Zipcodestack API
Maps & Location · Operational · 30d uptime 100%
Zip Code API - Free Postal Code Validation
Trust signals
Pricing
FREEMIUM
Auth
API_KEY
CORS
No
Rate limit
100 requests/month free
Health
151ms
Trust score
87 (B)
Last checked Oct 19, 2026 · uptime 24h 100% / 7d 100% / 30d 100%
Strong candidate; weakest signal is CORS.
Links
- Homepagezipcodestack.com
- Documentationzipcodestack.com
- Base URLzipcodestack.com/
Integration checklist
- Auth is API_KEY
- No CORS — route calls through your backend.
- Rate limit: 100 requests/month free