Introduction¶

Backbone's websocket endpoint provides support for Pub/Sub API as well as JSON-RPC filter support. The regular Ethereum API is also supported and documented in the 'examples' portion of 'Ethereum API'

All examples in this reference section uses WSCAT, but will work with any tool that supports websockets.

Some tools you can use for making these requests

• WSCAT
• Advanced Rest Client

EXAMPLE¶

The following is an example showing a connection to the WebSockets endpoint and using subscriptions through web3.js 1.0

NOTE: web3.js 1.0.0-beta.34 has an open issue with request headers. (https://github.com/ethereum/web3.js/issues/1559) Users will have to revert to version 1.0.0-beta.33 to avoid the issue.

const Web3 = require("web3");

let web3 = new Web3(
  new Web3.providers.WebsocketProvider("wss://mainnet.backbonecabal.xyz/ws")
);

const instance = new web3.eth.Contract(<abi>, <address>);

instance.getPastEvents(
    "SomeEvent",
    { fromBlock: 0, toBlock: "latest" },
    (errors, events) => {
        if (!errors) {
            // process events
        }
    }
);