Twilio Lookup API
Phone verification software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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- Transportation and logistics
What is Twilio Lookup API
Twilio Lookup API is a phone number intelligence and verification API used to validate and enrich phone numbers before messaging, voice, or account actions. It is typically used by developers and fraud/risk or growth teams to check number format validity, line type (mobile/landline/VoIP), carrier, and (where supported) caller name and SIM-related signals. The service is delivered as a REST API and is commonly integrated into sign-up flows, contact data hygiene, and messaging deliverability controls. It is part of Twilio’s broader communications platform and is designed to be embedded into applications rather than used as a standalone end-user tool.
Developer-first API integration
The product is delivered as a REST API with SDK support, making it straightforward to embed into web and mobile applications. It fits common engineering patterns for synchronous checks during registration, checkout, or messaging send-time. Twilio’s platform approach also simplifies using Lookup results to route downstream communications workflows. This is useful for teams that prefer programmatic control over a GUI-based verification tool.
Carrier and line-type enrichment
Lookup returns carrier and line-type data (for example, mobile vs. landline vs. VoIP) that can be used to reduce failed sends and improve channel selection. These attributes support policy decisions such as blocking high-risk number types or requiring step-up verification. The enrichment can also help normalize contact records for CRM and customer data pipelines. This goes beyond basic formatting checks by adding telecom context.
Global coverage via telecom network
The API is designed for international phone number use cases and supports E.164 formatting and country-aware parsing. It can help organizations operating across multiple regions standardize number validation logic in a single integration. Global carrier intelligence is particularly relevant for messaging deliverability and compliance workflows. Coverage and available fields vary by country, but the service targets multi-country deployments.
Not a full OTP solution
Lookup provides number intelligence and validation signals but does not, by itself, complete user verification with a one-time passcode. Many phone verification programs require pairing Lookup with separate SMS/voice OTP delivery and verification logic. Organizations expecting an end-to-end verification workflow may need additional Twilio products or custom implementation. This increases integration scope compared with turnkey verification tools.
Data fields vary by region
Availability and accuracy of enrichment fields (such as caller name or certain SIM-related signals) can differ by country and carrier. Teams must test target markets and design fallbacks when specific attributes are unavailable. This can complicate global product rollouts that assume uniform data. It also requires ongoing monitoring as telecom data sources change.
Usage-based cost management
The service is priced per API request, so costs scale with traffic and can be material for high-volume sign-up or contact-cleaning workloads. Controlling spend typically requires caching, rate limiting, and selective checks (for example, only on risk triggers). Budgeting can be less predictable than flat-fee verification packages. Engineering effort may be needed to optimize call patterns.
Plan & Pricing
Pricing model: Pay-as-you-go
Free tier/trial:
- Twilio advertises a free Twilio account to build with all features and no commitments (free trial available). See official pricing page for details.
Example costs (from Twilio Lookup pricing page):
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Formatting & validation — Free.
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Inbound caller identification (US only) — $0.01 per request.
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Identity Match — $0.10 per request (note: "prices vary per country" is stated).
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Reassigned Number Risk (tiered volume pricing):
- 0–1,000 queries — $0.02 per request
- 1,000–10,000 — $0.014 per request
- 10,000–50,000 — $0.0125 per request
- 50,000–200,000 — $0.0085 per request
- 200,000–500,000 — $0.0075 per request
- 500,000–2,000,000 — $0.003 per request
- 2,000,000–6,000,000 — $0.0025 per request
- 6,000,000+ — $0.0015 per request
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Line Type Intelligence — $0.008 per request.
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Line Status (tiered volume pricing):
- 0–100,000 — $0.007000 per request
- 100,001–500,000 — $0.006300 per request
- 500,001–1,000,000 — $0.005600 per request
- 1,000,001–2,500,000 — $0.004900 per request
- 2,500,001–5,000,000 — $0.004550 per request
- 5,000,001–10,000,000 — $0.004200 per request
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10,000,000 — $0.003850 per request
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Phone number risk assessment:
- SMS Pumping Risk Score (ROW) — $0.025 per request
- NAMER — Free (region-specific)
- SIM swap & call forwarding — Contact sales (no public price listed)
Discounts / Notes:
- Pricing is pay-as-you-go with volume tier discounts shown for several features (reassigned-number risk, line status, etc.). Twilio also states "unlock volume discounts as you scale" on its pricing overview.
- Some features are region-limited (e.g., inbound caller ID only in the US) and some prices vary by country (explicitly noted for Identity Match).
- Certain advanced features (SIM swap & call forwarding) require contacting sales.
(Information extracted directly from Twilio's official Lookup API pricing page.)
Seller details
Twilio Inc.
San Francisco, CA, USA
2008
Public
https://www.twilio.com/
https://x.com/twilio
https://www.linkedin.com/company/twilio-inc-/
