OpenSOSData vs Middesk
Comparing OpenSOSData and Middesk for U.S. business entity search API.
| Feature | OpenSOSData | Middesk |
|---|---|---|
| Price per lookup | $0.0314 - $0.10 | Custom enterprise |
| Subscription required | No (optional cached plans available) | Enterprise contract |
| States covered | 53 (50 states + DC + PR + USVI) | US |
| API access | REST JSON API | REST API |
| Pay as you go | Yes (free tier available) | Varies |
| Data source | Real-time state SOS databases | Varies |
Key Differences
Middesk offers business identity verification with KYB features beyond basic SOS lookups. Their pricing starts at $1.00+ per lookup and typically requires an enterprise sales conversation. OpenSOSData is self-serve at $0.0314 to $0.10 per live lookup — up to 32x cheaper for live lookups.
Middesk bundles SOS data with additional verification features. If you only need SOS entity lookups, OpenSOSData is dramatically cheaper and requires no sales process.
Why Teams Choose OpenSOSData
- $0.0314 - $0.10 per live lookup, no subscription required
- Real-time data queried directly from state Secretary of State databases
- Self-serve signup with instant API access
- 53 jurisdictions live — all 50 states plus DC, PR, and USVI