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AyushKhandelwal9AyushKhandelwal9 

How can we access Change Events using rest or soap API without subscribing?

AnudeepAnudeep (Salesforce Developers) 
You can make a REST call in the below fashion
 
/vXX.X/event/eventSchema/<Schema_ID>?payloadFormat=COMPACT
 
/vXX.X/sobjects/<EventName>/eventSchema?payloadFormat=COMPACT

See this documentation to learn more