RPC vs REST: The Complete Comparison (Plus Why Blockchain Uses RPC)

REST is the web standard. RPC is the blockchain standard.

Most developer education covers REST: resources, HTTP verbs, status codes. REST is what you learn when you build your first API. It is what powers most public web services. It is well-documented, widely understood, well-tooled.

But if you build on blockchain, you live in RPC. Every Ethereum call, every Solana query, every DeFi interaction runs over JSON-RPC. Not because developers chose it over REST. Because REST was never designed for what blockchain does.

This guide covers both patterns, compares them directly with code, and explains the fork in the road: why web development chose REST, why blockchain chose RPC, and when each one is the right tool.

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What is REST?

REST (Representational State Transfer) is an architectural style for building APIs around resources. A resource is any object you want to expose: a user, an account, a transaction, a product. Each resource gets a URL, and HTTP verbs define what you do to it.

GET    /accounts/0x742d...        → read the account
POST   /accounts                  → create an account
PUT    /accounts/0x742d.../name   → update a field
DELETE /accounts/0x742d...        → delete the account

REST is:

• Resource-oriented: everything is a noun (account, user, order)
• Stateless: each request carries all the information needed. No session on the server.
• Discoverable: the URL structure tells you what the API can do
• Standard: uses HTTP verbs and status codes that every developer already knows

REST is the right choice for public APIs, web applications, and any interface where external developers need to understand and use it without deep documentation.

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What is RPC?

RPC (Remote Procedure Call) is a communication pattern built around actions. Instead of interacting with resources via URLs and HTTP verbs, you call a function by name and pass arguments.

// RPC: call a function
eth_getBalance("0x742d...", "latest")

// vs REST: interact with a resource
GET /accounts/0x742d.../balance

JSON-RPC 2.0 is the most common implementation. Every request is a POST to a single endpoint, with the function name and arguments in the JSON body:

{
  "jsonrpc": "2.0",
  "method": "eth_getBalance",
  "params": ["0x742d35cc6634c0532925a3b8d4c9b8a8f3b51b96", "latest"],
  "id": 1
}

RPC is:

• Action-oriented: everything is a verb (getBalance, sendTransaction, getLogs)
• Stateless: same as REST. Each request is independent.
• Compact: one endpoint, one message format, no verb/URL mapping needed
• Fast: less overhead than REST for high-frequency internal calls

RPC is the right choice for internal service communication, action-heavy operations, and blockchain. More on that below.

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RPC vs REST: Direct Comparison

	REST	RPC (JSON-RPC)
Mental model	Resources (nouns)	Actions (verbs)
HTTP method	GET, POST, PUT, DELETE	POST only
Endpoint structure	One URL per resource	Single endpoint
Operation defined by	HTTP verb + URL	method field in body
Message format	Varies (JSON, XML, etc.)	JSON
Discoverability	High (URL structure is readable)	Requires docs
Error handling	HTTP status codes (404, 500)	Error object in response body
Blockchain standard	No	Yes
Best for	Public APIs, CRUD, web apps	Blockchain, internal services, high-frequency ops

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Side by Side: REST vs JSON-RPC Code Examples

The clearest way to understand the difference is to see both patterns solving the same problem.

Reading a wallet balance:

// REST approach (hypothetical - blockchain does not have a REST API)
const response = await fetch('https://api.example.com/accounts/0x742d.../balance');
const data = await response.json();
console.log(data.balance);

// JSON-RPC (how blockchain actually works)
const response = await fetch('https://eu.endpoints.matrixed.link/rpc/ethereum?auth=YOUR_KEY', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    jsonrpc: '2.0',
    method: 'eth_getBalance',
    params: ['0x742d35cc6634c0532925a3b8d4c9b8a8f3b51b96', 'latest'],
    id: 1
  })
});
const data = await response.json();
console.log(data.result); // hex-encoded wei value

Calling a smart contract function:

// REST (does not exist for blockchain)
// GET /contracts/0xUniswap.../price?token=USDC

// JSON-RPC (what every DeFi protocol actually does)
const response = await fetch('https://eu.endpoints.matrixed.link/rpc/ethereum?auth=YOUR_KEY', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    jsonrpc: '2.0',
    method: 'eth_call',
    params: [{
      to: '0xUniswapPoolAddress',
      data: '0xEncodedFunctionCall'
    }, 'latest'],
    id: 1
  })
});

With ethers.js, the library handles the JSON-RPC construction for you:

import { ethers } from "ethers";

const provider = new ethers.JsonRpcProvider(
  "https://eu.endpoints.matrixed.link/rpc/ethereum?auth=YOUR_KEY"
);

// This looks like a local function call
// Under the hood it sends a JSON-RPC request
const balance = await provider.getBalance("0x742d...");

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Why Blockchain Uses RPC (Not REST)

This is the section that every other article on this topic misses.

REST was never an option for blockchain. Not because someone evaluated REST and rejected it. Because the mental model of REST (resources with CRUD operations) does not map to how blockchain works.

Blockchain operations are actions, not resources.

Consider what a blockchain application actually needs to do:

• eth_sendRawTransaction: broadcast a signed transaction
• eth_call: execute a read-only contract function
• eth_getLogs: retrieve event logs matching a filter
• eth_estimateGas: calculate gas cost for a transaction

None of these are CRUD operations on a resource. You cannot map them to GET, POST, PUT, DELETE in any sensible way. They are procedure calls. RPC is built for procedure calls.

Blockchain state is not static.

REST assumes resources exist as stable objects you can read and modify. Blockchain state changes every block, roughly every 12 seconds on Ethereum. Every read needs a block reference ("latest", "earliest", or a specific block number). There are no stable resource URLs.

The standard is enforced at the protocol level.

The Ethereum JSON-RPC specification (EIP-1474) is the universal interface every node implements. Every EVM chain implements the same spec: Ethereum, Polygon, Arbitrum, Base, BNB Chain, Avalanche, Optimism. A method that works on Ethereum works identically on every EVM chain.

Solana, Cosmos, Bitcoin: all use their own RPC specifications. Different method names, same protocol pattern.

Every wallet and library already speaks JSON-RPC.

MetaMask sends JSON-RPC requests to nodes. ethers.js sends JSON-RPC requests. web3.js, viem, wagmi: all of them. When you write provider.getBalance(address), the library constructs and sends a eth_getBalance JSON-RPC request. You are always in RPC when you build on blockchain, whether you know it or not.

The protocol is predictable, standardized, battle-tested at scale. It is the foundation production infrastructure is built on.

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When to Use REST vs RPC

Use REST when:

• You are building a public API for external developers to consume
• Your operations map cleanly to CRUD (create, read, update, delete)
• Discoverability matters: you want developers to explore your API from the URL structure
• You are building standard web application backends
• Third-party tooling and REST client libraries matter to your workflow

Use RPC (JSON-RPC) when:

• You are building any blockchain application (always JSON-RPC, no choice here)
• Your operations are actions rather than resource manipulations
• You are building internal service-to-service communication at scale
• Performance and message compactness matter
• You control both client and server (tight coupling is acceptable)

The practical reality for blockchain developers:

If you are building a dApp, a trading bot, a DeFi protocol, or any application that reads or writes blockchain state, you are using JSON-RPC. The question is not whether to use RPC. It is which JSON-RPC provider handles your volume reliably.

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RPC vs REST vs gRPC vs GraphQL

Quick reference for the full landscape:

	REST	JSON-RPC	gRPC	GraphQL
Mental model	Resources	Functions	Functions	Graph queries
Transport	HTTP	HTTP/WebSocket	HTTP/2	HTTP
Format	JSON/XML	JSON	Protocol Buffers (binary)	JSON
Blockchain standard	No	Yes	No	No
Best for	Public APIs	Blockchain, internal	High-perf microservices	Flexible data fetching
Learning curve	Low	Low	Medium	Medium

gRPC uses binary serialization (Protocol Buffers) instead of JSON, making it faster than JSON-RPC for pure server-to-server throughput. It is common in microservices infrastructure. It is not used for blockchain node communication. Blockchain networks use JSON-RPC.

GraphQL is a query language that lets clients specify exactly what data they need. Useful for complex frontend data fetching. Not used as a blockchain node interface.

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FAQ: RPC vs REST

Why is RPC faster than REST?

For JSON-RPC specifically, the speed difference versus REST is small. Both use HTTP and JSON. The real performance difference comes with gRPC, which uses binary serialization (Protocol Buffers) and HTTP/2, reducing payload size and connection overhead significantly. For blockchain applications, JSON-RPC performance depends on the infrastructure behind the endpoint, not the protocol itself.

What is the difference between RPC and REST?

REST organizes communication around resources accessed via URLs and HTTP verbs. RPC organizes it around calling functions by name. REST: GET /users/123. RPC: getUser({id: 123}). For blockchain: REST does not exist as a node interface. JSON-RPC is the only standard.

How do I identify a REST vs RPC call?

REST calls use different HTTP verbs (GET, POST, PUT, DELETE) on different resource URLs. RPC calls are almost always HTTP POST to a single endpoint, with the function name inside the request body as a method field.

What does RPC stand for?

Remote Procedure Call. A protocol that lets a program call a function running on a different computer and receive the result, as if the function ran locally.

Why use RPC instead of REST?

For action-oriented operations that do not fit resource URLs. For internal service communication where tight coupling is acceptable. For blockchain development specifically, there is no REST alternative. JSON-RPC is the protocol every blockchain node exposes.

Is RPC still used?

Massively. Every major blockchain on earth uses JSON-RPC. gRPC powers infrastructure at Google, Netflix, and most modern microservice architectures. RPC is not legacy technology. It is the foundation of the highest-volume distributed systems running today.

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Conclusion

REST and RPC are not competing standards where one wins. They solve different problems.

REST is the right pattern for public APIs, CRUD applications, and interfaces built for external developers. RPC is the right pattern for action-heavy internal communication, and the only standard that exists for blockchain.

If you are building on Ethereum, Solana, or any major chain, you are building on JSON-RPC. The infrastructure underneath those calls determines whether your application performs or fails under load.

BoltRPC processes 2 billion JSON-RPC requests daily across 19 networks, trusted by Chainlink, Gains Network, Enjin, Tiingo.

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