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OpenSea Stream API - TypeScript SDK

A TypeScript SDK for receiving updates from the OpenSea Stream API - pushed over websockets. We currently support the following event types on a per-collection basis:

  • item listed
  • item sold
  • item transferred
  • item metadata updates
  • item cancelled
  • item received offer
  • item received bid

This is a best effort delivery messaging system. Messages that are not received due to connection errors will not be re-sent. Messages may be delivered out of order. This SDK is offered as a beta experience as we work with developers in the ecosystem to make this a more robust and reliable system.



Please use Node.js version 16 or greater to make sure common crypto dependencies work.

  • Install this package: npm install @opensea/stream-js
  • Install types for phoenix: npm install --save-dev @types/phoenix
  • NodeJS only: Install required libraries: npm install ws node-localstorage

Getting Started


In order to make onboarding easy, we've integrated the OpenSea Stream API with our existing API key system. The API keys you have been using for the REST API should work here as well. If you don't already have one, you can create an API key in your OpenSea account settings.

Create a client


import { OpenSeaStreamClient } from '@opensea/stream-js';

const client = new OpenSeaStreamClient({


import { OpenSeaStreamClient } from '@opensea/stream-js';
import { WebSocket } from 'ws';
import { LocalStorage } from 'node-localstorage';

const client = new OpenSeaStreamClient({
  connectOptions: {
    transport: WebSocket,
    sessionStorage: LocalStorage

You can also optionally pass in:

  • a network if you would like to access testnet networks.
    • The default value is Network.MAINNET for all mainnet chains
    • Can also select Network.TESTNET for all testnet chains
  • apiUrl if you would like to access another OpenSea Stream API endpoint. Not needed if you provide a network or use the default values.
  • an onError callback to handle errors. The default behavior is to console.error the error.
  • a logLevel to set the log level. The default is LogLevel.INFO.

Available Networks

The OpenSea Stream API is available on the following networks:





To create testnet instance of the client, you can create it with the following arguments:

import { OpenSeaStreamClient, Network } from '@opensea/stream-js';

const client = new OpenSeaStreamClient({
  network: Network.TESTNET,

An API key is not needed for testnets, so any value is okay for token when network is Network.TESTNET.

Manually connecting to the socket (optional)

The client will automatically connect to the socket as soon as you subscribe to the first channel. If you would like to connect to the socket manually (before that), you can do so:


After successfully connecting to our websocket it is time to listen to specific events you're interested in!

Streaming metadata updates

We will only send out metadata updates when we detect that the metadata provided in tokenURI has changed from what OpenSea has previously cached.

client.onItemMetadataUpdated('collection-slug', (event) => {
  // handle event

Streaming item listed events

client.onItemListed('collection-slug', (event) => {
  // handle event

Streaming item sold events

client.onItemSold('collection-slug', (event) => {
  // handle event

Streaming item transferred events

client.onItemTransferred('collection-slug', (event) => {
  // handle event

Streaming bids and offers

client.onItemReceivedBid('collection-slug', (event) => {
  // handle event

client.onItemReceivedOffer('collection-slug', (event) => {
  // handle event

Streaming multiple event types

  (event) => {
    // handle event

Streaming order cancellations events

client.onItemCancelled('collection-slug', (event) => {
  // handle event

Subscribing to events from all collections

If you'd like to listen to an event from all collections use wildcard * for the collectionSlug parameter.


Types are included to make working with our event payload objects easier.


From a specific stream

All subscription methods return a callback function that will unsubscribe from a stream when invoked.

const unsubscribe = client.onItemMetadataUpdated('collection-slug', noop);


From the socket



See the contributing guide for detailed instructions on how to get started with this project.


MIT Copyright 2022 Ozone Networks, Inc.