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Hedera Mirror Node
The Hedera Consensus Service (HCS) gRPC API is a public mirror node managed by Hedera. It offers the ability to subscribe to HCS topics and receive messages for the topic subscribed. API docs for the mirror nodes can be found here:

Mainnet:

The non-production public mainnet mirror node serves to help developers build their applications without having to run their own mirror node. For production-ready mainnet mirror nodes please check out Dragonglass and Kabuto. When building your Hedera client via SDK, you can use setMirrorNetwork() and enter the public mainnet mirror node endpoint. The gRPC API requires TLS. The following SDK versions support TLS:
    Java: v2.0.6+
    JavaScript: v2.0.23+
    Go: v2.1.9+
Requests are throttled at 100 requests per second (rps). This may change in the future depending upon performance or security considerations. At this time, no authentication is required.
Java
JavaScript
Go
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//You will need to upgrade to v2.0.6 or higher
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Client client = Client.forMainnet();
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client.setMirrorNetwork(Collections.singletonList("mainnet-public.mirrornode.hedera.com:443"))
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//You will need to upgrade to v2.0.23 or higher
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const client = Client.forMainnet()
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client.setMirrorNetwork("mainnet-public.mirrornode.hedera.com:443")
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client := hedera.ClientForMainnet()
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client.SetMirrorNetwork([]string{"mainnet-public.mirrornode.hedera.com:443"})
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Mainnet Mirror Node Endpoint: mainnet-public.mirrornode.hedera.com:443 REST API Mainnet Root Endpoint: https://mainnet-public.mirrornode.hedera.com

Testnet:

The endpoints provided below allows developers to access the testnet mirror node which contains testnet transaction data.
HCS Testnet Mirror Node Endpoints: hcs.testnet.mirrornode.hedera.com:5600
REST API Testnet Root Endpoint: https://testnet.mirrornode.hedera.com

Previewnet:

The endpoints provided below allows developers to access the previewnet mirror node which contains previewnet transaction data.
HCS Preview Testnet Mirror Node Endpoints: hcs.previewnet.mirrornode.hedera.com:5600
REST API Preview Testnet Root Endpoint: https://previewnet.mirrornode.hedera.com
Last modified 2mo ago