1Lookup
The #1 tool for validating phone, email and IP data in real time. All through one powerful API.
On 1Lookup
1Lookup is a real-time data verification platform that validates phone numbers, emails and IP addresses with accuracy sourced daily from FCC and carrier data. It unifies validation, fraud scoring and data enrichment into a single API with universal credits, returning results in under 300ms. The service targets SMBs and teams that need to scrub bad data before it hits CRM, dialers or sign-up flows, with built-in fraud scoring and DNC checks. Use cases include lead quality, KYC, call-center dialing, SaaS onboarding and fraud prevention.
1Lookup is the pragmatic choice for SMBs tired of paying for stale, recycled data. It’s fast, simple and honest about pricing—no tiers, no surprise fees. The FCC-grade phone data and real-time fraud scoring stand out, and the universal-credit model keeps integration clean. If you need a single API to validate phones, emails and IPs without building a patchwork of providers, this is it.
Key features
- Phone Intelligence: line type, carrier, DNC registry, fraud score 0–100, sub-300ms
- Email Validation: syntax, MX, SMTP, disposable detection, sub-300ms
- IP Intelligence: VPN/proxy/Tor detection, geolocation, risk scoring, sub-300ms
- Phone Spam Check: 0–100 spam score, robocaller detection, real-time alerts
- Domain Intelligence: tech stack, security signals, business intelligence
- Skip Trace: people search, contact discovery, asset location (FCRA compliant)
- Universal credits: one credit covers any product and any volume tier
- 7-day result caching and 1,000 requests/minute included
Pros and cons
- Direct FCC and carrier-grade data updated daily
- Single API and universal credit system for phone, email and IP validation
- Sub-300ms response times with real-time fraud scoring
- No minimums, no setup fees, pay only for what you use
- Simple 5-minute setup and no long-term contracts
- US-centric phone validation limits global coverage for some use cases
- Documentation is functional but lacks deep examples for advanced use cases
- Fraud scoring thresholds are configurable but require manual tuning for optimal results
Pricing
- Access to all products
- 100 universal credits
- 7-day trial
- No contracts
- Support via email
- All products via API
- 1,000 requests/minute included
- 7-day result caching
- Real-time fraud scoring
- Direct FCC & carrier data updates
- All products
- Higher rate limits
- 99.9% uptime SLA
- Priority support
- Dedicated IP allowlist
- All products
- High-volume burst capacity
- Private API endpoints
- On-prem deployment
- Dedicated success manager
Best for
Integrations & platforms
Twilio · HubSpot · Salesforce · Shopify · Pipedrive · Zapier · Make (Integromat) · Airtable · Stripe · Segment
Frequently asked questions
What is 1Lookup and how does it work?
1Lookup is a data intelligence platform that verifies phone numbers, emails and IP addresses in real time via a single API. It aggregates daily-updated data from FCC and carrier sources, plus proprietary fraud signals, to return confidence and risk scores with every lookup.
How accurate is your data?
Data is updated daily from carrier networks and regulatory databases. Each response includes a confidence score and freshness indicator. Phone validation uses direct FCC and carrier line-type data; email validation performs real-time SMTP checks; IP intelligence detects VPNs, proxies and Tor nodes.
Do you offer a free trial?
Yes. The free trial includes 100 universal credits to test all products. Sign up instantly and start validating within minutes. Additional credits can be purchased as needed.
What are the API rate limits?
Free trial accounts have generous limits for testing. Production plans include 1,000 requests per minute with higher limits available. Enterprise plans offer custom rate limits and dedicated infrastructure.
Is 1Lookup GDPR and industry standards compliant?
Yes. 1Lookup complies with GDPR and other industry standards. All data handling is designed to meet regulatory requirements for privacy and security.
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