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eth_subscribe

Network: Optimism Sepolia · Testnet · Chain ID 11155420 (0xaa37dc)

Counts as 1 request. See Request Counting.

eth_subscribe is available over WSS endpoints only. It creates a live subscription for event streams such as new heads or logs when the chain route has WSS enabled.

Parameters

  1. String - Subscription type, such as newHeads, logs, or newPendingTransactions.
  2. Object - Optional filter object for subscription types such as logs.

Request

{
  "jsonrpc": "2.0",
  "method": "eth_subscribe",
  "params": ["newHeads"],
  "id": 1
}

Code Examples

const ws = new WebSocket("wss://optimism-sepolia-rpc.blockreq.com/v1/rpc/public");

ws.onopen = () => {
  ws.send(JSON.stringify({
  "jsonrpc": "2.0",
  "method": "eth_subscribe",
  "params": [
    "newHeads"
  ],
  "id": 1
}));
};
ws.onmessage = (event) => {
  console.log(JSON.parse(event.data));
};

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