GraphQL With Etherscan APIs

Getting Started

To get started using the GraphQL Etherscan API, follow these steps:

1. Clone this repository
2. Run npm install to install dependencies
3. Create an Etherscan API key (explained below)
4. Start the Apollo server (explained below)
5. Make GraphQL queries against the server (example below)

Benefits of using GraphQL API

Wrapping the Etherscan REST APIs in a GraphQL API provides the following benefits:

• Query multiple related resources in a single API call
• Strong typing system
• Intuitive query language
• Built-in documentation

Create an Etherscan API Key

To use the Etherscan APIs, you'll need an API key. Follow these steps:

1. Sign up for an Etherscan account at https://etherscan.io/register
2. Go to https://etherscan.io/myapikey to generate an API key
3. Add the API key to a .env file as ETHERSCAN_API=your_api_key

Overview of GraphQL Etherscan API endpoints

The GraphQL API wraps the following Etherscan REST endpoints:

• etherBalanceByAddress - Get ETH balance for an address
• totalSupplyOfEther - Get total ETH supply
• latestEthereumPrice - Get latest ETH price
• blockConfirmationTime - Get estimated block confirmation time

See the schema.graphql file for details

How to run Apollo Server

Starting the Apollo GraphQL Server:

1. Open your terminal on VSCode
2. Run the following command to start the server: node index.js
3. Upon successful startup, you should see this message: 🚀 Server ready at http://localhost:9000/
4. Access the Apollo Server by navigating to http://localhost:9000 on your browser

Sample GraphQL Query

Below is a sample GraphQL query to fetch the necessary data from Etherscan

query {
  etherBalanceByAddress {
    message
    result
  }
  totalSupplyOfEther {
    message
    result
  }
  latestEthereumPrice {
    message
    result {
      ethbtc
      ethusd
      ethusd_timestamp
    }
  }
  blockConfirmationTime {
    message
    result
  }
}