Best Free Blockchain APIs of 2025

QuickNode simplifies blockchain infrastructure for teams big & small. A lightning-fast global API provides instant access to Ethereum, Solana, Bitcoin, Polygon, BSC, Fantom, Avalanche, Terra, Celo, Optimism, Arbitrum, Algorand, Harmony & Gnosis (xDai) networks. Access chain data via JSON-RPC over HTTPS or wss (websocket) endpoints. Monitor usage with analytics dashboard and ship faster with tools like 1-click WebHooks for smart-contract events, NFT, and ERC20 token APIs. Thousands of nodes launched; trusted by top blockchain projects & businesses; QuickNode is helping the blockchain ecosystem grow since 2017!

Venly is a blockchain technology provider that creates tools and products to help companies benefit from blockchain technology. We offer a whole technology stack to bring platforms, apps, and brands into Web3. We provide marketplaces, wallets, and NFT solutions to assist businesses in smoothly integrating web3 technology and onboarding customers. Our solutions use a Web2 interface that developers and users are already familiar with to make blockchain easy to use. Venly enables the adoption of blockchain by offering reliable and user-friendly software solutions. We are making blockchain accessible for everyone. Venly's products and services include: WALLET SOLUTIONS → Instant Web3 Wallets for Your Users NFT TOOLS → Your Complete NFT Toolkit MARKETPLACE SOLUTIONS → NFT Marketplace Built for the Mainstream SHOPIFY NFT APP → Sell NFTs in Your Shopify Store WEB3 GAMING TOOLKIT → Make Your Game Web3 Ready

GetBlock is a Blockchain-as-a-Service (BaaS) platform that provides a fast and easy API connection to full nodes from 50+ leading blockchain platforms. It allows you to request information on a node's chain without having to manually set it up with JSON-RPC or REST. This service is ideal for beginners and young entrepreneurs, as well for crypto developers and users. It is also suitable for those who do not have the resources or time to run their own full node. Register an account to get started with GetBlock. You will receive an API key and the relevant data on the dashboard.

Our DEX GraphQL APIs deliver instantaneous trading information for various decentralized exchange protocols spanning multiple blockchains. Users can retrieve trading data from platforms such as Kyber, Uniswap, 0x, Balancer, and PancakeSwap, among others. Utilizing this DEX trade data enables the creation of visual charts, in-depth analytics, the identification of arbitrage opportunities, and comprehensive market analysis of DEXs. Bitquery offers a suite of software solutions that systematically parse, index, and store blockchain data in a cohesive manner. Additionally, it provides market insights for individual projects and examines industry trends across diverse blockchain ecosystems. Furthermore, it facilitates money flow analysis crucial for blockchain investigations and compliance efforts, allowing users to trace the origins and destinations of funds. The APIs and analytics for Decentralized Finance (DeFi) protocols support extensive research opportunities in the realm of blockchain development, contributing significantly to the ongoing evolution of the industry. Overall, these tools empower developers and analysts to harness blockchain data effectively for a multitude of applications.

The easiest and fastest blockchain development platform. Unified framework for 40+ digital assets and 40+ blockchain protocols. One Javascript SDK that supports all 40+ blockchain protocols. Simplify your development by integrating any blockchain directly into your JavaScript Backend. WooCommerce allows you to create and sell NFTs from within your WooCommerce website. The plugin is free and easy to set up in minutes. Open-source key management system that secures your private keys, mnemonics and allows you to sign transactions on-premise. A command line interface for interacting with blockchains. Access our infrastructure via REST API, with unified commands across all supported Blockchains. You can quickly and easily create apps on any supported Blockchain without any previous blockchain experience.

Chainstack's APIs and software are used by thousands of businesses, large and small, to build, scale, and maintain blockchain applications. To ensure your security and control, Chainstack's APIs offer secure node connections and key security best practices. Invite other members to join your network and deploy their infrastructure using simple network management tools. You can build and deploy the blockchain protocol that suits your needs. The protocol will never be updated or modified again. Chainstack's managed services for blockchain make it easy to launch, join, and scale decentralized networks. You can now safely experiment with enterprise-grade tools and services and then run production. Continuously monitor and provision your resources.

Crypto APIs is a blockchain infrastructure provider that makes developing and managing Web 3 solutions easy and efficient. The infrastructure suite includes The company's product suite includes Blockchain Data, Blockchain Events, Blockchain Automations, Blockchain Tools, Non-Custodial Wallets and Market Data. Developers access all tools with one seamless integration. They can deploy over 100 endpoints from a single provider by using just one SDK. The company's REST APIs work with multiple blockchain mainnets and testnets. They are suitable for building diverse solutions, including digital banks, exchanges, wallets, custodians, lending products, and more. Companies like Chainlink, Ledger, Nexo, PayPal, and Prime Trust are already using Crypto APIs. Customers love Crypto APIs' white glove support and robust features, calling Crypto APIs' products "reliable, effective, and fast". The company is ISO/IEC 27001:2013 certified - it incorporates advanced encryption and the highest security standards to protect customers' data and digital assets.

Anyblock offers a Software-as-a-Service (SaaS) solution that grants Blockchain JSON-RPC access for various cryptocurrencies, including Bitcoin and Ethereum. Our blockchain API is designed for speed and reliability, typically delivering query responses in under 100 milliseconds. To ensure optimal performance, we utilize a load-balanced system supported by multiple nodes. For Ethereum, we employ Parity/OpenEthereum and Besu clients. Our customer support is exceptional, providing prompt and personalized responses along with technical guidance that includes code samples. Additionally, we offer comprehensive documentation, covering everything from API details to tutorials and frequently asked questions. This combination of features ensures that users have the resources they need to succeed.

Blockchair API provides developers, researchers, and businesses with access to data contained in 17 blockchains. The API supports numerous analytical queries like filtering, sorting, and aggregating blockchain data with high uptime. Blockchair is the first blockchain explorer which incorporates a multitude of different blockchains into one search engine. Unlike most blockchain explorers and cryptocurrency companies, Blockchair does not collect personal data, nor does Blockchair share it with third-party analytics companies and ad networks.

InfStones, a Softbank portfolio company, is an advanced, enterprise-grade Platform as a Service (PaaS) blockchain infrastructure provider headquartered in the United States and backed by leading venture capital investors. The company is trusted by the top blockchain companies globally, including Binance, BitGo, CoinList, Circle, Poloniex, imToken, Dune Analytics, Chainlink, Polygon, NuCyher, Near, and many more. InfStones is dedicated to breaking down the barriers of blockchain adoption and Web3 application development by providing developers worldwide with a rugged, powerful node management platform alongside an easy-to-use API. InfStones' platform is battle-tested and supports over 15,000 nodes on over 60 blockchains. The infrastructure is incredibly reliable, fast, efficient, secure, and scalable - and specially designed for cross-chain DeFi, NFT, GameFi, and decentralized application development. Developers use the AI-based platform to easily connect and work with more than 50 leading blockchain protocols, pushing the boundaries of what it means to lead with a vision and passion for global innovation. InfStones is trusted by the biggest blockchain companies in the world including Binance, Coinlist, BitGo, OKX, and more.

Infura offers top-tier infrastructure designed to help your decentralized application grow in response to user demand. With our instant access APIs, you can swiftly connect your application. We facilitate JSON-RPC over both HTTPS and WebSocket interfaces, allowing for both request and subscription-based connections. You can initiate your journey with Infura using just one URL. Our dedicated team of experts is available around the clock to manage all network modifications and upgrades, enabling you to concentrate on developing your applications. We are committed to a future driven by decentralized networks and protocols. Our infrastructure supports developers, allowing you to invest your time in innovation and creation. Through our Infura dashboard, you can discover valuable insights, add applications, and more. If you require assistance or have inquiries, our vibrant community, current status page, and comprehensive documentation library are always available to help you. Additionally, we pride ourselves on maintaining a user-friendly environment that encourages exploration and experimentation.

You can create blockchain and digital asset solutions without having to start from scratch. Start small and quickly move to production. You can choose from popular cloud properties, hybrid deployment options, geographical regions, protocols, consensus mechanism, and many other options all at the touch of a button. It makes blockchain an easy-to-use endpoint that allows you to accelerate the development and deployment your d'Apps. An intuitive interface that allows you to manage all aspects of your blockchain networks and environments. Automated tools and workflows make it easy to scale your business network and onboard new members. Each member is responsible for managing their own key materials, data, and nodes. You can easily scale your network using single proxy operator or distributed network ownership. Manage your networks, memberships, users, and environments.

A single line of code can elevate your development experience using the most robust blockchain developer platform, which is trusted by 70% of the leading Ethereum applications worldwide. Alchemy Supernode stands as the most utilized Ethereum API available. It offers all the features of a traditional node, including JSON-RPC support, while providing enhanced reliability, data accuracy, and scalability essential for deploying top-tier blockchain applications. Alchemy Build consists of a no-configuration, in-house set of developer tools that allow for faster prototyping, debugging, and product delivery. You can swiftly search through millions of past requests, monitor real-time transactions in the mempool, execute JSON-RPC calls directly from the dashboard, and easily review recent requests and any errors. Furthermore, Alchemy Monitor presents an extensive range of dashboards and alerts focused on app health, performance metrics, and user engagement. You can quickly assess the status of all your applications from a single interface, gather user insights without breaching privacy, and receive automated notifications for any critical issues. This comprehensive suite empowers developers to streamline their workflow and enhance their application's overall performance.

NOWNodes offers a comprehensive Blockchain-as-a-Service platform that enables users to access Full Nodes and Explorers through an API, supporting over 50 different blockchain networks. You can select the node that best suits your requirements and utilize the available methods to establish a connection. Focus on developing wallets, exchanges, decentralized applications, and more, while we handle the underlying infrastructure. Our service boasts a robust framework that is efficient, affordable, and dependable. We maintain Service Quality Standards for all our partners to ensure excellence. Additionally, your nodes are monitored around the clock, with their performance and relevance consistently assessed. This ensures our clients benefit from scalability for extensive projects and receive rapid API responses, allowing for seamless development. With NOWNodes, you can innovate without the burden of backend management.

Enterprise clients can utilize a blockchain-driven data registry along with a verifiable credential framework to ensure that both data and processes can be independently validated. By leveraging blockchain technology, organizations can generate entries that confirm data existed in a specified state at a particular moment in time. Consequently, anyone authorized to access this data can cross-reference it with the blockchain version for verification. Amendments to the data will be easily noticeable and can be promptly identified by any system equipped with Connect functionality. The Factom blockchain offers an unchangeable record by securely publishing timestamped documentation of your data and files, thus helping to avert expensive disputes. This evidence is stored permanently on the Factom blockchain, ensuring it is available for review whenever validation is required. The Factom blockchain serves as a robust public witness, as the entries are validated by an expanding network of computers operating the protocol, making the credibility of their proofs undeniable. This feature enhances confidence in the integrity of the data, fostering trust among all stakeholders involved.

WatchData offers easy and dependable API access to the Ethereum blockchain. Some of the key benefits of using WatchData include its consistent data reliability, seamless connectivity without interruptions, and the ability to automate processes efficiently. Additionally, it supports high usage limits to accommodate all users and provides compatibility with multiple nodes. Resource scaling is also available, along with impressive processing speeds that enhance the overall user experience. These features make WatchData an attractive choice for those needing robust blockchain solutions.

Vezgo offers one API to integrate with every Digital Asset. Whether you want to get access to data on Centralized Exchanges, Decentralized Wallets, NFTs or the Blockchain, Vezgo's API will provide a simple integration to allow your users to connect all their Web3 accounts. Vezgo bridges Web2 data into your Web2 use case. It's a simple API that will consolidate and aggregate your user's full balances, positions and transactions in a normalized and standardized data set you can use in your existing Web2 applications.

Our REST API is designed to accommodate real-time applications while efficiently managing extensive parallel processing, making tasks such as fetching NFT sales data, ERC20 token balances, and DEX swaps remarkably straightforward. With our SDK, you can seamlessly access this information directly within your production environment using just a few lines of code. You can quickly develop more intricate queries and transformations, allowing for complete flexibility in data ingestion. The ability to join multiple tables empowers you to tackle more sophisticated use cases, such as calculating PnL leaderboards based on NFT sales data, determining smart floor prices for various collections, or assessing the USD-equivalent balance of a wallet's ERC20 assets at any historical moment. Furthermore, our serverless snippets can easily connect with external data sources and execute transformations that may not be feasible through standard SQL queries. Accessing Transpose directly from your frontend enables you to enhance production UIs effectively. With real-time capabilities and ultra-low latency queries, you can deliver the critical data your customers need as swiftly as possible, ensuring they have the most up-to-date information at their fingertips. This powerful combination of features positions your applications to meet the demands of modern users with unparalleled efficiency.

BlockSpan serves as an NFT API platform tailored for software companies engaged in blockchain development. By consolidating information from various blockchain networks, we offer a streamlined API that enables NFT developers to access real-time data such as token prices, ownership status, and metadata, including pre-cached images. Transitioning between multiple blockchains or utilizing different chains doesn't have to be a cumbersome process; instead of laboriously scraping block logs, you can effortlessly implement a straightforward REST API integration. Our API provides more than just transactional information; it also delivers details on pricing, current ownership, and extensive metadata. Currently, our platform supports Ethereum, Polygon, Arbitrum, and Optimism, with additional blockchain integrations on the horizon. We have also created comprehensive documentation for every endpoint, which features an interactive API console to enhance usability. Moreover, our NFT API is designed to include token metadata and cached image URLs, effectively reducing the need for multiple API and IPFS calls to gather that information. With such functionality, developers can focus on building innovative applications without the hassle of backend complexities.

Launch your NFT application in just hours rather than taking several months. We handle all the complexities of the NFT infrastructure, allowing you to concentrate on enhancing your application. Designed specifically for developers by those who understand their needs. Mastering technologies like Solidity, Web3.js, GraphQL, nodes, and IPFS can be challenging, labor-intensive, and often requires a diverse skill set within a team. Many teams find themselves wasting between 25-50% of their engineering efforts on managing nodes and creating indexers, which merely duplicates existing solutions. Relying on slow, heavily rate-limited, and incomplete APIs can impede your progress in a highly competitive landscape, risking both user retention and revenue generation. By streamlining these processes, we empower you to focus on innovation and growth.

OnFinality is a platform for blockchain infrastructure that saves web3 builders their time and makes their lives simpler. OnFinality provides API endpoints that are scalable for the largest blockchain networks. It empowers developers to automate testing, deployment, scaling, and monitoring their own blockchain nodes within minutes. OnFinality has processed over 300 billion RPC requests to date across 70 networks, including Polkadot and Ethereum, Moonbeam and Astar. It is constantly expanding these mission-critical services to developers so they can build the decentralised future faster! OnFinality helps you to be smarter.

Addressing reliability and performance challenges in Web3 involves the strategic utilization of numerous third-party node providers alongside an advanced decentralized blockchain API platform, while enhancing the overall user experience. Initiate your journey on the most pertinent blockchain projects within the Web3 ecosystem. With a commitment to delivering one of the industry's most robust decentralized infrastructure services and achieving rapid response times, Blast leverages clustering techniques and the geographical distribution of third-party nodes to efficiently meet the infrastructure demands of Web3 developers, enabling them to concentrate entirely on application development. Scaling is seamlessly achieved by integrating additional node providers into our network. Furthermore, our protocol ensures good node conduct through regular evaluations and implements corrective actions for underperforming nodes, such as slashing staked tokens or removing them from the network, thus maintaining high standards within the ecosystem. This rigorous approach not only promotes reliability but also fosters a healthier environment for developers to thrive.

The Evercloud platform offers developers a suite of products, APIs, and tools tailored for creating, testing, and deploying applications on TVM-compatible networks such as Everscale, The Open Network (TON), Venom, and Gosh. It features comprehensive and highly available APIs specifically designed for TVM blockchains, catering to businesses of all sizes that prefer not to handle their own infrastructure. Enterprises and resource-intensive decentralized applications (DApps) can benefit from optimal API performance, alongside the flexibility to enhance the system with custom APIs. Evercloud also serves those interested in operating their own node with basic API access. Additionally, it is an ideal choice for DApp and contract developers, as well as testers aiming to conduct local tests prior to deploying on actual networks. A robust GraphQL API, which is consistently utilized across all products, ensures a seamless development experience from local testing phases through to staging and production environments. Evercloud provides developers working within TVM networks with scalable GraphQL API endpoints, allowing for efficient project creation and blockchain communication, ultimately simplifying the development process. This platform empowers users to innovate effortlessly while maintaining control over their development workflow.

We are a data company specializing in an API-first approach for cryptoassets, focusing on delivering high-quality market data APIs tailored for institutional investors and exchanges in the cryptocurrency space. Our suite of products and services enables funds, fintech applications, and exchanges to obtain pristine, normalized, and uninterrupted primary source trade and order book data. Our mission is to expand the decentralized financial ecosystem by making it more accessible and comprehensible for data-driven investors. We aim to index 95% of the available trade, order book, and on-chain transaction data for tokenized assets, which encompasses security tokens, tokenized funds, indexes, derivatives, real estate investment trusts (REITs), and of course, cryptocurrencies. Our communication style is concise and clear, ensuring that our objectives are well understood. We prioritize active listening and strive to comprehend fully before responding, maintaining a composed demeanor even in challenging situations, which helps us achieve clearer insights. Additionally, we are committed to providing honest feedback to our colleagues, fostering an environment of openness and proactive information sharing. This approach not only enhances collaboration but also strengthens our overall team dynamics.

Coinpath® is a comprehensive suite of APIs designed for tracing blockchain transactions, utilizing advanced mathematical algorithms to analyze the movement of funds between various blockchain addresses. By employing heuristics and machine learning techniques, Coinpath® effectively identifies clusters, monitors transaction flows, and assesses account balances. These APIs serve as a crucial component for a variety of blockchain investigation and compliance applications. With Coinpath®, users can trace monetary movement for any given source and destination, construct visual representations of money flow, and consolidate transfers to specific addresses. The tool allows for the identification of the source and endpoint of transactions, as well as insights into transaction amounts and pathways. Additionally, Coinpath® generates a visually coherent data graph that illustrates the flow of funds by examining wallet transactions and associated addresses, clearly mapping the journey of money from its origin to various cryptocurrency services and Virtual Asset Service Providers (VASPs). This cutting-edge blockchain forensic technology plays an essential role in overseeing customer deposits and withdrawals, particularly in identifying "tainted" coins linked to illicit activities such as money laundering and financing terrorism, thereby enhancing overall financial security. In summary, Coinpath® not only aids in compliance efforts but also strengthens the integrity of blockchain transactions.