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FILTER vs. manual calling
Your reps are good at selling. Let them stop being your data-quality check.
Manual calling as a way to validate a lead list works, technically — a rep dials, and eventually learns whether the number was real. The problem is what it costs to learn that: a rep's time, at a rep's fully-loaded cost, spent on an outcome an API call answers in under two seconds.
| FILTER | manual calling | |
|---|---|---|
| Cost to check one number | A fraction of a rupee | Several minutes of a paid rep's time |
| Time to a verdict | Under 1.5 seconds, typically | Minutes to hours, depending on queue |
| Scales to 10,000 numbers overnight | Yes — bulk endpoint, no headcount change | No — requires proportional headcount |
| Builds rapport or gathers qualitative signal | No — it returns a verdict, nothing else | Yes — a human conversation carries information a check can't |
A real conversation still tells you things no API ever will — interest level, objections, tone. FILTER isn't trying to replace that conversation; it's trying to make sure your reps only have it with people who can actually pick up the phone.