Reply to positive leads with a personalized video made in Clay

When a reply is labeled Interested, a webhook sends the lead to Clay, which builds a personalized video and posts a draft back to the same thread through the Master Inbox API for a rep to approve.

AI agents

ClayFounderSDR managerTeam plan

When

Add LabelInterested

Then

Send a webhookSend the prospect id, email, company and thread URL to your Clay table

Why teams run it

High-touch replies at scale, sent from the same mailbox and thread.

Set it up in Master Inbox

In Master Inbox, open Settings, then Workflows, and click Add a workflow.
Name it Reply to positive leads with a personalized video made in Clay.
Set the trigger to Add Label and choose Interested.
Add the action Send a webhook: Send the prospect id, email, company and thread URL to your Clay table.
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": "Reply to positive leads with a personalized video made in Clay",
  "trigger_type": "add_label",
  "trigger_config": {
    "label_ids": [
      176479
    ]
  },
  "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: "Reply to positive leads with a personalized video made in Clay". 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

Which endpoint saves the draft?

POST /draft-message saves a draft on the thread, and POST /send-draft sends it.

Will the AI agent reply as well?

Keep the agent off the label you use for Clay, or in human-in-the-loop mode, to avoid two replies.

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.