1Lookup

1Lookup is a real-time data verification API that lets teams check phone numbers, emails, IP addresses, and domains the moment a user submits them, so bad signups get caught at the door and dirty data never makes it into your database. It's built and run by Momentum Labs, founded by Nadav Boaz, and operates out of Pinedale, Wyoming. The core idea is consolidation, instead of buying a phone validator from one vendor, an email checker from another, and an IP intelligence service from a third, you run all of it through a single API with one credit system. The company positions itself as a faster, cheaper, simpler alternative to the legacy verification vendors that dominate this space. The product breaks into a few main verification services. Phone validation checks whether a number is active, risky, or fraudulent, with a separate spam check that draws on a reported 50 million-plus report sources and claims to cut spam exposure significantly. Email validation verifies addresses in real time and screens against a watchlist of over ten thousand disposable domains, the throwaway addresses that fraudsters and trial-abusers love. IP intelligence flags risky addresses, detects VPNs and proxies against a tracked list of thousands of VPN services, and resolves geolocation so you can spot traffic that doesn't match a claimed location. Domain intelligence is listed as coming soon. On performance, the vendor claims sub-300-millisecond average responses, processing of over ten million lookups a day, fifteen-plus global data centers, and accuracy figures in the high nineties, though as with any vendor-stated number you'll want to validate those against your own traffic before trusting them in production. Beyond the core four, 1Lookup has expanded into adjacent data services. There's FCRA-compliant skip tracing run against a very large records set, reported in the tens of billions of records, for locating people and assets, which is a meaningfully different and more compliance-sensitive product than simple contact validation. There's also a bulk audio transcription API pitched at lower cost than the big providers, with multi-language auto-detection and sub-two-second latency. And the whole thing runs on a universal credit system, one credit type spends across every product, so you're not stuck managing separate plans and balances per feature. Getting started is freemium and deliberately low-friction. You sign up, get a batch of free credits, the company advertises a thousand free lookups to test with, and you're running inside about five minutes. From there it's pay-as-you-go, billing starts from around ninety-nine dollars a month with no contracts, no setup fees, no monthly minimums, and cancel-anytime terms, with volume discounts available for enterprise. The company also name-drops integration with stacks like Twilio, Salesforce, HubSpot, Okta, and Microsoft Dynamics, signaling it wants to slot into existing fraud and growth workflows rather than be a standalone island. The strengths are clear. One credit type across every product is genuinely convenient and easier to reason about than juggling separate per-feature plans. The free credits plus a fast setup mean you can actually test it against your own data before committing a cent. And pay-as-you-go with no contracts suits teams that don't want to lock into an annual deal for something they're still evaluating. The weaknesses deserve equal weight. The accuracy and speed figures are all vendor-stated and not independently verified, so production teams absolutely should benchmark against their real traffic rather than taking the marketing numbers at face value. The skip-tracing and people-data side raises genuine compliance considerations, FCRA-covered data has rules about permissible use, and that's on you to get right. Pay-as-you-go can become expensive at high lookup volume, where a flat enterprise contract from a competitor might pencil out cheaper. And the depth of documentation and support for large, mission-critical rollouts is harder to gauge from the outside than it is with the entrenched incumbents. Who it fits: developers and growth or fraud teams that need to validate contact data at signup, block fake or fraudulent accounts, scrub and enrich marketing lists, or screen out VPN and proxy traffic. Who should be cautious: teams with very high volume who should price-compare against contract-based competitors, and anyone using the skip-tracing side without a clear compliance plan. Against established names like Twilio Lookup, ZeroBounce, and IPQualityScore, 1Lookup's pitch is breadth under one credit and a cheaper, simpler entry point.