Reference

a hype train kicks off on your channel.

Train State

• [[[event.level]]] — Starting level (usually 1)
• [[[event.total]]] — Total points contributed so far
• [[[event.progress]]] — Progress toward next level
• [[[event.goal]]] — Points needed for next level
• [[[event.started_at]]] — When the train started
• [[[event.expires_at]]] — When the train expires unless contributed to

Top & Last Contributor

• [[[event.last_contribution.user_name]]] — Most recent contributor
• [[[event.last_contribution.type]]] — "bits", "subscription", or "other"
• [[[event.last_contribution.total]]] — Their contribution amount
• [[[event.top_contributions.count]]] — How many top contributors are listed
• [[[event.top_contributions.0.user_name]]] — #1 contributor name
• [[[event.top_contributions.0.type]]] — #1 contribution type
• [[[event.top_contributions.0.total]]] — #1 contribution total

note: maps to the Twitch EventSub event channel.hype_train.begin.