Automate HubSpot & Mailchimp

Stop paying for mismatched spreadsheets. Sync data between HubSpot and Mailchimp in real-time, so you can manage your operations without the busywork.

Get This Workflow Built

Custom API Integration

Secure Data Transfer

Done-For-You Setup

How the Data Flows

graph LR
    subgraph Source ["HubSpot"]
        T1(["All Forms List"])
    end
    
    subgraph Middleware ["Enterprise Integration Core"]
        W[CRON API
Poller] --> V{Validation
& Auth}
        V -->|Fail| DLQ[Dead Letter
Queue]
        V -->|Pass| Map[Data Mapping
& Transformation]
        Map --> Retry[Rate Limiting
& Retries]
    end
    
    subgraph Target ["Mailchimp"]
        A1(["Add Note to Subscriber"])
    end

    T1 -->|JSON Payload| W
    Retry -->|Authenticated API POST| A1

    style Source fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Target fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Middleware fill:#f8fafc,stroke:#94a3b8,stroke-width:2px
    style T1 fill:#3b82f6,stroke:#fff,stroke-width:2px,color:#fff
    style W fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style V fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Map fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Retry fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style DLQ fill:#ef4444,stroke:#fff,stroke-width:1px,color:#fff
    style A1 fill:#e11d48,stroke:#fff,stroke-width:2px,color:#fff

When Hubspot and Mailchimp operate independently, leads captured in Hubspot may not be synchronized with Mailchimp's subscriber list. For instance, if a sales team logs a new lead in Hubspot, that lead won't automatically appear in Mailchimp for targeted marketing campaigns. This results in the marketing team manually exporting contacts from Hubspot and importing them into Mailchimp, wasting hours each week and increasing the risk of human error in data entry.

Top Ways to Automate HubSpot & Mailchimp

Automated Lead Synchronization: Instantly sync leads between HubSpot and Mailchimp, ensuring your marketing team always has access to the latest contact information for targeted campaigns.
Segmented Campaign Targeting: Automatically segment your audience based on HubSpot interactions, allowing for tailored Mailchimp campaigns that resonate with specific customer needs and behaviors.
Comprehensive Performance Tracking: Integrate reporting tools to track the performance of your campaigns across both platforms, providing insights that drive data-informed decisions and optimize future marketing strategies.

How to Build the HubSpot → Mailchimp Sync

In Hubspot, navigate to the 'Webhooks' settings and create a new webhook. Set the trigger to 'Contact Creation' to listen for the contact.created event.
Configure the webhook to send a POST request to your server endpoint, such as https://yourserver.com/hubspot-to-mailchimp with the payload containing the contact's email, first name, and last name.
On your server, parse the incoming JSON payload to extract the relevant data fields: email, first_name, and last_name.
Use the Mailchimp API to insert the new subscriber by sending a POST request to https://.api.mailchimp.com/3.0/lists//members with the following JSON body: {"email_address": "{email}", "status": "subscribed", "merge_fields": {"FNAME": "{first_name}", "LNAME": "{last_name}"}}.
Ensure your server handles error responses from Mailchimp, such as duplicate email addresses, and logs them for review.

Developer Warnings & API Gotchas

Ensure that the email addresses in Hubspot are properly formatted; invalid email formats will cause Mailchimp to reject the subscriber addition.
Mailchimp requires that the status field is set to 'subscribed'; if this is omitted, the API will throw an error and the contact will not be added.
Be cautious with the data types; Hubspot may send fields as strings, while Mailchimp may expect specific formats, such as boolean values for certain fields.

Supported API Operations

We leverage official, stable endpoints to ensure secure data transfer. No deprecated legacy routes.

When this happens in HubSpot... All Forms List

Do this in Mailchimp Add Note to Subscriber
When this happens in HubSpot... CRM Object Property Recently Updated

Do this in Mailchimp Add Subscriber to Tag
When this happens in HubSpot... CRM Object Recently Created

Do this in Mailchimp Add/Update Subscriber
When this happens in HubSpot... CRM Object Recently Updated

Do this in Mailchimp Add/Update Subscriber
When this happens in HubSpot... Company Recently Created or Updated

Do this in Mailchimp Archive Subscriber

SyncMatrix Experts

Available for Hire

We are an AI-powered automation team. We build custom, reliable API workflows that eliminate manual data entry.

Speak with an Integration Architect

We build custom API workflows that don't hit rate limits.

I can see you're looking at mapping HubSpot to Mailchimp. Tell me about your current setup—what's the specific bottleneck you're trying to automate right now?