Integrate the MailChimp API.Caddi writes and runs the integration for you.
MailChimp has a REST API. Self-serve for any Mailchimp account holder (generate an API key in account settings), though what the API can do depends on the account's plan level and the user's role.
- 99%of agent runs complete successfully
- ~45 minon average to build your first agent
- 1M+back-office tasks completed
The connection is a project before it does anything.
Before the first record moves: an app registration, credentials, token refresh, and somewhere to host and monitor the code. Limit of 10 simultaneous connections (429 on excess) and a 120-second timeout per call, with no per-customer limit increases.
Register an app, store MailChimp credentials, refresh tokens and code around the rate limits.
Connect your MailChimp account once. Caddi holds the connection.
The job doesn't stop at MailChimp.
An intake, a filing or a client update also runs through email, documents and the other systems your team works in. The MailChimp API only reaches MailChimp.
Each extra system is another API, another set of credentials, another integration to own.
One automation runs across every tool the job touches, each through its API.
Someone has to own the code.
API versions change, fields get added and your process moves.
A developer patches and redeploys the integration each time.
The person who does the work updates it by showing or describing the change. Every automation is reviewed before it runs in production, and every run is logged.
What the MailChimp API gives you
- Type
- REST (JSON)
- Authentication
- API key (HTTP Basic or Bearer) for your own account, or OAuth 2.0 to access other users' accounts
- Who can get access
- Self-serve for any Mailchimp account holder (generate an API key in account settings), though what the API can do depends on the account's plan level and the user's role.
- What it covers
- Audiences/lists and members, campaigns, automations, templates, reports, e-commerce store data, and batch operations.
- Limits
- Limit of 10 simultaneous connections (429 on excess) and a 120-second timeout per call, with no per-customer limit increases.
Official docs: mailchimp.com. Checked September 2026. Vendors change access terms, so confirm with MailChimp before you build.
When to build the MailChimp integration in-house
When you have engineers and the integration is your product, or you need one narrow sync between two systems and someone to own it. When the goal is getting MailChimp work off someone's desk, the build is the slow part, and Caddi does it for you.
What teams usually want the MailChimp API for
CRM → audience sync
Caddi mirrors the right CRM segments into MailChimp audiences and keeps unsubscribes and updates synced back.
Engagement write-back
Caddi pulls campaign engagement (opens, clicks, conversions) and writes the activity to the right CRM record.
Event-triggered campaign
When a CRM event happens (signed agreement, completed onboarding), Caddi triggers the right MailChimp campaign.
Everything Caddi does with MailChimp.
MailChimp API questions
Does MailChimp have an API?
Yes. MailChimp has a REST API, authenticated with API key (HTTP Basic or Bearer) for your own account, or OAuth 2.0 to access other users' accounts. The official documentation is at https://mailchimp.com/developer/marketing/.
How do I get access to the MailChimp API?
Self-serve for any Mailchimp account holder (generate an API key in account settings), though what the API can do depends on the account's plan level and the user's role.
Does the MailChimp API have rate limits?
Limit of 10 simultaneous connections (429 on excess) and a 120-second timeout per call, with no per-customer limit increases.
Can I connect MailChimp to my other tools without writing code against its API?
Yes. With Caddi you show the MailChimp task once, the way you'd train a new hire, and Caddi builds it as verified code that runs across MailChimp and the other tools the job touches. Steps that need a person's judgment are handed to Copilot or Claude, and Caddi monitors those too.
Do I need a developer to automate MailChimp with Caddi?
No. There is no integration code for you to write or maintain. Every automation Caddi builds for MailChimp is reviewed before it runs in production, and every run is logged.