AsyncAPI channel · QuickNode · QuickNode WebSocket Subscription API

`ethereum/newHeads`

Subscribe to new block headers on Ethereum (or any EVM chain) via `eth_subscribe` with the `newHeads` subscription type. The server returns a hex-encoded subscription id and then streams a notification for every new block header. Cancel with `eth_unsubscribe`.

Open source AsyncAPI → All QuickNode channels QuickNode provider profile

Provider: QuickNode AsyncAPI: v2.6.0 Spec: QuickNode WebSocket Subscription API Operations: 2 Messages: 5

Channel address

ethereum/newHeads

Operations

publish

subscribeEthNewHeads

Send eth_subscribe / eth_unsubscribe for newHeads

receiveEthNewHeads

Receive subscription id and newHeads notifications

Messages

EthSubscribeNewHeadsRequest

Subscribe to new block headers

Content-Type: application/json

EthUnsubscribeRequest

Cancel an active eth_subscribe subscription

Content-Type: application/json

EthSubscribeResponse

Returned subscription id (hex string)

Content-Type: application/json

EthUnsubscribeResponse

eth_unsubscribe response

Content-Type: application/json

EthNewHeadsNotification

eth_subscription newHeads notification

Content-Type: application/json

About AsyncAPI

The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.

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