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1Lookup is the world's most accurate data verification platform, helping small and medium businesses verify phone numbers, emails, and IP addresses with a 99.97% accuracy guarantee. Unlike competitors who use outdated data, we update our database daily from primary sources like FCC feeds and carrier APIs, making us 15% more accurate and helping catch 25% more invalid numbers. Our unified platform provides comprehensive validation services including intelligent fraud scoring, carrier detection, spam identification, and deliverability checks with sub-300ms response times worldwide. We serve thousands of businesses across financial services, e-commerce, healthcare, marketing, and real estate industries who trust us for transparent pricing with no hidden fees or contracts, instant setup in under 5 minutes, and real human support that understands small business needs. Whether you need to verify a single contact or process thousands of records, 1Lookup delivers the reliability and accuracy your business demands with customers typically seeing 85% reduction in fraud, 98%+ delivery rates, and significant improvements in data quality. Built specifically for SMBs who need professional-grade validation without enterprise complexity or costs, our developer-friendly API integrates seamlessly with your existing systems requiring no technical expertise while offering pay-as-you-use pricing with no minimums required. Experience the difference that fresh, accurate data makes for your business
United States
1Lookup has been a good addition to our workflow over the last few months.
We use it to verify IPs, emails, and phone numbers, which has noticeably cut down the time we spend chasing dead-end applications.
It’s reasonably priced and their support team is actually helpful. It's a very practical tool for what we need.
We run a SaaS product with free trials and were getting flooded with bots and fake users.
After integrating 1Lookup, the difference was night and day.
It quietly filters out junk signups without blocking legitimate customers. The support team even helped us fine-tune our risk thresholds on a quick Zoom call.
Being honest - we couldn’t ask for more.
We use 1Lookup inside our telemarketing app to verify numbers before they go to the dialer. Setup was simple and the results have been consistent. It’s not overloaded with features — just fast, accurate, and reliable.
Docs could be a bit deeper, but honestly, it works out of the box.
I’ve seen hundreds of “validation” APIs come and go. 1Lookup stands out because they don’t oversell. Their data is solid, support is honest, and they’re transparent about limitations - that’s rare in this industry.
I’ve replaced three tools with this one. They listen, they iterate, and they keep improving. You can feel there are actual engineers behind it, not just salespeople.
I’m a backend dev running a small telemarketing SaaS. 1Lookup has been very reliable so far. Caught a lot of bad or inactive numbers before agents wasted calls. Would love to see more meta data returned (like carrier name or last active date), but overall, no complaints.
Been using 1Lookup for a couple months now. We verify leads before pushing them into PipeDrive. Honestly it just works. Not fancy, not buggy, and the support actually answers when you write them. Can’t really ask for more.
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