AsyncAPI channel · Helius · Helius WebSocket APIs

blockSubscribe

Subscribe to new blocks at a given commitment. Standard Solana PubSub method. Marked unstable by Solana; per Helius docs this is NOT supported on LaserStream WS, but is available on standard Helius mainnet/devnet WS endpoints.

Open source AsyncAPI → All Helius channels Helius provider profile
Provider: Helius AsyncAPI: v2.6.0 Spec: Helius WebSocket APIs Operations: 2 Messages: 4

Channel address

blockSubscribe

Operations

publish
blockSubscribe
Open a blockSubscribe subscription.
blockNotification
Block notifications.

Messages

blockSubscribe
blockSubscribe request
Content-Type: application/json
blockUnsubscribe
blockUnsubscribe request
Content-Type: application/json
jsonRpcResponse
Response to a subscribe / unsubscribe request — carries the subscription id (subscribe) or a boolean (unsubscribe).
Content-Type: application/json
blockNotification
blockNotification
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.

Browse every event-driven channel on the APIs.io network or compare with the broader Naftiko capability, Agent Skill, and MCP server surfaces of the same providers.