Does it read my subscriber list?

No. Only sent campaigns and their summary figures are requested. Audiences and members are never read.

Which campaigns are included?

The 50 most recently sent. Drafts and scheduled campaigns are not read.

Mailchimp integration for Founder OS: what it reads and how to connect

Mailchimp integration

The Mailchimp connector reads the results of the campaigns you have sent: how many emails went out, and the open and click rates. It does not read your audiences or anyone’s email address.

Connected tools are part of Founder OS, which is on Pro Plus. Idea validation is on every plan, including Free. See every tool Founder OS reads.

What Founder OS reads from Mailchimp

Sent campaigns: title and send time
Emails sent
Open rate and click rate

What it leaves alone:

Audiences, subscribers and their email addresses
Campaign content
Automations, drafts and scheduled campaigns

How much each sync reads

The 50 most recently sent campaigns per sync

A sync runs when you connect, once a day after that, and whenever you press Sync.

Where the records are used

Kept as dated figures beside your other company records

How to connect Mailchimp

Connect with a key you create:

In Mailchimp, open Account, then Extras, then API keys.
Create a key and copy it. It ends with a dash and a data center, such as -us21.

Mailchimp documents this kind of key in its own guide, and you connect your account under Mailchimp’s terms.

Access and security

An API key from your Mailchimp account. Mailchimp cannot limit a key to read access, so the safeguard is ours: every request is checked on our server and anything that is not a read is refused before it leaves.

Every request to a connected tool is checked on our server, and anything that is not a read is refused before it leaves. It cannot move money, send a message or change a record. Keys and tokens are encrypted with AES 256 in GCM mode before they are stored, are never shown again, and are kept out of our logs. Disconnecting deletes the key and every record imported from the tool, in one step. For a tool you approved, we also ask the tool to end our access. The security page sets out the rest.

Questions

Does it read my subscriber list?: No. Only sent campaigns and their summary figures are requested. Audiences and members are never read.
Which campaigns are included?: The 50 most recently sent. Drafts and scheduled campaigns are not read.

An example of Founder OS reading four connected tools, Stripe, Razorpay, HubSpot and Slack, once a day, then working out monthly recurring revenue, churn and the customer count from the billing records by fixed formulas, each figure labelled Calculated.

Tools & workflows

All integrations Stripe integration Razorpay integration Paddle integration LemonSqueezy integration How connected tools are protected

Industry validators

edtech validator ai ml validator marketplace validator proptech validator

Comparisons

All tool comparisons Compare vs validatorai Compare vs ideaproof Compare vs founderpal Compare vs pitchbob

Guides

5 mistakes first time founders ai vs traditional startup validation create investor pitch deck 2026 understanding tam sam som

Trust & docs

Research methodology About the team Product changelog Plans and trial limits

Connect Mailchimp to Founder OS

Founder OS reads the tools your company runs on and keeps your figures, notes and decisions in one place. It is part of Pro Plus.

See Founder OS