The Complete Guide to Business Entity Verification in 2026

Published 2026-04-11 by OpenSOSData

Business entity verification is the process of confirming that a company is a real, legally registered entity in good standing. It is a foundational step in Know Your Business (KYB) compliance, vendor due diligence, and fraud prevention.

Why It Matters

Regulators, payment processors, and financial institutions require verification that the businesses they work with are legitimate. Anti-money laundering (AML) regulations and FinCEN requirements demand that companies verify their business counterparties.

Beyond compliance, entity verification protects against fraud. Shell companies, dissolved entities, and impersonation of real businesses are common vectors for financial crime.

Key Data Points

• Entity Status: Active, Inactive, Dissolved, or Revoked
• Entity Type: LLC, Corporation, LP
• Registered Agent: Name and address (public record)
• Formation Date: When the entity was formed
• State Entity ID: Official filing number
• Principal Address: Business mailing address

The Manual Problem

Each U.S. state maintains its own Secretary of State database. Searching manually means visiting 50 different websites with 50 different interfaces. For compliance teams processing hundreds of verifications per month, this is unsustainable.

How APIs Solve This

A business entity search API provides a single endpoint that queries state databases and returns standardized JSON. OpenSOSData covers 30 U.S. states today at $0.10 standard / $0.0314 Pi per lookup with no subscription.

curl -X POST https://api.opensosdata.com/v1/lookup \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"entity_name": "Example Corp", "state": "DE"}'

For a technical walkthrough, see our Python integration guide. For pricing comparisons, see OpenSOSData vs OpenCorporates.