1Lookup

1Lookup, founded in 2022, is a fraud prevention platform specializing in real-time validation of phone numbers, email addresses, and IP data.

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1Lookup provides real-time validation of phone numbers, emails, and IPs to prevent fraud.

1Lookup, founded in 2022, is a fraud prevention platform specializing in real-time validation of phone numbers, email addresses, and IP data. The company has positioned itself as a leader in the fraud detection space, leveraging a global intelligence network that processes over 10 million daily lookups. Headquartered in San Francisco, 1Lookup has attracted a diverse customer base, including enterprises in SaaS, telecommunications, and insurance.

The company claims an enterprise-grade accuracy rate of over 97.8% for phone validation, which has been a key driver of its rapid adoption. In 2025, 1Lookup secured $25 million in Series B funding led by Sequoia Capital, bringing its total funding to $40 million. This investment has been directed toward expanding its global data centers and enhancing its machine learning-powered anomaly detection capabilities.

The company’s API-driven approach has been integrated into platforms like Twilio, Salesforce, and HubSpot, enabling seamless fraud prevention for businesses of all sizes. Despite its growth, 1Lookup faces challenges in maintaining its competitive edge as larger players like Google and Microsoft enter the fraud detection market. Additionally, the company has been scrutinized for its reliance on third-party data sources, which could pose risks to its accuracy and reliability.

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Products by 1Lookup

Who buys this

  • B2B SaaS companies
  • Telecommunications providers
  • Insurance companies
  • E-commerce platforms
  • Financial services firms

Publicly disclosed clients

  • CloudVault
  • SecureShield Insurance
  • VelocityTel Communications

Strengths and what to watch

Strengths

  • Enterprise-grade accuracy rate of over 97.8%
  • Processes over 10 million daily lookups
  • Integrates seamlessly with platforms like Twilio and Salesforce

Watch for

  • Increasing competition from tech giants like Google and Microsoft
  • Reliance on third-party data sources
  • Potential scalability issues with rapid growth

Key Information

Founded
2022
Headquarters
San Francisco

Frequently Asked Questions

What does 1Lookup do?

1Lookup provides real-time validation of phone numbers, emails, and IP addresses to prevent fraud. Founded in 2022, it processes over 10 million daily lookups with 97.8% phone validation accuracy. The platform integrates with major services like Twilio and Salesforce for enterprise fraud prevention.

How accurate is 1Lookup's phone number validation?

1Lookup maintains an enterprise-grade accuracy rate of 97.8% for phone number validation. This high precision comes from their global intelligence network processing millions of daily lookups. The company focuses on continuous improvement through machine learning to maintain this benchmark in fraud detection.

Which companies use 1Lookup for fraud prevention?

1Lookup serves SaaS companies, telecom providers, insurers, and financial firms. Notable clients include CloudVault, SecureShield Insurance, and VelocityTel Communications. Its API integrates with platforms like HubSpot and Salesforce, making it versatile for businesses needing real-time validation across customer touchpoints.

How does 1Lookup compare to Google's fraud detection tools?

1Lookup specializes in phone/email/IP validation with 97.8% accuracy, while larger players like Google offer broader fraud solutions. The company differentiates through API-first design and industry-specific integrations, though faces scaling challenges against tech giants' resources in this competitive space.

What are 1Lookup's main integration options?

1Lookup offers API integrations with Twilio, Salesforce, and HubSpot for seamless fraud prevention. Its developer-friendly approach enables businesses to embed real-time validation into existing workflows. The platform processes over 10 million daily lookups across these integrated systems.

Is 1Lookup reliable for enterprise fraud detection?

1Lookup demonstrates enterprise reliability with 97.8% validation accuracy and 10 million daily processed lookups. However, its reliance on third-party data sources warrants evaluation for specific use cases. The $40 million funding supports ongoing infrastructure and machine learning improvements for sustained performance.

Sources

  1. www.1lookup.io — Company overview and product details
  2. www.sec.gov — SEC filings and financial data
  3. www.sec.gov — EDGAR search for company filings
  4. adviserinfo.sec.gov — Investment Adviser Public Disclosure data