About Rubic, Cross-chain tools March 12, 2025

7 Best Crypto APIs of 2025 (Free & Paid)

TL;DR

Crypto APIs streamline Web3 development by offering pre-built methods for reading/writing data, interacting with DEXs, and fetching price feeds.
Key benefits include faster development, secure and scalable infrastructure, reliable real-time and historical data, and blockchain interoperability.
Top free and paid API providers in 2025 include Alchemy, Moralis, Bitquery, Covalent, QuickNode, Token Metrics, and Rubic.
Alchemy and Moralis excel at NFT, token, and smart contract support on multiple EVM chains with generous free tiers.
Bitquery, Covalent, and QuickNode offer broad chain coverage—up to 100+ blockchains—with standardized data and high-performance access.
Rubic’s Cross-Chain API & SDK stand out for seamless swaps across 100+ blockchains, liquidity aggregation from 360+ DEXs, customizable UI, and monetization options.

The cryptocurrency landscape is evolving rapidly, presenting both immense opportunities and complex challenges. To navigate this dynamic market effectively, developers, traders, and businesses alike need robust tools to access and process crypto data. Crypto APIs are powerful interfaces that bridge the gap between applications and blockchain networks, providing essential insights and functionalities.

Whether you’re a seasoned developer or just starting your crypto journey, you’ll find valuable information to help you make informed decisions. In this SEO-optimized blog post, we’ll explore the 7 best crypto APIs for developers, covering both free crypto APIs and paid options, and highlight why Rubic’s Cross-Chain API and SDK stands out as a game-changer for projects requiring seamless interoperability across 100+ blockchains.

What Is a Crypto API?

A crypto API, or blockchain API, is a set of programming interfaces that allow developers to interact with blockchain networks programmatically. These APIs provide access to essential blockchain functionalities, such as:

Reading data: Fetching transaction history, token balances, or smart contract states.
Writing data: Sending transactions or deploying smart contracts.
Interacting with decentralized exchanges (DEXs): Enabling token swaps across chains.
Accessing wallet integrations: Supporting user authentication and transactions.
Fetching real-time price data: Providing market data for tokens and cryptocurrencies.

For example, a crypto API might be used to display the current price of Bitcoin, enable a token swap between Ethereum and Binance Smart Chain, or retrieve NFT metadata for a decentralized marketplace. Essentially, crypto APIs serve as the backbone of many Web3 applications, from decentralized exchanges and wallets to analytics platforms and gaming dApps.

Why Are Crypto APIs Essential for Web3 Development?

Crypto APIs are indispensable for modern Web3 development for several reasons:

Speed Up Development Time: By providing pre-built functions and data access, APIs allow developers to focus on creating innovative features rather than managing low-level blockchain interactions.
Enable Interoperability and Cross-Chain Access: Many APIs support multiple blockchains, enabling developers to build applications that work seamlessly across different networks, a key requirement for the future of Web3.
Access Reliable Data: APIs provide real-time and historical data, such as token prices, liquidity pools, and transaction histories, which are crucial for building functional and user-friendly dApps.
Security and Scalability: Reputable API providers ensure their services are secure, scalable, and capable of handling high volumes of requests, which is essential for production-grade applications.
Chain Coverage: With support for multiple blockchains, developers can choose APIs that align with their project’s specific needs, ensuring broader compatibility and reach.

In short, crypto APIs empower developers to build faster, more secure, and more versatile applications while reducing the complexity of working directly with blockchain nodes.

7 Best Crypto APIs for 2025 (Free & Paid Options)

Now that we know why APIs are essential for Web3, specifically for dApp development, let’s discuss the best crypto APIs that can speed up your development effectively. Some of them are free crypto API, and others have paid plans:

1. Alchemy

What it offers: Alchemy is a leading blockchain development platform that provides a comprehensive suite of APIs for building dApps on various blockchains.

Key features: Enhanced APIs for NFTs, tokens, and smart contracts; reliable infrastructure; real-time data feeds; and developer tools like monitoring and analytics.
Supported chains: Ethereum, Polygon, Arbitrum, Optimism, and other EVM-compatible chains.
Ideal use case: Ideal for developers building NFT marketplaces, DeFi protocols, or analytics platforms.
Free vs. paid: Offers a free crypto API tier with limited usage, as well as paid plans for higher scalability.

2. Moralis

What it offers: Moralis provides a suite of Web3 APIs and RPC nodes, offering rich blockchain data across multiple chains.

Key features: Cross-chain support, APIs for wallets, NFTs, tokens, DeFi, and more; historical data; and real-time updates.
Supported chains: Multiple EVM-compatible blockchains, including Ethereum, Polygon, and Binance Smart Chain.
Ideal use case: Perfect for building dApps that require in-depth blockchain data, such as portfolio trackers or DeFi dashboards.
Free vs. paid: Offers a free crypto API tier, with paid plans for higher usage limits.

3. Bitquery

What it offers: Bitquery is a blockchain data platform that provides APIs for over 40 blockchain chains.

Key features: Real-time data via WebSockets, historical data access, specialized datasets (e.g., transactions, balances, NFTs), and integration with major cloud providers like AWS and Snowflake.
Supported chains: Over 40 blockchains, including Bitcoin, Ethereum, Solana, and Polygon.
Ideal use case: Best for developers building multi-chain applications like crypto wallets, tax tools, or analytics dashboards.
Free vs. paid: Offers a free crypto API tier, with paid plans based on a points system for higher usage.

4. Covalent

What it offers: Covalent is a decentralized data infrastructure that provides a unified API for accessing blockchain data across multiple chains.

Key features: Support for over 100 blockchains, standardized data formats, free crypto API tier, and developer tools like SDKs and UI Kits.
Supported chains: Over 100 blockchains, including Ethereum, Solana, and Polygon.
Ideal use case: Ideal for developers who need to work with data from multiple blockchains in a standardized way, such as cross-chain dApps or analytics platforms.
Free vs. paid: Offers a free crypto API tier, with paid plans for enterprise-level usage.

5. QuickNode

What it offers: QuickNode is a blockchain development platform that provides high-performance access to over 60 blockchains.

Key features: High-performance RPC and REST APIs, real-time data feeds, serverless functions, Layer 2 rollup deployment, and IPFS storage.
Supported chains: Over 60 blockchains, including Ethereum, Solana, Polygon, and Binance Smart Chain.
Ideal use case: Best for developers who prioritize speed and scalability, such as those building trading platforms or DeFi applications.
Free vs. paid: Offers a free crypto API tier, with paid plans for higher performance and additional features.

6. Token Metrics API

What it offers: Token Metrics is a crypto research and trading platform that provides an API for accessing real-time and historical crypto data, along with AI-powered insights.

Key features: Real-time and historical market data for over 5,000 tokens, AI-powered buy/sell signals, proprietary grades, and backtesting capabilities.
Supported chains: Focuses on major exchanges and tokens rather than specific blockchains.
Ideal use case: Perfect for traders and investors who need actionable data and insights, as well as developers building trading bots or analytics tools.
Free vs. paid: No free crypto API tier; paid plans only.

7. Rubic’s Cross-Chain API and SDK

What it offers: Rubic’s Cross-Chain API and SDK provide developers with tools to integrate cross-chain functionality into their dApps.

Key features: Support for 100+ blockchains, aggregation of 360+ DEXs, bridges, and intent protocols; best rate finder; customizable UI/UX; and monetization options (up to 50% of trading fees).
Supported chains: 100+ blockchains, including EVM and non-EVM chains like Solana, Avalanche, and more.
Ideal use case: Best for developers building cross-chain applications, such as wallets, dApps, games, or NFT platforms, that require seamless interoperability.
Free vs. paid: Rubic offers one of the best free crypto API to use, with monetization opportunities through trading fees.

Comparing the Best Crypto APIs (At a Glance)

To help you choose the right crypto API for your project, here’s a quick comparison of the top 7 crypto APIs:

API Provider	Chains Supported	Main Use Case	Free Tier	Cross-Chain	Dev Customization
Alchemy	Multiple EVM chains	dApp development, NFTs	Yes	Limited	High
Moralis	Multiple EVM chains	dApp development, data	Yes	Limited	High
Bitquery	40+ blockchains	Data analytics, multi-chain	Yes	Yes	Medium
Covalent	100+ blockchains	Cross-chain data, standardized	Yes	Yes	High
QuickNode	60+ blockchains	High-performance infrastructure	Yes	Limited	High
Token Metrics	5,000+ tokens	Trading insights, AI analytics	No	Limited	Medium
Rubic	100+ blockchains	Cross-chain swaps, interoperability	Yes	Yes	High

Choosing the Right Crypto API for Your Project

When selecting a crypto API, consider the following factors:

Chain Support: Ensure the API supports the blockchains relevant to your project.
Real-Time Data vs. Swap Functionality: If your project requires real-time data, consider APIs like Alchemy or Moralis.
Monetization and Flexibility: If you want to monetize your application, look for APIs like Rubic that offer revenue-sharing models.
Cross-Chain vs. Single-Chain: For projects requiring interoperability, choose APIs with strong cross-chain support, such as Rubic or Covalent.

If your project involves cross-chain functionality, I highly recommend exploring Rubic’s Cross-Chain API and SDK. It offers seamless swaps and bridges across 100+ blockchains, with customizable UI/UX and monetization opportunities.

What Makes Rubic’s Cross-Chain API & SDK Unique?

Rubic’s Cross-Chain API and SDK stand out for several reasons:

Extensive Chain Coverage: With support for 100+ blockchains, including both EVM and non-EVM chains, Rubic ensures unparalleled interoperability.
Liquidity Aggregation: By aggregating over 360 DEXs, bridges, and intent protocols, Rubic provides the best rates for cross-chain swaps, maximizing efficiency.
Customization and Flexibility: Developers can fully customize the UI/UX of their dApps, adjust trading fees, and integrate the swap widget seamlessly.
Monetization Opportunities: Partners can earn up to 50% of trading fees, providing a sustainable revenue stream.
Ease of Integration: With a simple widget and SDK, integration can be completed in as little as 10 minutes, making it accessible even for smaller teams.
Versatile Use Cases: Whether you’re building a wallet, dApp, game, launchpad, or NFT project, Rubic’s solutions enhance your project with cross-chain capabilities.

In essence, Rubic’s Cross-Chain API and SDK are designed to help developers build interoperable, user-friendly, and revenue-generating Web3 applications with minimal hassle.

Final Thoughts

Crypto APIs are the backbone of modern Web3 development, providing the tools necessary to build scalable, interoperable, and data-rich applications. Whether you’re a developer building a DeFi protocol, a trader seeking real-time insights, or a project lead looking to monetize your dApp, choosing the right crypto API is crucial.

Among the top contenders, Rubic’s Cross-Chain API and SDK shine for their extensive chain coverage, liquidity aggregation, and developer-friendly features. If your project requires cross-chain functionality, Rubic offers a seamless solution that not only simplifies integration but also opens up monetization opportunities.

Check out Rubic Cross-Chain API and SDK