Enrich phone numbers only for interested leads with no phone

When a reply is labeled Interested and the lead has no phone number, Master Inbox runs phone enrichment on your own provider account. Credits are spent only on leads worth calling.

Enrichment

Prospeo

Findymail

Icypeas

BetterContactSDR managerRevOpsRevenue plan

When

Add LabelInterested

Only if

Phone number is empty

Then

Enrich the prospectPhone only enrichment

Why teams run it

Teams stop paying to enrich every cold contact and still get numbers for every hot one.

Set it up in Master Inbox

In Master Inbox, open Settings, then Workflows, and click Add a workflow.
Name it Enrich phone numbers only for interested leads with no phone.
Set the trigger to Add Label and choose Interested.
Add a condition: Phone number is empty.
Add the action Enrich the prospect: Phone only enrichment.
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. This workflow also uses conditions: add them under trigger_config.conditions, as shown on the conditions page.

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": "Enrich phone numbers only for interested leads with no phone",
  "trigger_type": "add_label",
  "trigger_config": {
    "label_ids": [
      176479
    ]
  },
  "action_configs": [
    {
      "action_type": "enrich_prospect",
      "enrich_with": "enrich_phone"
    }
  ]
}'

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: "Enrich phone numbers only for interested leads with no phone". 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

Why phone only?

When you already have the email, phone-only enrichment is cheaper than a full contact lookup.

What happens when a number is found?

The Found Phone Number trigger fires, so another workflow can label the lead Call or push it to your dialer.

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 Revenue plan. Every plan has unlimited users and starts with a free 7-day POC.