List of OnChain Data API companies in Web3 (2026)

Standardized blockchain API service with RPC/WSS/REST endpoints for multiple networks.

API Suite is a unified API platform that provides access to multiple blockchain networks through standardized REST endpoints. It enables developers to query wallet balances, retrieve block-level data, monitor real-time blockchain activity, create and broadcast transactions, conduct balance audits, access pricing history, track validator rewards, and calculate transaction fees across supported protocols.

DeFiLlama API provides programmatic access to DeFi analytics data including TVL, yields, and protocol metrics. The system offers JSON endpoints for developers building applications.

HyperSync is a blockchain data streaming API for fast historical retrieval and backfilling. It provides efficient access to logs and blocks and integrates with SDKs for multiple languages.

Gateway Indexer is a blockchain data service that provides access to on-chain information for EVM events, supporting up to 100,000 requests per second with custom middleware for DeFi calculations.

NFTScan as a Service delivers infrastructure development services for blockchain developers, providing professional NFTScan infrastructure including explorers and NFT data services.

Guardarian API enables businesses to integrate fiat-to-crypto exchange functionality into their applications through RESTful endpoints. The system provides real-time exchange rates, transaction creation, and status tracking with robust documentation for developer integration.

API service that provides systematic access to Kaito's proprietary datasets, enabling integration of data feeds and metrics for investment, research, and analysis.

DappRadar API provides programmatic access to blockchain application data and analytics through standardized endpoints, enabling developers and researchers to integrate dapp metrics, NFT data, and on-chain activity tracking into external applications and research workflows.

Implements decentralized data indexing through GraphQL APIs, enabling efficient blockchain data queries. The system provides hosted subgraph services with enhanced performance and reliability.

Blockscout APIs provide REST and JSON-RPC endpoints for programmatic blockchain data access including transaction queries, address monitoring, token information retrieval, smart contract interaction, and historical data analysis. The API infrastructure supports rate-limited public access and unlimited enterprise tiers with comprehensive documentation for integration into external applications and services.

OpenSea Stream API enables real-time access to marketplace events through WebSocket connections, allowing applications to receive instant updates on listings, sales, and transfers.

A decentralized omnichain data network featuring a dual-chain architecture that bridges programmability and composability of crypto data with high throughput, low latency, and enhanced security.

CDP Onchain Data API provides enterprise-grade developer tools for reading and interacting with blockchain data, including real-time balance queries, transaction history, and smart contract events.

REST API delivering real-time blockchain data for Sui, Solana, Eclipse and Ton.

Soroban Indexer implements GraphQL access to Stellar smart contract data through indexed ledger state and transaction history. The system provides structured query interfaces for Soroban contract interactions and token operations on Stellar networks.

Moralis APIs provide structured access to blockchain data including NFT metadata, token prices, wallet balances, transaction history, and real-time event streaming across multiple EVM chains and Solana through REST endpoints and webhooks.

A comprehensive set of APIs for blockchain data access, including DEX trades, token transfers, NFT analytics, and cross-chain data through a unified GraphQL interface.

Network Data Pro provides aggregate network data metrics for cryptoassets through API endpoints and visualization tools. The system delivers on-chain metrics including active addresses, transaction counts, mining data, and economic indicators for fundamental analysis. Includes Community Data Downloads for free researcher access and Pro Charts visualization tools for interactive analysis.

Aperture API is an infrastructure providing developers and institutions with programmatic access to Aperture's intent-based DeFi services, liquidity management tools, and solver network functionality.

Artemis API implements RESTful endpoints for programmatic access to blockchain metrics. The system facilitates custom integrations with crypto data while maintaining standardized responses for cross-chain data points.

Octav API delivers portfolio and transaction data through standardized endpoints, enabling developers to access cross-chain wallet balances and enriched transaction metadata. The system provides real-time blockchain data aggregation with automated protocol categorization for integration into financial applications.

Ormi provides unified Web3 data infrastructure through multiple access methods including real-time subgraphs via GraphQL, SQL-based analytics, and REST APIs. The platform delivers sub-30ms latency blockchain indexing with 99.9% uptime across multiple chains, supporting live data streaming and historical analytics.

Aura Network solves data delays in Solana apps by running a decentralized indexing system. It distributes asset data across nodes, supporting fast queries and consistent state tracking. Developers can fetch NFT details instantly, users can validate assets reliably, and apps can scale without bottlenecks. Its multi-node architecture ensures high availability and precision for blockchain data.

Translate API processes blockchain transactions and provides standardized, human-readable data, including transaction type, description, and detailed asset transfers with comprehensive metadata.

Helius APIs is a suite of REST APIs for Solana developers. It includes the Digital Asset Standard (DAS) API for token and NFT metadata, Enhanced Transactions API for human-readable transaction parsing, Priority Fee API for fee estimation, ZK Compression endpoints, and the Wallet API for aggregated wallet data including balances, history, transfers, and identity lookups.

InfStones Fast API is a direct validator connectivity with optimized routing infrastructure, providing lightning-fast blockchain data access across 80+ protocols. The system delivers real-time transaction processing while maintaining enterprise-grade security and authentication.

LunarCrush API delivers social media analytics and market data through RESTful endpoints, enabling developers to integrate social intelligence into trading models, bots, and applications.

CoinMarketCap API provides programmatic access to cryptocurrency pricing data, volume metrics, and market capitalization through RESTful endpoints. The system processes billions of monthly API calls while maintaining low latency and high reliability for enterprise and individual developers.

Buda API delivers REST and WebSocket interfaces for programmatic trading and market data access, enabling order management and real-time price feeds. The system supports authentication via HMAC signatures while providing public and private endpoint access.

Sandwiched.me is an onchain data API that provides transparency into sandwich attacks, atomic arbitrage, and other MEV activity on Solana.

Nite Protocol is a decentralized on-chain database and open API that standardizes vacation-rental listing data, enabling trustless distribution and access for builders.

Cido Quantum-Optimized Data Indexing implements blockchain data indexing through quantum annealing combined with classical pipelines, enabling real-time data access and complex optimization. The system processes on-chain and off-chain data across EVM-compatible networks through GraphQL APIs while reducing computational overhead via QUBO-based quantum processing for data partitioning, graph optimization, and algorithmic trading workflows.

Figment's Staking API abstracts network-specific operations, enabling developers to add staking functionality for various digital assets quickly and consistently.

Blockchain Analytics offers indexed blockchain data made available through BigQuery for easy analysis through SQL.

Gravity enables real-time data collection and dataset delivery through Subnet 13, providing businesses with fresh, relevant data for analysis and decision-making.

AMB Query implements standardized blockchain data access through developer-friendly APIs, providing real-time and historical data from Bitcoin and Ethereum networks. The system abstracts complex blockchain data parsing and indexing infrastructure through unified query interfaces.

An API that provides programmatic access to Arbitrage Scanner data and services for developers, enabling integration of arbitrage metrics and on-chain wallet analytics into external systems.

Flipside API provides access to blockchain data, allowing users to execute SQL queries and retrieve data in JSON and CSV formats. It offers query result caching and detailed metadata for developers and analysts. The API supports R, Python, and JS SDKs.

DYOR TON API is an on-chain data API for TON that provides extended token information, DEX pool data, historical prices, swap history, price charts, trust scores, and related analytics.

Enterprise-grade blockchain data analysis tool that queries on-chain data to help organizations compare internal crypto data with external blockchain data, reducing errors and inconsistencies.

Azura's DeFi trading platform provides users with access to decentralized finance assets and real-time market data, allowing for efficient trade management across multiple blockchain protocols.

Cielo API provides developers with programmatic access to blockchain data streams and wallet analytics through RESTful endpoints. The API offers real-time onchain data, wallet tracking capabilities, token balance queries, PnL calculations, and related wallet discovery features. Developers can integrate these data services into their own applications and platforms.

RESTful API service providing access to CryptoRank's cryptocurrency market data, including prices, trading volumes, and market metrics.

Crypto-as-a-Service provides API infrastructure for businesses to integrate cryptocurrency functionality into their platforms. The system enables KYC verification, wallet services, and transaction processing for enterprise clients through white-label solutions.

Footprint Analytics Data API provides unified RESTful endpoints delivering structured blockchain data across NFT, GameFi, and DeFi domains. The system aggregates raw blockchain transactions into queryable datasets supporting both statistical metrics and granular transaction data.

Enterprise-grade data pipelines for curated ETL processes, enabling integration of real-time and historical on-chain data for analytics and insights without managing multiple IDLs or maintaining full ledger copies.

A specialized data analytics platform built on ClickHouse technology for analyzing blockchain and cryptocurrency data at scale.

Neynar API provides REST endpoints for accessing Farcaster protocol data, enabling developers to read user profiles, casts, feeds, and social graph information through standardized interfaces.

DigNow Data Platform provides unified API access to verified crypto data through AI-powered aggregation and multi-source integration. The system includes specialized AI agents for market intelligence, project health monitoring, and regulatory compliance analysis, processing data from multiple sources with standardized formatting.