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Chat API providers have their pricing based on the number of monthly active users (MAUs) Some also account for additional parameters like storage, number of messages, function executions, and concurrent users. The more out-of-the-boxiness the chat API provides, the less customizability you get. Sendbird is a market leader focused on providing enterprise solutions based on building blocks that come with hefty pricing. It's a versatile API that supports chat, video, and voice messaging and has a helpdesk product.