What Is an RPC Endpoint and Why Does It Matter?
Updated October 22, 2026 · Spectrum Nodes
Short answer: An RPC endpoint is the URL your application sends Remote Procedure Call (RPC) requests to so it can talk to a blockchain node. Every balance check, transaction broadcast and event subscription travels through it. Its latency, uptime and rate limits decide how fast and reliable your app feels, which is why Spectrum Nodes runs nodes in several regions and gives you RPC and WebSocket URLs per region.
How Does an RPC Endpoint Work?
An RPC endpoint receives a request from your app, passes it to a blockchain node and returns the node's answer. Think of it as the door your application knocks on to talk to a blockchain.
A request is a short JSON message naming the method to run. This standard example asks an Ethereum node for the latest block number:
curl -X POST https://YOUR_ENDPOINT_URL \ -H "Content-Type: application/json" \ --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'
The node replies with the block number in hexadecimal, for example {"jsonrpc":"2.0","id":1,"result":"0x4b7"}.
For a full walkthrough of RPC itself, read what is an RPC.
What Is the Difference Between HTTP and WebSocket Endpoints?
An HTTP endpoint answers one request at a time, while a WebSocket endpoint keeps a connection open so the node can push updates to you. Use HTTP for reads and transaction broadcasts. Use WebSocket for subscriptions, such as new blocks or contract events, so your app doesn't have to keep asking.
What Is the Difference Between Public and Private Endpoints?
A public endpoint is open to anyone, while a private endpoint is authenticated and scoped to your project.
| Public endpoint | Private endpoint | |
|---|---|---|
| Access | Open to anyone | Authenticated, scoped to your project |
| Traffic | Shared with every user | Kept apart from public shared congestion |
| Good for | Testing and light use | Production apps |
Why Does the Endpoint Matter?
A slow or unreliable endpoint shows up as slow, unreliable software for your users. Three numbers decide how it behaves:
- Latency: the time from sending a request to receiving the full response. High latency means balances and prices load late.
- Uptime: the share of time the endpoint answers. When it is down, your app is down, even if the chain keeps producing blocks.
- Rate limits: the cap on how many requests you can send per second. Hit it and requests fail, often with a "429 Too Many Requests" error.
Treat all three as product features. See the 5 RPC metrics that matter and what happens when an RPC goes down.
How Do You Get an RPC Endpoint on Spectrum Nodes?
You create one in the Spectrum dashboard in four steps:
- Sign up at dashboard.spectrumnodes.com.
- Pick your chain from 200+ chains, then mainnet or testnet.
- Choose a pruned node for current state or an archive node for full history.
- Copy the RPC or WebSocket URL for the region closest to your users.
We run Spectrum on our own racks and hardware, serve over a billion requests a day at 99.99% uptime and are SOC 2 Type II attested.
FAQ
What is an RPC endpoint? An RPC endpoint is the URL an application uses to send RPC requests to a blockchain node. Wallets and dApps use it to read balances, broadcast transactions and subscribe to events.
What is the difference between an RPC node and an RPC endpoint? A node is the computer running the blockchain software. The endpoint is the URL you use to reach it, and a provider's endpoint can route your request to one of many nodes behind it.
Is a public RPC node good enough for production? Public endpoints are fine for testing, but they are shared with everyone and often rate limited. Production apps usually need a private endpoint whose latency and uptime they can check.
What is a WebSocket RPC endpoint? A WebSocket endpoint keeps a connection open between your app and the node. The node pushes new blocks or contract events to you, so you don't have to poll.
What makes a good RPC endpoint? Low latency, high uptime and rate limits that fit your traffic. A region close to your users also cuts the time each request spends travelling.