USAspending.gov is the government's official source for federal spending data — $1.5+ trillion in contract awards across 30 million+ records. Unlike SAM.gov, it actually has an API. But should you build on it directly?
The USAspending API: What Works
Credit where it's due — USAspending's API is free, public, and returns JSON. You can query awards by agency, recipient, NAICS code, and more. For a government API, it's surprisingly functional.
**What it does well:**
- Award-level data (individual contracts and transactions)
- Agency spending aggregations
- Geographic breakdowns
- Free with no authentication required
Where It Falls Short
**1. No Contractor Profiles**
USAspending tracks awards, not entities. You can find that "Booz Allen Hamilton" received $4.2B in contracts, but you can't get their NAICS codes, certifications, small business status, or office address from USAspending. That data lives in SAM.gov (which has no API).
**2. No Contact Data**
Who's the project manager on that $10M DOD contract? USAspending doesn't know. There are no contacts, no decision-makers, no emails.
**3. No AI Enrichment**
What technologies does this contractor use? What's their clearance level? What capabilities do they have? This information exists in award descriptions and capability statements, but USAspending serves raw data — no extraction, no enrichment.
**4. No Teaming Intelligence**
Who subs for whom? Which companies team up on which agencies? USAspending has some subcontract data but no relationship scoring or partnership analysis.
**5. Rate Limits and Performance**
The API is slow. Complex queries can take 10-30 seconds. Rate limits are generous but the latency makes it impractical for real-time product features.
Building In-House: The True Cost
We've talked to dozens of teams who tried building their own federal spending pipeline. The pattern is consistent:
- Month 1-2: Download USAspending bulk files, build an ETL pipeline
- Month 3: Realize you also need SAM.gov data, start a second pipeline
- Month 4-5: Build a normalization layer to link USAspending awards to SAM.gov entities
- Month 6: First query-able dataset, but no contacts, no AI, no teaming data
- Ongoing: Maintain both pipelines as government formats change
Total cost: $100K+ in engineering time before your first product feature.
The Third Option: Commercial Data API
GovData Labs combines USAspending award data with SAM.gov entity data, AI-extracted capabilities, verified contacts, and teaming intelligence — all through one API.
Instead of building two pipelines and a normalization layer, you make one API call:
# Get a contractor's full award history
curl "https://api.govdatalabs.com/api/v2/data/entities/C47BNA8GM833/awards?limit=10" \
-H "X-API-Key: your_key"The response includes agency, value, NAICS, set-aside type, and dates — linked to the entity's SAM.gov profile, contacts, and capabilities.
When to Use What
| Use Case | USAspending API | Build In-House | GovData Labs |
|---|---|---|---|
| One-off research | Good | Overkill | Good |
| Product feature | Too slow | 6+ months | Days |
| Need contacts | No | No (different source) | Yes |
| Need AI enrichment | No | Build it yourself | Yes |
| Budget | Free | $100K+ labor | $99-1,499/mo |
For quick, one-off lookups, USAspending's API is fine. For building a product, a commercial API saves months of engineering.