Looking for an OpenCorporates Alternative? Compare OpenSOSData's Pi-Priced Secretary of State API

OpenCorporates Alternative: Why Developers Are Switching to OpenSOSData

If you're building compliance, due diligence, or business intelligence tools, you've likely evaluated OpenCorporates. It's the industry standard. But it's also expensive at $0.10 to $0.50 per lookup, with subscription minimums and rate-limiting friction.

OpenSOSData takes a different approach: a REST API for US Secretary of State entity lookups priced at $0.0314 per lookup (Pi pricing—irrational, infinite, fundamental). No subscription required. No minimums beyond a $3.14 wallet deposit. Pay only for what you use.

This post compares OpenSOSData to OpenCorporates and other alternatives, covering pricing, coverage, data returned, and caching behavior.

Head-to-Head Comparison: OpenSOSData vs. OpenCorporates

Coverage: When OpenSOSData Works Best

OpenSOSData currently supports 11 actively-maintained states: Delaware, Arkansas, Texas, Colorado, Georgia, Minnesota, North Dakota, Idaho, Alabama, North Carolina, and Florida.

If your use case is limited to these states, OpenSOSData is a direct, cheaper alternative to OpenCorporates. If you need all 50 states or international coverage, OpenCorporates remains necessary—but consider using OpenSOSData for your supported states and OpenCorporates for the rest to optimize costs.

What Data Does OpenSOSData Return?

Each lookup returns:

• Entity name
• Entity type (LLC, Corporation, etc.)
• Unique entity ID
• Current status (active, dissolved, etc.)
• Formation date
• Registered agent name and address
• Principal business address
• Officers and their details

This matches the core fields developers need for compliance, KYC, and business intelligence workflows. If you require more exotic fields (historical amendments, lien records, etc.), you may need OpenCorporates or specialized databases.

Pricing Deep Dive: Where OpenSOSData Wins

At $0.0314 per lookup, OpenSOSData is 3x to 16x cheaper than competitors:

• OpenCorporates: $0.10–$0.50 per lookup (3–16x more expensive)
• Cobalt Intelligence: $0.50–$2.00 per lookup (16–64x more expensive)
• Middesk: $1.00+ per lookup (32x+ more expensive)

For a small compliance startup running 10,000 lookups/month in supported states, the math is stark:

• OpenSOSData: $314/month
• OpenCorporates: $1,000–$5,000/month
• Cobalt Intelligence: $5,000–$20,000/month

The $3.14 minimum wallet deposit (100 free lookups) is designed to lower friction for developers evaluating the API. No subscription lock-in. No surprise overage charges. Pay-as-you-go.

Free Cache Hits: The Hidden Savings

OpenSOSData caches all lookups in Redis for 7 days. Cache hits are free. If your application frequently checks the same entities (common in due diligence workflows), your effective cost per lookup drops significantly.

To force a fresh real-time scrape and bypass the cache, use the ?fresh=true query parameter. Otherwise, you benefit from free cache hits automatically.

Quick Start: Your First Lookup

Here's how to make your first API call to OpenSOSData:

curl -X POST https://api.opensosdata.com/v1/lookup \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "state": "DE",
    "entity_name": "Apple Inc",
    "entity_type": "corporation"
  }'

Replace YOUR_API_KEY with your API key from https://opensosdata.com. The response includes all fields listed above.

For repeated lookups of the same entity, subsequent calls within 7 days will hit the cache and return instantly for free.

When to Choose OpenSOSData Over OpenCorporates

Use OpenSOSData If:

• You operate primarily in DE, AR, TX, CO, GA, MN, ND, ID, AL, NC, or FL
• You need cost-effective compliance/KYC lookups at scale
• You're building a bootstrapped or early-stage product
• You have acceptable lookups (same entity checked multiple times) that can benefit from caching
• You want no-subscription, pay-per-use pricing

Stay with OpenCorporates If:

• You need all 50 US states or international coverage
• You require advanced fields beyond basic entity info and officers
• You've already integrated and see ROI from their platform
• Your use case is already optimized for their billing model

Hybrid Approach: Best of Both

Many developers use a hybrid strategy: OpenSOSData for supported states, OpenCorporates for the remaining 39 states and international lookups. This minimizes costs while maintaining comprehensive coverage.

Since both APIs follow REST conventions, switching between them is straightforward from an engineering perspective.

Get Started Today

OpenSOSData is in active beta. Sign up for the waitlist at https://opensosdata.com to join developers already using the platform for cost-effective Secretary of State lookups.

See the full API documentation at https://opensosdata.com/openapi.yaml.

Ready to replace OpenCorporates for your supported states? Start your free trial today.