": {
"type": "http",
"url": "https://mcp.opensosdata.com/mcp"
}
}
}README
OpenSOSData MCP Server
Real-time US business entity search for Claude. Search, verify, and check the status of any LLC, corporation, or registered entity across all 53 US jurisdictions directly from your Claude conversation.
The only business entity search MCP with complete US coverage: all 50 states + Washington DC + Puerto Rico + US Virgin Islands.
What You Can Do
Ask Claude things like:
- "Is Stripe Inc registered as a corporation in Delaware?"
- "Search for any LLC named Apex Consulting in Texas, Florida, and New York"
- "Verify these 5 vendors are properly registered" (batch check)
- "What states does OpenSOSData cover?"
- "Check if this company is active or dissolved in California"
Connect via Claude.ai
- Go to claude.ai/connectors
- Find OpenSOSData
- Connect with your API key from opensosdata.com
Install via Claude Desktop or Claude Code
Add to your claude_desktop_config.json:
Get your API key at opensosdata.com. 10 free lookups included on signup. No credit card required.
Remote MCP Server (No Installation)
Connect directly without installing anything:
Pass your OpenSOSData API key as a Bearer token in the Authorization header.
Available Tools
All tools are read-only (readOnlyHint: true). No data is modified.
Usage Examples
Example 1: KYB Verification
You: "Is Stripe Inc registered as a corporation in Delaware?"
Claude: Calls check_entity_status with entity_name="Stripe" and
state="DE", returns confirmation that Stripe is active and registered,
with entity ID and filing details.
Example 2: Multi-State Due Diligence
You: "Search for any LLC named Apex Consulting in Texas, Florida, and New York"
Claude: Calls batch_search with three entries, returns all
matching entities across all three states with their current status.
Example 3: Vendor Verification
You: "Verify these vendors are properly registered:
- Acme Corp in California
- Summit LLC in Georgia
- Pinnacle Inc in Illinois"
Claude: Calls batch_search, returns active/inactive status
for each vendor with entity IDs for your records.
Example 4: Regional Compliance Check
You: "What jurisdictions should I check for a company doing business across the Southeast?"
Claude: Calls get_jurisdictions_for_region with region="southeast",
returns all Southeast states so you know exactly which registries to verify.
Example 5: Territory Coverage
You: "Does this API cover Puerto Rico and DC?"
Claude: Calls list_supported_jurisdictions, confirms coverage
of all 53 jurisdictions including DC, Puerto Rico, and US Virgin Islands.
Coverage
53 US jurisdictions with live, real-time data:
- All 50 US states including Kansas
- Washington DC (corponline.dlcp.dc.gov)
- Puerto Rico (rcp.estado.pr.gov)
- US Virgin Islands (corporationsandtrademarks.vi.gov)
Data is fetched live from official Secretary of State portals at query time. Not a stale database.
Pricing
No subscription. No monthly fee. Pay only for what you use.
Create your account to get started.
Who Uses This
- KYB/Compliance teams verifying business registrations
- Due diligence workflows checking entity status before deals
- Legal professionals confirming entity standing
- Fintech and lending platforms validating business customers
- Developers building business verification into their products
Documentation
Full documentation and API reference: opensosdata.com/mcp
Support
- Email: [email protected]
- Docs: opensosdata.com/mcp
- Issues: github.com/OpenSOSData/opensosdata-mcp/issues
Privacy
Your search queries are used only to fulfill your request. No conversation data is stored beyond what is necessary to return results.
Full privacy policy: opensosdata.com/privacy
License
MIT
OpenSOSData is not affiliated with any US government agency. Data is sourced from official public Secretary of State portals.
Source: README.md at commit 4897eec
Tools
0Version history
1- v1.0.1LatestOct 22, 2026
Score
75% of the applicable checks met
How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.
- Reached in the last 30 daysRequired25 pts
- Auth declaredRequired10 pts
- Tools listed15 pts
Answer tools/list without a credential, or ship a package that starts in a sandbox without one.
- DescriptionRequired15 pts
- Logo10 pts
- Documentation15 pts
- License10 pts
Declare a license in the repository or the registry entry.