1Lookup
Contact data API
Real-time contact verification and enrichment API for phone, email, and IP.
- 2025
- Launched
- Phone · Email · IP
- Verifies
- Momentum Labs
- Portfolio
1Lookup’s own publicly stated metrics, shown for context.
Why retention matters here
A Small Team, a Lot Riding on It.
1Lookup is an API other products build on: real-time checks on phone numbers, emails, and IP addresses. When something is infrastructure, reliability is the product, and reliability rides on a small engineering team that knows the data sources and the edge cases cold.
A couple of engineers hold most of that context. Lose one without warning and it is not just a hiring problem, it is every product downstream feeling it. Those are also exactly the engineers the market competes hardest for.
How they use TeamPredict
Early Warning, Where It Counts.
Track the engineers behind the uptime
1Lookup watches the small group whose knowledge keeps the API dependable, rather than trying to monitor everyone.
See the outside signals early
When a key engineer's public profile starts showing the changes that tend to precede a move, the team gets a flag with the specific changes behind it, in time to talk.
Keep the infrastructure staffed
An early read means a retention conversation or a knowledge-transfer plan before a resignation, not a downstream outage after one.
The value
When your product is infrastructure, a surprise departure is a reliability risk. Early warning turns it into something the team can plan around: a managed handover instead of a scramble, so the products that depend on 1Lookup never feel it.
1Lookup is infrastructure other products in our portfolio depend on, built by a small engineering team. When your uptime rides on a few people, you want early warning if one of them starts looking, not a scramble the day they give notice.
Do What 1Lookup Does.
Track the people you can least afford to lose, and get an early read before they start looking.
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