Side-by-side trust signals. Pick the right column for your next integration.
| Signal | 18F | AWS ACMPCA API |
|---|---|---|
| Category | Open Data | Open Data |
| Pricing | Free | Paid |
| Auth | No | API Key |
| CORS | Yes | Yes |
| Rate limit | Unknown | Unknown |
| Response time | 178ms | 266ms |
| 30d uptime | 100% | 100% |
| Trust score | 87 (B) | 97 (A) |
| HTTPS | No | Yes |
Signals update continuously via automated health checks and verification runs. Data as of Sep 5, 2026.