Sync Smartlead replies to HubSpot without Zapier

When a Smartlead reply is categorized Interested or Meeting request, Master Inbox upserts the HubSpot contact and company and logs the thread. No Zap, no task limits and no broken field mappings.

CRM sync

Smartlead

HubSpotRevOpsRevenue plan

When

Add LabelInterested or Meeting request, synced from the Smartlead category

Then

Sync to HubSpotUpsert the contact and company and attach the conversation

Why teams run it

Retires the Smartlead to Zapier to HubSpot chain that breaks whenever a field or category changes.

Set it up in Master Inbox

In Master Inbox, open Settings, then Workflows, and click Add a workflow.
Name it Sync Smartlead replies to HubSpot without Zapier.
Set the trigger to Add Label and choose Interested or Meeting request, synced from the Smartlead category.
Add the action Sync to HubSpot: Upsert the contact and company and attach the conversation.
Save the workflow and switch it to Active.

Before you start, connect HubSpot under Settings, Integrations.

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": "Sync Smartlead replies to HubSpot without Zapier",
  "trigger_type": "add_label",
  "trigger_config": {
    "label_ids": [
      176479
    ]
  },
  "action_configs": [
    {
      "action_type": "sync_to_hubspot"
    }
  ]
}'

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: "Sync Smartlead replies to HubSpot without Zapier". 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

Do I still need a Zapier plan for this?

No. The HubSpot sync is native, so the zap can be switched off once this workflow is active.

Will HubSpot get contacts that never replied?

No. Only leads that get one of the chosen labels are synced.

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.