HubSpot Marketing Events Extension

Name: Marketing Events Extension API
Brand: Marketing Events Extension
Availability: InStock

★ Only Publicly Available OpenAPI DocumentMarketingMarketing Automationoauth2, apiKey16 Endpoints

Install Jentic One Beta

Connect the Marketing Events Extension to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Marketing Events Extension, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Marketing Events Extension API.

Upsert a batch of events to keep HubSpot in sync with an external event platform

Record per-attendee state transitions (REGISTERED, ATTENDED, CANCELLED, NO_SHOW)

GET STARTED

Start building with Marketing Events Extension API

Explore with Jentic

View OpenAPI Document

For Agents

Register external marketing events and per-attendee state transitions in HubSpot so contact attendance is recorded against the CRM contact.

Use for: I need to register a new webinar as a HubSpot marketing event, Record that a contact attended a marketing event, Mark an event as cancelled in HubSpot, Search for marketing events by name

Not supported: Does not handle email sends, marketing campaign creation, or contact list management - use for marketing event registration and attendance state only.

Use Cases

Patterns agents use Marketing Events Extension API for, with concrete tasks.

★ Webinar Platform Sync

Companies running webinars on Zoom, On24, or GoToWebinar push every event and attendance update into HubSpot via this API. The events upsert endpoint keeps HubSpot in sync with the event platform, and the per-state attendance endpoints record who registered and who actually showed up. Marketing then segments and follows up based on attendance state.

Upsert event with externalEventId 'zoom-12345', name 'Q3 Product Launch Webinar', startDateTime '2026-09-15T17:00:00Z', then mark contactId 99887 as ATTENDED

Per-Attendee State Transitions

Every attendee moves through registration, attendance, and follow-up states. The /attendance/{externalEventId}/{subscriberState}/create endpoint records a new attendee in a given state, and the email-create variant accepts an email address for contacts that may not yet exist in HubSpot. The upsert variants handle the case where the attendee record might already be present.

Call POST /marketing/v3/marketing-events/attendance/zoom-12345/ATTENDED/email-create with email 'jane@example.com' and joinedAt timestamp

Event Lifecycle Management

When events get postponed or cancelled, every contact who registered needs the attendance record updated and HubSpot's view of the event marked accordingly. The cancel and complete endpoints transition the event itself, and the search endpoint helps the integration find existing events by name when an externalEventId is not known. Delete handles archival of events that should no longer appear in reports.

Call POST /marketing/v3/marketing-events/events/zoom-12345/cancel to mark the event cancelled and trigger downstream attendee updates

Agent-Driven Event Registration

An AI agent that runs the company's webinar operations uses Jentic to register attendees as they sign up on a third-party platform. It searches for 'register hubspot marketing event attendee', loads the schema, and posts the attendee state transition immediately so HubSpot's segmentation always reflects the current attendee list.

Search Jentic for 'mark hubspot event attendee', load the schema, and post the REGISTERED state transition for each new sign-up

Key Endpoints

16 endpoints — jentic publishes the only available openapi specification for the hubspot marketing events extension, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

POST

/marketing/v3/marketing-events/events/upsert

Upsert a batch of marketing events

POST

/marketing/v3/marketing-events/events/search

Search marketing events

POST

/marketing/v3/marketing-events/events/{externalEventId}/cancel

Cancel an event

POST

/marketing/v3/marketing-events/events/{externalEventId}/complete

Mark an event complete

POST

/marketing/v3/marketing-events/attendance/{externalEventId}/{subscriberState}/create

Record an attendee state transition by contactId

POST

/marketing/v3/marketing-events/attendance/{externalEventId}/{subscriberState}/email-create

Record an attendee state transition by email

GET

/marketing/v3/marketing-events/{appId}/settings

Get app-level marketing events settings

POST

/marketing/v3/marketing-events/events/upsert

Upsert a batch of marketing events

POST

/marketing/v3/marketing-events/events/search

Search marketing events

POST

/marketing/v3/marketing-events/events/{externalEventId}/cancel

Cancel an event

POST

/marketing/v3/marketing-events/events/{externalEventId}/complete

Mark an event complete

POST

/marketing/v3/marketing-events/attendance/{externalEventId}/{subscriberState}/create

Record an attendee state transition by contactId

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Your HubSpot credential is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'create a hubspot marketing event', and Jentic returns POST /marketing/v3/marketing-events/events/upsert with its input schema, including the externalEventId, name, and time fields, so the agent calls the right endpoint without browsing the reference docs.

Time to first call

FAQs

Specific to using Marketing Events Extension API through Jentic.

Why is there no official OpenAPI spec for the HubSpot Marketing Events Extension?

HubSpot does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call the HubSpot Marketing Events Extension via structured tooling. It is validated against the live API and kept up to date. Get started with Jentic One, the self-hosted execution layer.

What authentication does the HubSpot Marketing Events Extension API use?

It accepts the developer hapikey query parameter, OAuth 2.0 access tokens, the private-app-legacy header, and the hapikey query parameter as a legacy fallback. Jentic stores all of these in its encrypted vault and provides agents with scoped tokens at execution time.

Can I record attendance for a contact that does not yet exist in HubSpot?

Yes. Use POST /marketing/v3/marketing-events/attendance/{externalEventId}/{subscriberState}/email-create with the contact's email address. HubSpot creates or updates the contact record to match and records the attendance state in the same call.

What are the rate limits for the HubSpot Marketing Events Extension API?

Standard HubSpot API limits apply: 100 requests per 10 seconds per private app token and 110 per 10 seconds per OAuth app per portal. For high-volume webinar imports, use the events upsert batch endpoint and the email-upsert attendance variants instead of one call per attendee.

How do I register a marketing event through Jentic?

Search Jentic for 'create hubspot marketing event', load the schema for POST /marketing/v3/marketing-events/events/upsert, and execute with an array of events keyed by externalEventId. For one event at a time, POST /marketing/v3/marketing-events/events with the event payload.

Is the Marketing Events Extension API free?

API access is included with any HubSpot subscription that has Marketing Hub features. Marketing event records appear on contact timelines and in Marketing Hub reports; the depth of reporting depends on the Marketing Hub subscription tier.

Can I limit what my agent is allowed to do with the HubSpot Marketing Events Extension API?

Yes. Because you run Jentic One yourself, your own rules decide which of these operations the agent may call and which credential it uses. You can allow only the operations the agent needs, such as upserting events or searching events and recording attendance state by contactId or email, while leaving out others. Destructive operations like cancelling an event with the /cancel path are not available to the agent unless you explicitly add them.

HubSpot Marketing Events Extension

Connect the Marketing Events Extension to your agent

Capabilities

Start building with Marketing Events Extension API

Use Cases

Key Endpoints

Why Jentic?

Related APIs

FAQs