Marketing APIs for AI agents

Reference guides for the marketing apps an AI agent can work with: every endpoint, the permission each one needs, and how to give agents safe, governed access.

ActiveCampaign

29 endpoints

The ActiveCampaign API is how an app or AI agent works with a marketing and CRM account: adding and updating contacts, applying tags, subscribing people to lists, creating deals in the pipeline, and enrolling contacts in automations.

Updated 23 June 2026 · API v3
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beehiiv

35 endpoints

The beehiiv API is how an app or AI agent works with a beehiiv publication: adding a subscriber, reading a newsletter post, building an audience segment, or enrolling someone into an automation.

Updated 23 June 2026 · API v2
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Braze

41 endpoints

The Braze API is how an app or AI agent works with a Braze workspace: tracking users and their events, sending or scheduling messages, triggering a campaign or Canvas, managing catalogs and email templates, and exporting users by identifier or segment.

Updated 23 June 2026 · API Current
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Brevo

27 endpoints

The Brevo API is how an app or AI agent works with a Brevo account: managing contacts and lists, sending a transactional email, running an email or SMS campaign, and reading delivery and engagement reports.

Updated 23 June 2026 · API v3
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Campaign Monitor

51 endpoints

The Campaign Monitor API is how an app or AI agent works with an email marketing account: adding and importing subscribers onto lists, creating and sending campaigns, building segments, and sending transactional email.

Updated 23 June 2026 · API v3.3
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Constant Contact

53 endpoints

The Constant Contact API is how an app or AI agent works with a Constant Contact account: adding and updating contacts, organizing them into lists, tags, and segments, building and scheduling email campaigns, and reading who opened or clicked.

Updated 23 June 2026 · API v3
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Customer.io

36 endpoints

The Customer.io API is how an app or AI agent works with a Customer.io workspace: identifying people, tracking events and device tokens, sending transactional and broadcast messages, and reading back customers, segments, and message metrics.

Updated 23 June 2026 · API v1
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Drip

35 endpoints

The Drip API is how an app or AI agent works with a Drip account: adding and updating subscribers, applying and removing tags, recording events, subscribing people to campaigns and workflows, and sending broadcasts.

Updated 23 June 2026 · API v2
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GetResponse

48 endpoints

The GetResponse API is how an app or AI agent works with a GetResponse account: adding and updating contacts, building segments, sending newsletters, and running autoresponders and automation workflows.

Updated 23 June 2026 · API v3
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Iterable

34 endpoints

The Iterable API is how an app or AI agent works with an Iterable project: updating user profiles, tracking events, sending a transactional email, creating and triggering campaigns, and exporting analytics.

Updated 23 June 2026 · API Current
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Kit

28 endpoints

The Kit API is how an app or AI agent works with a creator's email marketing account: listing and creating subscribers, tagging people, adding them to a sequence or form, and sending a broadcast.

Updated 23 June 2026 · API v4
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Klaviyo

23 endpoints

The Klaviyo API is how an app or AI agent works with a Klaviyo account: reading and creating customer profiles, building lists and segments, tracking events, and sending email and text campaigns through flows.

Updated 23 June 2026 · API 2026-04-15
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Mailchimp

36 endpoints

The Mailchimp API is how an app or AI agent works with a Mailchimp account: adding and updating contacts in an audience, creating and sending campaigns, running automations, and reading how sends performed.

Updated 23 June 2026 · API 3.0
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MailerLite

44 endpoints

The MailerLite API is how an app or AI agent works with a MailerLite account: adding or updating subscribers, sorting them into groups, building segments, and creating and scheduling email campaigns.

Updated 23 June 2026 · API Current
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Mailgun

42 endpoints

The Mailgun API is how an app or AI agent works with an email-sending account: sending messages to recipients, managing sending domains and mailing lists, querying delivery and engagement events, and maintaining the bounce, unsubscribe, and complaint lists.

Updated 23 June 2026 · API v3
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Mailjet

37 endpoints

The Mailjet API is how an app or AI agent works with a Mailjet account: sending a transactional email, adding a contact to a list, scheduling a campaign, or reading how many messages were delivered and opened.

Updated 23 June 2026 · API v3
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Marketo

36 endpoints

The Marketo API is how an app or AI agent works with a Marketo Engage instance: reading and syncing leads, adding or removing them from a static list, reading the activities a lead has taken, and triggering a campaign to run against a set of people.

Updated 23 June 2026 · API v1
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Omnisend

30 endpoints

The Omnisend API is how an app or AI agent works with an Omnisend store: adding or updating a contact, sending an event like a started checkout to trigger an automation, syncing products and categories, recording carts and orders, and listing email, SMS and push campaigns.

Updated 23 June 2026 · API v5
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Postmark

40 endpoints

The Postmark API is how an app or AI agent works with a Postmark account: sending a transactional or bulk email, sending through a saved template, reading why a message bounced, or searching delivered messages and their opens and clicks.

Updated 23 June 2026 · API Current
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SendGrid

25 endpoints

The SendGrid API is how an app or AI agent works with a SendGrid account: sending an email to a recipient, adding or searching marketing contacts, organizing them into lists and segments, managing transactional templates, or reading delivery and engagement statistics.

Updated 23 June 2026 · API v3
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What is Bollard AI?

Control what every AI agent can do.

Bollard AI sits between a team's AI agents and the apps it runs on. Grant each agent exactly the access it needs, read or write, app by app, and every call is checked and logged.