What is Ethereum (ETH) API used for?

APIs exposed by Ethereum RPC nodes are typically used for retrieving information stored on the blockchain, sending information to the blockchain, and building applications. Some developers also use aggregated APIs, such as CoinStats Ethereum API, which provide wallet balances, ERC-20 token holdings, and DeFi positions across multiple EVM-compatible networks. Its MCP server gives AI assistants and LLM-powered applications access to the same data.

What is the role of an Ethereum API in building decentralized applications (dApps)?

Decentralized applications rely on data from blockchain networks to fulfill user requests. Decentralized software built for Ethereum can't function independently - it needs a connection to blockchain nodes to respond to user requests, which API provides.

How to start using Ethereum API?

To get started with the ETH API by GetBlock, users need to sign up for a new account or sign in to their existing one. From there, they can generate RPC URLs and start using them immediately.

Are there any rate limits or usage restrictions on the Ethereum (ETH) API?

The usage of the Ethereum API is typically limited by the number of requests per second (RPS). With GetBlock's free services, users can send 20 requests per seconf, while paid options range from 100 RPS to 1,000+ RPS, depending on the plan.

Ethereum (ETH) API - Building Your Web3 Dapps

What is an Ethereum (ETH) API?

Ethereum API authorizes cryptocurrency users, developers, and applications to perform calls to ETH nodes and talk to the network.

An RPC endpoint is the network location where a program sends API requests to access the server’s data. In this context, API is the main tool for developers and dApps to set up a connection with the blockchain as opposed to hosting a node for the same purpose.

To provide these interactions, Ethereum nodes may operate with different communication protocols such as HTTP or WebSockets.

For example, after connecting a dApp to an Ethereum endpoint via API, application users can easily perform operations that make use of blockchain data in real time.

Imagine a user trading ETH for USDC on a decentralized exchange (DEX). The DEX platform verifies the user's Ethereum token balance by communicating with an RPC node via API. If successful, the DEX once again utilizes Ethereum API to forward the transaction request to the blockchain network for validation and execution.

Why use an Ethereum (ETH) API?

Aside from giving every user access to reading blockchain data, the primary role of ETH API is to enable seamless data exchange between decentralized software and the blockchain.

This connection serves various purposes: retrieving on-chain data, sending new transactions, or interacting with smart contracts.

Many developers prefer not to operate a full blockchain node since it requires substantial resources and technical knowledge to ensure proper maintenance.

As an alternative, node service providers like GetBlock offer ready-made Ethereum API to integrate into dApps and enjoy a flawless connection with the network and more advantages:

Accessibility: Using API does not require hosting and maintaining ETH nodes in-house, making it accessible to a wide range of users
Flexibility: Providers often support an extensive list of protocols, particularly valuable for developers building applications that interact with various blockchains
Cost-effectiveness: Clients can optimize the budget by choosing pricing plans that suit a specific use case
Enhanced user experience: Node providers have the infrastructure and expertise to deliver a consistently reliable service, minimizing the impact of potential issues

In other words, while applications’ credibility and user experience are dependent on consistent and reliable access to the blockchain, Ethereum API providers optimize this access.

Key Features of Ethereum API

GetBlock APIs provide access to all the functionalities essential for interacting with the Ethereum blockchain. Let’s explore some of them, each serving distinct purposes in Ethereum application development.

Key Features	Description	Example Use Cases
Real-time blockchain data	Enables applications to stay synchronized with the latest blockchain state; retrieve information directly from the ledger, including transaction and account details, block and network statistics	Blockchain explorers, Real-time analytics, Trading platforms
Wallet management	Includes functionalities like generating new addresses, checking balances, sending and receiving funds, and handling transaction history	Payment gateways, Exchange platforms
Transaction processing	Facilitates transaction creation, signing, fee estimation, and broadcasting for network confirmation	DeFi platforms, Wallet applications
Address validation	Helps verify address validity to ensure compliance with blockchain network standards before transaction processing	Web3 wallets, Exchanges, Payment platforms

Developers can access all the listed functionalities through GetBlock’s APIs without needing to directly manage the complex infrastructure that powers it.

How to Get Started with Ethereum (ETH) API

GetBlock has streamlined the process for developers to access API endpoints and interact with the Ethereum blockchain seamlessly.

This guide provides step-by-step instructions and useful tips to help users navigate the platform and successfully make their first interaction with Ethereum.

1. Creating the account

Begin by registering on the GetBlock website using your email address or connect a MetaMask wallet.

As a new user, you'll instantly gain access to 50,000 free daily CUs which can be a game-changer for beginner developers to explore the functionality of Ethereum APIs.

2. Obtaining endpoint URLs

From the dashboard, select the Ethereum protocol, choose between the mainnet or available testnets, and select one of the API interfaces. Clicking the "Get" button will generate an RPC link.

Users can create multiple endpoints as needed, all of which will be added to the "My Endpoints" list for convenient access and management.

3. Managing access tokens

All endpoint URLs regardless of the network selected follow a similar structure, where "<Access_Token>" is the unique private identifier assigned to each endpoint. This authentication method provides a higher level of security, keeping routing details hidden. Users can easily roll or deactivate unused or compromised endpoints. Additionally, detailed statistics are available for every separate endpoint.

API integration guide

Once generated, the endpoint URL can be further used for deploying smart contracts to Ethereum, connecting apps to the blockchain, or simply querying data.

For example, let’s retrieve the ETH balance for the random address using the ethers.js library. To do so, we initialize a JSON-RPC provider connected to the Ethereum network via the GetBlock API endpoint:

const { ethers } = require("ethers");
const provider = new ethers.JsonRpcProvider("https://go.getblock.io/<YOUR_ACCESS_TOKEN>");

Now we can write a function using the getBalance method to fetch the necessary data:

(async () => {
    const balance = await provider.getBalance('0x95222290DD7278Aa3Ddd389Cc1E1d165CC4BAfe5');
    console.log('Current Balance in ETH:',ethers.formatEther(balance));
})();

Response:

Current balance in ETH: 9.361568786805076392

Available Ethereum API Methods

To see what other actions or operations developers can perform through the API, let’s take a quick look at some essential RPC methods:

eth_getTransactionReceipt: returns transaction information for the given hash trans with logs
eth_sendRawTransaction: broadcasts a signed raw transaction to the Ethereum network
eth_estimateGas: estimates the gas cost of ETH transactions or contract invocations before submitting to the network
eth_call: executes a contract function call in a read-only manner without creating an on-chain transaction
eth_subscribe/eth_unsubscribe: allows tracking certain events on the blockchain

Discover more WebSocket and JSON-RPC methods offered by GetBlock API in our Ethereum documentation.

Higher-Level Ethereum Data APIs

JSON-RPC methods return raw on-chain state. It means reading an ERC-20 balance still requires one eth_call per token contract, and DeFi positions add another layer of contract calls and ABI handling for each protocol. For applications that need a full picture, there are specilized services like CoinStats Ethereum API.

Rather than raw RPC data, it returns ETH and ERC-20 balances for a wallet or DeFi positions across protocols like Aave, Uniswap, and Curve in one request. The endpoint also covers other EVM chains, including Polygon, Base, Arbitrum, and Optimism. Each API call costs a certain number of credits depending on the endpoint but the free tier gives you some amount of credits to start with. There's also an MCP Server if you're building with AI agents or LLM-based tools.

Aggregated data APIs complement RPC API – they handle wallet views and portfolio displays without manual token discovery, but raw RPC is still used for transaction signing, contract deployment, and event subscriptions.

Pricing and Plans for Ethereum (ETH) API

GetBlock offers a variety of tariffs and plans, fitting for both startups experimenting with new ideas or enterprises with heavy transaction loads.

Shared nodes provide users with access to peer-shared infrastructure. This option is suitable for applications that can tolerate some rate limiting. 50,000 free daily CUs are available within this service - paid plans start at $39.

Additionally, users can purchase additional of CUs or build a custom plan with custom limits. Payment options are flexible, too, including credit card, bank transfer, and cryptocurrency.

Dedicated ETH API

For high-traffic and mission-critical applications, dedicated servers are available. Dedicated node APIs make a big difference by providing unlimited requests, the highest possible speeds, and custom server specs.

This solution includes advanced features such as analytics, and redundant backup systems for optimized performance, along with the flexibility to deploy any protocol node upon request.

Users opt for this plan when launching highly scalable apps that require flawless node connection maintained by a team of professionals.

FAQ

What is Ethereum (ETH) API used for?
APIs exposed by Ethereum RPC nodes are typically used for retrieving information stored on the blockchain, sending information to the blockchain, and building applications. Some developers also use aggregated APIs, such as CoinStats Ethereum API, which provide wallet balances, ERC-20 token holdings, and DeFi positions across multiple EVM-compatible networks. Its MCP server gives AI assistants and LLM-powered applications access to the same data.
What is the role of an Ethereum API in building decentralized applications (dApps)?
Decentralized applications rely on data from blockchain networks to fulfill user requests. Decentralized software built for Ethereum can't function independently - it needs a connection to blockchain nodes to respond to user requests, which API provides.
How to start using Ethereum API?
To get started with the ETH API by GetBlock, users need to sign up for a new account or sign in to their existing one. From there, they can generate RPC URLs and start using them immediately.
Are there any rate limits or usage restrictions on the Ethereum (ETH) API?
The usage of the Ethereum API is typically limited by the number of requests per second (RPS). With GetBlock's free services, users can send 20 requests per seconf, while paid options range from 100 RPS to 1,000+ RPS, depending on the plan.