Hedera Consensus Service gRPC API

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The Hedera Consensus Service (HCS) gRPC API is a public mirror node managed by Hedera for the testnet. It offers the ability to subscribe to HCS topics and receive messages for the topic subscribed.

HCS Mirror Node Endpoints:

PREVIEWNET: hcs.previewnet.mirrornode.hedera.com:5600
TESTNET: hcs.testnet.mirrornode.hedera.com:5600 
MAINNET: mainnet-public.mirrornode.hedera.com:443 
Requests for the public mainnet mirror node 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.
Community supported mirror node information can be found here:
Community Mirror Nodes
Build a Mirror Node Client
V2
V1
If you building your client with a predefined Hedera network (previewnet, testnet, mainnet), you do not need to define the mirror client as it is built in. If you would like to modify the mirror client, you can use Client.<network>.setMirrorNetwork(<network>).

Public Mainnet Mirror Node

The default mainnet mirror node points to the whitelisted node when using Client.forMainnet(). To establish a connection to the public mainnet mirror node you will need to upgrade to one of the following versions of the SDK that now supports TLS connections.
Java: v2.0.6+
JavaScript: v2.0.23+
Go: v2.1.9+
Java
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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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JavaScript
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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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Go
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hedera.ClientForMainnet()
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client.SetMirrorNetwork([]string{"mainnet-public.mirrornode.hedera.com:443"})
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Constructor
Description
new MirrorClient(<endpoint>)
Initializes the MirrorClient object
Java
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final MirrorClient mirrorClient = new MirrorClient(MIRROR_NODE_ADDRESS);
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JavaScript
1
const mirrorClient = new MirrorClient(mirrorNodeAddress);
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Concurrent Subscription Limit
A single client can make a maximum of 5 concurrent subscription calls per connection. 
Subscribe to a topic
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Get topic messages
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REST API

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Integrating a Hedera Token Service Token

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Contents

Build a Mirror Node Client

Subscribe to a topic