Send interested replies to Attio with custom field mapping

When a reply is labeled Interested, a webhook passes the lead, company, reply and thread link to Make or n8n, which creates or updates the Attio person and company with exactly the attributes you map.

CRM sync

Attio

n8nRevOpsRevenue plan

When

Add LabelInterested

Then

Send a webhookSend the lead fields, custom fields and thread URL to Make or n8n, which upserts the Attio records

Why teams run it

Attio workspaces with custom objects get clean records, mapped field by field.

Set it up in Master Inbox

In Master Inbox, open Settings, then Workflows, and click Add a workflow.
Name it Send interested replies to Attio with custom field mapping.
Set the trigger to Add Label and choose Interested.
Add the action Send a webhook: Send the lead fields, custom fields and thread URL to Make or n8n, which upserts the Attio records.
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 interested replies to Attio with custom field mapping",
  "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: "Send interested replies to Attio with custom field mapping". 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

Is there a native Attio sync?

Yes. The Attio integration can create contacts and deals per label and add each message as a note, matching by email and then LinkedIn URL. The webhook is for custom attributes.

Can I include Clay data?

Yes. Custom fields synced from your sequencer travel in the webhook payload.

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.