Sync Instantly interested leads to HubSpot and tell the AE in Slack
When an Instantly lead is labeled Interested, Master Inbox creates or updates the HubSpot record and posts a Slack card to the AE with the reply and thread link, in one workflow.


Why teams run it
The CRM record and the human heads-up happen together, so the AE never works a lead that is missing from HubSpot.
Set it up in Master Inbox
- In Master Inbox, open Settings, then Workflows, and click Add a workflow.
- Name it Sync Instantly interested leads to HubSpot and tell the AE in Slack.
- Set the trigger to Add Label and choose Interested.
- Add a condition: Source is Instantly.
- Add the action Sync to HubSpot: Upsert the contact and company and attach the thread.
- Add the action Notify in Slack: Post the reply, prospect and thread link to the AE channel.
- Save the workflow and switch it to Active.
Before you start, connect HubSpot, Slack 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. 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": "Sync Instantly interested leads to HubSpot and tell the AE in Slack",
"trigger_type": "add_label",
"trigger_config": {
"label_ids": [
176479
]
},
"action_configs": [
{
"action_type": "sync_to_hubspot"
},
{
"action_type": "slack_notify",
"payload_variables": [
"name",
"company_name",
"label_names",
"text",
"thread_url"
],
"show_draft": true
}
]
}'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 Instantly interested leads to HubSpot and tell the AE in Slack". 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
Does the Instantly interest status sync too?
Yes. With label sync on, Instantly lead statuses come into Master Inbox as labels and can fire this workflow.
Can I drop the source condition?
Yes. Without it, Interested replies from every sequencer sync the same way.
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.
Learn more
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