Send new phone numbers to a Google Sheet call list

When a phone number is found on a lead, a webhook adds the lead, number, company and thread link to a Google Sheet that an outside calling team works from.

Data out

Google Sheets

ZapierSDR managerRevOpsTeam plan

When

Found Phone NumberFrom a signature, Sales Intelligence or enrichment

Then

Send a webhookSend name, phone, company, label names and thread URL to Zapier or n8n, which adds a Google Sheets row

Why teams run it

Callers who do not use Master Inbox still get every new number the same day.

Set it up in Master Inbox

In Master Inbox, open Settings, then Workflows, and click Add a workflow.
Name it Send new phone numbers to a Google Sheet call list.
Set the trigger to Found Phone Number and choose From a signature, Sales Intelligence or enrichment.
Add the action Send a webhook: Send name, phone, company, label names and thread URL to Zapier or n8n, which adds a Google Sheets row.
Save the workflow and switch it to Active.

Or create it with the API

Everything in the workflow builder is also in the Master Inbox API. This request creates the same workflow. Replace the example ids with your own label, list and campaign ids from GET /workflows/filter-fields.

curl -X POST https://api.masterinbox.com/api/api-webhook/v1/api/workflows/create-workflow \
  -H "Authorization: Bearer $MASTER_INBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "name": "Send new phone numbers to a Google Sheet call list",
  "trigger_type": "found_phone_number",
  "trigger_config": {},
  "action_configs": [
    {
      "action_type": "webhook",
      "webhook_url": "https://hooks.example.com/master-inbox",
      "webhook_payload_variables": [
        "name",
        "email",
        "company_name",
        "label_names",
        "thread_url",
        "text"
      ]
    }
  ]
}'

Full reference: workflow API guide and API docs.

Or ask Claude, ChatGPT or Grok to build it

Our workflow guide is written for AI agents to read. Give your assistant your API key and this prompt:

Read https://app.masterinbox.com/public-workflow-api.md and use my Master Inbox API key to create this workflow: "Send new phone numbers to a Google Sheet call list". First call GET /workflows/filter-fields and look up my label, list and channel ids, then create the workflow and tell me what you set up.

Questions

Can I limit it to positive leads?

The phone trigger takes no conditions, so filter by label in Zapier or n8n.

Where do the numbers come from?

Email signatures read by Sales Intelligence, your sequencer data or enrichment.

Can I build this workflow through the API?

Yes. Send the create-workflow request shown on this page with your Master Inbox API key. The API checks the payload first and lists every problem by field if anything is off.

Which plan includes this?

This workflow works on the Team plan. Every plan has unlimited users and starts with a free 7-day POC.