On a Free/Starter plan, you can create up to 20 Streams, and up to 200 streams for paid plan with separate configs, and multiple addresses can be added to a single stream config, "listen to all addresses" feature can also be used with a single stream config for our paid plans plans.
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You can contact our support team at [email protected] if you need a higher limit, we can support an unlimited number of streams.

You can also apply different filters for different contract addresses within the same Stream by following the method described here.