Numverify
Validates phone numbers worldwide and returns carrier, line type, location, and formatting data via a simple REST API.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HTTPS gated behind paid plans; API key exposed in query params rather than headers
⚡ Reliability
Best When
Validating phone numbers during lead capture or onboarding when you need carrier and line-type data in a single call.
Avoid When
You need real-time lookup freshness or operate in regions with sparse coverage; consider Twilio Lookup instead.
Use Cases
- • Validate phone numbers at signup to reduce junk registrations
- • Identify carrier and line type (mobile vs. landline) before sending SMS
- • Normalize and format international phone numbers for storage
- • Enrich customer records with geographic and carrier metadata
Not For
- • Real-time caller ID or reverse phone lookup
- • High-volume production use on the free tier (100 lookups/month)
- • Guaranteed accuracy in all countries — coverage varies
Interface
Authentication
API key passed as `access_key` query parameter on every request
Pricing
Free tier uses HTTP only; HTTPS requires a paid plan
Agent Metadata
Known Gotchas
- ⚠ Free tier enforces HTTP only — HTTPS requires paid plan, which agents should verify before use
- ⚠ API key in query param risks leaking in logs; agents should sanitize URLs
- ⚠ 100 free lookups/month exhausted quickly in any non-trivial agent workflow
- ⚠ Coverage and accuracy varies significantly by country
Alternatives
Full Evaluation Report
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Package Brief
Quick verdict, integration guide, cost projections, gotchas with workarounds, and alternatives comparison.
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Scores are editorial opinions as of 2026-03-07.