Web3.js vs Core API vs 0x
Build an ecosystem optimized for your goals while opening up new revenue streams.
Comparison Summary
Web3.js, Core API and 0x each address unique challenges in the web3 ecosystem, offering complementary strengths for builders. A JavaScript library providing a comprehensive API to interact with Ethereum and EVM-compatible blockchains. A Document Object Model for Web APIs designed to simplify API consumption and integration. 0x provides battle-tested APIs to embed fast, gasless, and deeply liquid crypto trading into decentralized applications. Together, these tools serve different but overlapping user needs, making them valuable components in a modern web3 development stack.
| At a Glance | |||
| Composability | |||
| Cross-Chain | |||
| Customizability | |||
| Developer Support | |||
| Ease of Integration | |||
| Performance | |||
| Key Features | |||
| Core Capabilities | Smart contract interaction, Event subscriptions, Account and transaction management, Ethereum Name Service (ENS) support, Utility helpers | Dynamic API Discovery, Open Source Repositories | Swap API, Gasless API, Trade Analytics API, Multi-chain support, Developer dashboard |
| Chain Support |  |     +40 |    +9 |
| Best For | DeFi Developers, Infrastructure Developers | Infrastructure Developers, DeFi Developers | DeFi Developers, Infrastructure Developers |
| Pricing | |||
| Free Tier | Free | — | Starter |
| Paid Features | — | — | 1 paid tiers |
| Custom Plans | — | — | — |
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