Check your contact list for valid WhatsApp numbers automatically

The system checks every number on your list and marks which ones are actually active on WhatsApp.

How the work actually flows

It repeats. Repeats moves to next batch; runs once per each number in batch.

Pattern: Structured Loop (21) ยท Multiple Instances with a priori Design-Time Knowledge (13)

flowchart TD trig(["scheduled number verification check"]):::trigtime s0["find unverified numbers"]:::task s1[["process next batch"]]:::mi s2["check number on whatsapp"]:::svc s3[("write result to spreadsheet")]:::store trig --> s0 s0 -->|"one per each number in batch"| s1 s1 --> s2 s2 --> s3 lp{"until all numbers checked"}:::gate s3 --> lp lp -. "moves to next batch" .-> s0 lp -->|"finished"| out out[/"spreadsheet of verified whatsapp numbers"/]:::out pay{{"clean list without manual checking"}}:::pay out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff
Starts itA stepAn outside serviceRuns once per itemA record or sheetRepeat or finishResultPayoff
Build size
Advanced

A larger build with multiple systems, AI reasoning, and custom rules.

Business functions
CRM & Sales PipelineMessaging & NotificationsSpreadsheet & Database Ops
Connects
Google SheetsWasenderAPIWhatsApp

The problem it solves

You've got a growing contact list, but you don't know which numbers are real, active WhatsApp accounts. Sending messages to dead or wrong numbers wastes time and hurts your response rates. Checking each number by hand is slow and easy to fall behind on.

Who it fits

Sales, marketing, or support teams that message customers over WhatsApp and need a clean, verified contact list.

How it works

  1. On a set schedule, the system checks your spreadsheet for unverified numbers
  2. It works through them in small batches to stay within messaging limits
  3. Each number is checked against WhatsApp to see if it's active
  4. The result is written back next to that contact
What you get

Numbers verified before you send a message

Your contact list gets checked automatically so you know which numbers are active on WhatsApp before you reach out.

What you get

An updated spreadsheet showing which contacts have valid, active WhatsApp numbers.

What you need

A Google account, a WhatsApp number used for verification, and a WasenderAPI subscription.

We can build this. But should you?

The hard question is not how to build it. It is whether this is the right thing to build first.

That is what a Fractional Chief AI Officer figures out with you, before anyone writes a line of code.

Let's Talk Strategy

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