To use the eth_subscribe method on the Avalanche C-Chain, ensure that the end of your URL includes ext/bc/C/ws.

Parameters

subscription name

array

REQUIRED

The type of event you want to subscribe to (i.e., newHeads, logs, newPendingTransactions). This method supports the following subscription types:

newHeads

string

Fires a notification each time a new header is appended to the chain, including chain reorganizations

logs

string

Returns logs that are included in new imported blocks and match the given filter criteria

newPendingTransactions

string

Returns the hash for all transactions that are added to the pending state and are signed with a key that is available in the node

data

object

The arguments such as an address, multiple addresses, and topics. Note, only logs that are created from these addresses or match the specified topics will return logs

Returns

result

string

The hex encoded subscription ID. This ID will be attached to all received events and can also be used to cancel the subscription using eth_unsubscribe

Request

1
import { Core } from '@quicknode/sdk'
2

3
const core = new Core({
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  endpointUrl: "",
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})
6

7
core.client
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    .watchBlocks(
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      {
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        onBlock: block => console.log(block),
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        poll: false
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      }
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    )
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1
import { Core } from '@quicknode/sdk'
2

3
const core = new Core({
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  endpointUrl: "",
5
})
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core.client
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    .watchBlocks(
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      {
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        onBlock: block => console.log(block),
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        poll: false
12
      }
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    )
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1
wscat -c  \
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# wait for connection
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{"id":1,"jsonrpc":"2.0","method":"eth_subscribe","params":["newHeads"]}

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wscat -c  \
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# wait for connection
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{"id":1,"jsonrpc":"2.0","method":"eth_subscribe","params":["newHeads"]}

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