eth_subscribe

Introduction

This API creates a new subscription for particular events. The node returns a subscription ID. For each event that matches the subscription, a notification with relevant data is sent together with the subscription ID. It consumes 120 CUs.

Parameter Description

Parameter	Type	Description
Event type	String	The type of event to listen to.
Optional parameters	String	Optional parameters to include to describe the type of event to listen to (e.g. newHeads, newPendingTransactions, logs).

Return Value

While the subscription is active, you will receive events formatted as an object described below:

Event Object:

jsonrpc: always 2.0.
method: always eth_subscription.
params: an object with the following fields:
- subscription: the subscription ID returned by the API that creates this subscription. This ID will be attached to all received events and can also be used to cancel the subscription using eth_unsubscribe.
- result: an object whose contents vary depending on the event type.

Request

wscat -c wss://your-http-endpoint/v1/<API-KEY> -x '{"jsonrpc":"2.0", "id": 1, "method": "eth_subscribe", "params": ["logs"]}'

Parent topic: Ethereum JSON-RPC APIs

Previous topic: eth_getBalance

Next topic: eth_unsubscribe

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