Backend API libraries
In order for a software application to interact with the Ethereum blockchain (i.e. read blockchain data and/or send transactions to the network), it must connect to an Ethereum node.
If you want to use a specific programming language to connect with an Ethereum node, there are many convenience libraries within the ecosystem that make this much easier. With these libraries, developers can write intuitive, one-line methods to initialize JSON-RPC requests (under the hood) that interact with Ethereum.
These libraries abstract away much of the complexity of interacting directly with an Ethereum node. They also provide utility functions (e.g. converting ETH to Gwei) so as a developer you can spend less time dealing with the intricacies of Ethereum clients and more time focused on the unique functionality of your application.
Alchemy - Ethereum Development Platform.
BlockCypher - Ethereum Web APIs.
Infura - The Ethereum API as a service.
Cloudflare Ethereum Gateway.
DataHub by Figment - Web3 API services with Ethereum Mainnet and testnets.
Nodesmith - JSON-RPC API access to Ethereum Mainnet and testnets.
Ethercluster - Run your own Ethereum API service supporting both ETH and ETC.
Chainstack - Shared and dedicated Ethereum nodes as a service.
QuickNode - Blockchain Infrastructure as a Service.
Python Tooling - Variety of libraries for Ethereum interaction via Python.
web3j - A Java/Android/Kotlin/Scala integration library for Ethereum.
Rivet - Ethereum and Ethereum Classic APIs as a service powered by open source software.
Nethereum - An open source .NET integration library for blockchain.
Tatum - The ultimate blockchain development platform.
Watchdata - Provide simple and reliable API access to Ethereum blockchain.
Zmok - Speed-oriented Ethereum nodes as JSON-RPC/WebSockets API.
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