Validate your Mailchimp API key and get account info (name, email, total subscribers).

List email campaigns. Filter by status (save, paused, schedule, sending, sent) or audience list_id.

Get full details for a specific campaign including settings, tracking, and recipient info.

Create a new email campaign. Returns the campaign ID. Type: regular, plaintext, absplit, rss.

Update campaign settings. Only provide fields you want to change.

Send a campaign immediately. The campaign must be in 'save' status with content set.

Schedule a campaign. schedule_time must be ISO 8601 UTC (e.g. '2026-04-01T14:00:00+00:00').

Create a copy of an existing campaign. Returns the new campaign ID.

Send a test email for a campaign. test_emails: comma-separated addresses (max 5).

Get the HTML and plain-text content of a campaign.

Set campaign content. Provide html for custom content, or template_id to use a template.

Get performance report for a sent campaign — opens, clicks, bounces, unsubscribes, and more.

Get click details for a campaign — which URLs were clicked and how many times.

Get open details for a campaign — which subscribers opened and when.

List all audiences (mailing lists) with subscriber counts and stats.

Get detailed info and stats for a specific audience.

Create a new audience/list. Requires name, sender email, and company name.

List members of an audience. Filter by status: subscribed, unsubscribed, cleaned, pending, transactional.

Get details for a specific subscriber by email address.

Add a new subscriber or update if exists (upsert). Status: subscribed, pending, unsubscribed. Tags: comma-separated.

Archive (soft-delete) a subscriber. They can be re-added later via add_or_update_member.

Search for members by email or name across all audiences (or a specific one).

Get recent activity for a subscriber — opens, clicks, bounces, etc.

List all tags for an audience.

Add or remove tags on a subscriber. Provide comma-separated tag names for add_tags and/or remove_tags.

List saved segments for an audience.

List members in a specific segment.

Create a static segment from email addresses. emails: comma-separated list.

List available email templates.

Get a template's details and HTML content.

List classic automations with status and stats.

Pause all emails in a classic automation workflow.

Start all emails in a classic automation workflow.

Get details for a specific automation including trigger, recipients, and stats.

List all emails in an automation workflow with their status, delay, and position.

Permanently delete a campaign. Only works on campaigns that haven't been sent.

Unschedule a scheduled campaign, returning it to 'save' status.

Cancel a campaign that is currently sending. Only works during the send window.

Update audience settings. Only provide fields you want to change.

Batch subscribe multiple members at once. emails: comma-separated list (max 500).

Permanently delete a subscriber. Cannot be undone — the contact cannot be re-imported.

List merge fields (custom fields) for an audience — FNAME, LNAME, plus any custom ones.

Create a custom merge field. field_type: text, number, address, phone, date, url, dropdown, radio, birthday.

List interest categories (groups) for an audience — checkboxes, dropdowns, radio buttons, etc.

List interests (individual options) within a category — the actual checkbox/radio items.

Create a new email template from HTML content.

Delete a custom email template. Cannot delete Mailchimp's built-in templates.

Update a static segment — rename or add/remove members. emails: comma-separated.

Delete a segment from an audience.

List webhooks configured for an audience.

Create a webhook for audience events. Configure which events trigger the callback.

Delete a webhook from an audience.

Get unsubscribe details for a campaign — who unsubscribed and why.

Get delivery details — which members received the email and their status (sent, hard, soft).

List landing pages with their status, visits, and conversion stats.

Get details for a specific landing page including tracking stats.

Submit a batch of API operations. operations: JSON array of {method, path, body} objects. Max 500 ops.

List connected e-commerce stores (Shopify, WooCommerce, etc.) with revenue stats.

List products in a connected e-commerce store.

List orders from a connected store. Optionally filter by campaign_id to see revenue attribution.

Get e-commerce customer details including order count and total spent.

List abandoned carts from a connected store — useful for abandoned cart recovery campaigns.

List promo codes for a specific promo rule in a connected store.

Get monthly audience growth history — subscribes, unsubscribes, and net change over time.

Get subscriber location breakdown by country/region — where your audience lives.

Get email client usage for a campaign — Gmail, Apple Mail, Outlook breakdown.

Get A/B test (variate) results for a campaign — which combination won and performance of each.

List notes on a subscriber — internal CRM-style notes attached to a contact.

Add a note to a subscriber — useful for CRM-style contact management.

List files in the Mailchimp file manager. Filter by file_type: image, file.

Upload a file to the Mailchimp file manager. file_data_base64: base64-encoded file content.