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Automatically add form submitters to your Mailchimp email list.

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Setup Steps

1

Get Your API Key

  1. Log in to Mailchimp
  2. Click your profile → Account & billing
  3. Go to Extras → API keys
  4. Click Create A Key
  5. Copy the API key (ends with -usX where X is your data center)
2

Get Your List ID

  1. Go to Audience → All contacts
  2. Click Settings → Audience name and defaults
  3. Find the Audience ID at the bottom
  4. It looks like: abc123def4
3

Configure in Spike

  1. Go to your Spike Dashboard
  2. Select your form → Settings
  3. Scroll to Integrations → Mailchimp
  4. Enable the toggle
  5. Enter your API Key
  6. Enter your List ID (Audience ID)
  7. Save changes

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Field Mapping

Spike maps these form fields to Mailchimp:
Form FieldMailchimp Field
emailEmail address (required)
name or first_nameFirst name
last_nameLast name
Your form must have an email field for Mailchimp integration to work.

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Double Opt-in

By default, subscribers are added with “subscribed” status. To use double opt-in, configure it in your Mailchimp audience settings.

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Troubleshooting

  • Verify the API key is correct (check the data center suffix)
  • Ensure the List ID exists
  • Check that the email field is present in submissions
If an email is already in the list, Mailchimp won’t create a duplicate. This is normal behavior.
Mailchimp validates emails. Invalid or disposable emails may be rejected.