Starknet WebSocket RPC

Stream Starknet data in real time over a WebSocket connection — new blocks, pending transactions, and contract events — instead of polling. Every SwiftNodes plan includes a Starknet WebSocket endpoint alongside HTTP, with flat-rate pricing and no KYC.

Endpoint

wss://rpc.swiftnodes.io/ws/starknet?key=YOUR_API_KEY

The HTTP endpoint for Starknet is https://rpc.swiftnodes.io/rpc/starknet?key=YOUR_API_KEY. One API key works for both, and across all 75+ supported chains.

Subscribe to Starknet in real time

import { Connection } from "@solana/web3.js";

const conn = new Connection("https://rpc.swiftnodes.io/rpc/starknet?key=YOUR_API_KEY", {
  wsEndpoint: "wss://rpc.swiftnodes.io/ws/starknet?key=YOUR_API_KEY",
});

// Subscribe to new slots on Starknet
const subId = conn.onSlotChange((slot) => console.log("slot", slot.slot));

What you can subscribe to

• Slot and root updates — track chain progress in real time
• Account changes — get notified when an account's data updates
• Program and signature subscriptions for live app state

Starknet is a Layer 2 (STARK validity rollup on Ethereum), with ~Variable block production; not a fixed EVM-style interval block times and soft confirmation on starknet within seconds to minutes; hard finality once the stark proof is verified on ethereum l1 finality. That cadence sets how frequently new-block subscriptions fire.

Frequently asked questions

See the full Starknet RPC page for chain details, or the WebSocket docs for the complete method list.