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Real-time Blockchain WebSocket Connection

Subscribe to real-time blockchain events via WebSocket API. Track transactions, blocks, and address activity across 32+ networks with low latency and high reliability.
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charts
charts

32+

Networks with WebSocket

24/7

Support

99,95%

Uptime

The Block
Sony
Poloniex
Change NOW
Shapeshift
Coingate
Mercuryo
Exodus
Enjin
Crypto.com
ParibuNET
Dione Protocol
The Block
Sony
Poloniex
Change NOW
Shapeshift
Coingate
Mercuryo
Exodus
Enjin
Crypto.com
ParibuNET
Dione Protocol
CoinSwitch
Elliptic
Cake Wallet
Trust
Bitpanda
BlockChair
Nexo
Tangem
CoinPaprika
CoinSwitch
Elliptic
Cake Wallet
Trust
Bitpanda
BlockChair
Nexo
Tangem
CoinPaprika

NOWNodes WebSocket API Benefits

Track wallet address activity across mainnet and testnet environments on 32+ supported blockchains.

Receive real-time updates on incoming and outgoing transactions for specific blockchain addresses using WebSocket subscriptions.

Events and address activity

Receive real-time updates on incoming and outgoing transactions for specific blockchain addresses using WebSocket subscriptions.

Get notified when new blocks are indexed to keep your application state, UI, and internal processes in sync with the blockchain.

New block notifications

Get notified when new blocks are indexed to keep your application state, UI, and internal processes in sync with the blockchain.

Minimize REST API polling by using a push-based WebSocket connection that delivers updates only when relevant events occur.

Reduce API polling

Minimize REST API polling by using a push-based WebSocket connection that delivers updates only when relevant events occur.

Access blockchain events without sharing sensitive information — no private keys, balances, or transaction payloads are stored or tracked.

Secure data

Access blockchain events without sharing sensitive information — no private keys, balances, or transaction payloads are stored or tracked.

More than an RPC provider

Dedicated WSS nodes

Reach out to deploy WSS nodes for any blockchain — even if the network is not available in shared access. We’ll provide pricing and deployment timelines tailored to your requirements.

Unlimited RPS Access

Handle high-throughput workloads with no request-per-second limits on all paid plans. Ideal for explorers, indexers, trading tools, and production-grade dApps.

Guaranteed 99.95% uptime

Reliable performance under any load — with failover nodes, global redundancy, and smart load balancing built in. We ensure stable performance and deliver on our SLA.

24/7 support

Our support team consists of experienced technical experts always ready to help. With a clear SLA, we guarantee fast, clear help, with first responses in under 3 minutes.

One API. 110+ blockchains

One RPC provider — 110+ blockchains and thousands of tokens. We regularly add new chains, including by request from our users. Check list of nodes.

Get started

Get started with WebSocket API in a few steps

Connect to real-time blockchain data in minutes — no complex setup or infrastructure management required

Create an account and select any paid plan for your budget

Step 1

Create an account and select any paid plan for your budget

Generate your unique API key directly from the NOWNodes dashboard.

Step 2

Generate your unique API key directly from the NOWNodes dashboard.

Choose the required WebSocket methods from the documentation

Step 3

Choose the required WebSocket methods from the documentation

Connect to the WSS endpoint and start sending API requests

Step 4

Connect to the WSS endpoint and start sending API requests

Trusted by

Exodus has used NowNodes since 2022 as a cost-effective alternative to running some of our own expensive in-house nodes. The NowNodes support team has always been responsive and friendly, consistently providing quick resolutions to any issues we've encountered.

We have been working with NOWNodes from the very beginning – and through all these years the service has been impeccable. The team has been ready to meet our strenuous requirements in 100% of cases and if anything stroke our fancy, NOWNodes always delivered – no questions asked. We're planning on using NOWNodes for years to come – and we hope the company keeps growing in the future. Good job, NOWNodes!

NOWNodes has been consistently and reliably providing RPC service for 50+ of the blockchains supported by Trust Wallet for several years now. On top of the wide number of chains they already listed, the team has always been open to adapt to our specific needs and add extra components and chains when asked

NOWNodes is our esteemed partner and one of the best providers out there on the market. Their work ethic and due diligence are impeccable!

NOWNodes has provided hybrix with a high availability and quality service product for over a year now. We would recommend this API provider to anyone looking for proper RPC connections to blockchain services.

NOWNodes have been very helpful every and supportive with any questions we have had and the service is perfect.

We've used the API service of NOWNodes for over a half year now and they have been simply magnificent with their service delivery. The API calls are efficient and their support is always a DM away from resolving issues that need attention.

Running campaigns with NOWNodes has been smooth and effective. The team is responsive, collaborative, and easy to work with. Looking forward to more successful initiatives together.

Your team and all engineers from Nownodes to provide us good service, program API, and support.

Frequently asked questions

What is a WebSocket connection?

A WebSocket connection is a persistent, bidirectional communication channel that allows applications to receive blockchain updates in near real time. Unlike traditional HTTP requests, a blockchain WebSocket connection stays open and delivers data as soon as events occur on the network.

How can I access the blockchain WebSocket API?

To access the blockchain WebSocket API, register on the platform, choose any paid plan, and generate an API key in the dashboard. Once the key is created, select the required method from the documentation and start sending requests to the blockchain WebSocket endpoints.

Which networks support the WebSocket API?

The blockchain WebSocket API is available for more than 32 networks, including Ethereum (ETH), Binance Smart Chain (BNB), Solana (SOL), Polygon (POL), and many other popular blockchains.

Which blockchain events can I subscribe to using WebSocket API?

The list of available blockchain events depends on the network and the underlying interface. For example, with Blockbook-based WebSocket connections, the following subscriptions are supported: new block notifications, new transaction events, address activity updates, and fiat rate updates.

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