List of OnChain Data API companies in Web3 (2026)

Clio is an API server optimized for validated XRP Ledger data access through WebSocket and HTTP interfaces. The system stores ledger data in space-efficient format using Cassandra, enabling horizontal scaling and reduced load on core rippled servers.

OKX Onchain OS is a developer platform providing an agentic wallet and a wallet API for building AI agents, trading bots, and Web3 applications. The agentic wallet generates and stores private keys within a trusted execution environment, screening transactions against risky addresses before signing, while supporting multiple sub-wallets per account across several blockchains. The wallet API exposes balance queries, transaction broadcasting, and transaction history so external applications can query and act on-chain through one interface.

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

Turbo Pipelines is a real-time blockchain data streaming service that ingests raw on-chain data from 150+ chains including Solana and routes it through configurable SQL, TypeScript, and HTTP transforms to destinations such as PostgreSQL, ClickHouse, Kafka, and webhooks. Built on a Rust engine with vectorized execution, it provides sub-second latency, instant deployment, live data previews, dynamic address filtering, and unlimited historical replay.

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.

Wormhole Queries is an on-chain data API that lets applications pull real-time data from multiple blockchains on demand. It retrieves state such as balances or contract data directly from supported networks and returns it through Guardian-signed attestations for verification. Developers use it for multichain analytics, reporting, and data aggregation without operating their own indexing infrastructure.

Subgraphs are open APIs that define how blockchain data is indexed and queried using GraphQL. They allow developers to create custom data schemas for smart contract events and make blockchain data easily accessible to applications.

Substreams enables high-performance data streams for real-time blockchain processing through modular components. The system processes blockchain data in parallel while maintaining composability for custom data pipelines.

Firehose is a blockchain data extraction layer that processes full blockchain histories. It provides a files-based and streaming-first approach to blockchain data, serving as the foundation for Substreams.

Amp is a blockchain-native database that transforms raw onchain data from multiple chains into verifiable, structured datasets with real-time access. The system provides SQL, REST, and GraphQL query interfaces for enterprise analytics, compliance reporting, and AI-driven applications. Amp features SOC 2-aligned architecture with full data lineage, flexible deployment options, and cross-chain unification capabilities.

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.

Amberdata Enterprise Data is a normalized digital asset data infrastructure delivered via REST APIs, WebSocket feeds, and cloud integrations including Snowflake, Databricks, and AWS S3. The platform aggregates market data from centralized exchanges, DeFi protocol metrics, wallet and on-chain activity, IOSCO-compliant reference rates, and post-trade tools for risk management, regulatory compliance, and liquidity analytics.

Cosmostation Data Provider is an onchain data API and RPC infrastructure service that gives third parties structured access to indexed blockchain data. It offers an LCD proxy, utility, statistics, historical, transaction builder, and custom data APIs, alongside high-throughput RPC endpoints, letting developers query balances, chain parameters, and historical records without operating their own nodes. The service targets developers and institutions building applications across multiple proof-of-stake networks.

QuickNode Streams is a service that pushes blockchain data directly to users as it becomes available. It eliminates the need for users to handle errors, retries, rate limits, and bottlenecks

Ekubo Indexer is an open-source data indexing service that parses onchain events from Ekubo deployments into structured, queryable data. Developers, analytics providers, and aggregators use it to retrieve pool, position, and trade data without running their own indexing infrastructure. The service underpins shared tooling such as risk engines and analytics dashboards that integrate with the protocol once rather than per deployment.

Dwellir Hyperliquid Data API provides real-time and historical market data for the Hyperliquid exchange via edge servers in Singapore and Tokyo. The service delivers L2 orderbook depth up to 100 price levels, L4 individual order visibility including user addresses, gRPC streaming for block and fill event data, and OHLCV candlestick data accessible through REST, WebSocket, and JSON-RPC endpoints.

thirdweb Insight provides blockchain data queries and analytics through APIs that enable developers to access onchain information and power AI agents with blockchain data.

Staking Data API provides near real-time blockchain data aggregation across proof-of-stake networks through unified query interfaces. The service indexes historical staking metrics, validator performance statistics, reward distributions, and network parameters. API architecture delivers SOC 2-certified data reliability with industry-leading service level agreements for production environments.

gRPC Data Streaming is an onchain data API that provides structured, real-time Solana blockchain data through the Yellowstone Geyser plugin for applications requiring low-latency, event-driven data consumption.

Gateway Indexer is a blockchain data indexing service that parses and structures on-chain event data for application use. It supports any EVM-compatible event type and scales to high request volumes, enabling rapid integration for teams needing dashboards or custom DeFi calculations. The service provides privacy controls so indexed data remains visible only to authorized owners.

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

NFTScan API delivers comprehensive NFT data services through REST APIs, enabling developers to access ERC-721 and ERC-1155 asset information, transaction records, collection statistics, and marketplace data across multiple blockchain networks.

Codex API provides GraphQL access to blockchain data across multiple networks, indexing transactions, token metadata, and exchange activity for millions of tokens. The system offers real-time and historical data through free and paid tiers for integration into applications.

Guardarian API is a developer integration tool that lets businesses embed fiat-to-crypto exchange functionality directly into their own applications. It exposes endpoints for real-time exchange rate estimation, transaction creation, and status tracking, allowing partners to build a complete conversion flow. Documentation covers the full exchange process including multiple payment methods.

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

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.

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.

Etherscan API V2 provides indexed on-chain data across multiple EVM-compatible networks through unified REST endpoints accessible via a single API key and chain ID parameter. The service exposes account balances, transaction history, smart contract ABIs and source code, token transfer events, gas oracle data, event logs, and address name tags. Tiered subscription plans offer varying rate limits and access to Pro endpoints covering address metadata, token holder analytics, and cross-chain portfolio data.

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

All-in-one web3 data infrastructure for indexing, transforming, and utilizing large-scale on-chain data through APIs, datasets, data cloud, and data syncing services.

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.

CoinMarketCap API is an onchain data API providing programmatic access to cryptocurrency pricing, volume, exchange, and DEX data through REST endpoints and a WebSocket feed. It parses and structures market and blockchain data for developers building wallets, exchanges, portfolio trackers, analytics platforms, and AI products. The service offers tiered plans from a free keyless trial to enterprise access, and supports agent-oriented access methods alongside traditional API keys.

Quppy API is a business-facing integration service that lets companies embed multi-currency wallet generation, virtual IBAN creation, and cryptocurrency exchange functionality into their own applications. It provisions custodial crypto wallets and virtual IBANs for each end client, enabling buy and sell flows between fiat and digital assets. The product includes built-in KYC and AML compliance checks so integrating businesses can offer crypto-fiat exchange without building compliance infrastructure themselves.

Real-time pricing data for blockchain assets and decentralized finance (DeFi) applications.

A suite of developer APIs for accessing Bitcoin blockchain data and market information. Includes REST JSON endpoints for querying blocks, transactions, addresses, and balances (Blockchain Data API); a plaintext interface for real-time Bitcoin network metrics such as hashrate, difficulty, and block height (Simple Query API); a WebSocket channel at wss://ws.blockchain.info/inv for real-time transaction and block notifications; BTC/fiat exchange rate data across multiple currencies (Exchange Rates API); and historical chart and statistics data for network-level metrics (Charts & Statistics API).

Token Terminal API enables developers to access standardized blockchain data programmatically through REST endpoints, supporting integration into applications and analysis workflows.

Cielo API is an onchain data API that gives developers programmatic access to wallet and transaction data across multiple blockchain networks. It provides endpoints for retrieving transaction feeds, wallet tags, and token or wallet profit and loss calculations, with filtering options for bot and spam activity. Developers use the API to build applications that incorporate wallet analytics and real-time onchain activity.

Console provides developers with API access to multi-chain blockchain data through authentication keys and subscription management. The platform enables real-time data queries across supported networks.

Crypto Trading API Platform is a trading infrastructure product that lets banks, brokerages, and fintechs offer digital asset trading to their own customers. It provides API access to liquidity sourcing, market data, and execution through request-for-quote and order book models, with settlement handled on the back end. Businesses embed the API into their own applications rather than building exchange connectivity and custody logic themselves.

SonarX Real-Time is a blockchain data service providing indexed on-chain data with seconds from tip latency across multiplechains. The product offers instant indexing and delivers data through warehouses for SQL querying without storage costs. Used for trading models, fraud detection, network monitoring, risk assessment, and DApp analytics.

Nimbus On-Chain Data API is a REST API delivering real-time indexed blockchain data across multiple networks, including token holdings, NFTs, DeFi positions, and price data. It bundles a DEFI Actions module that prepares and returns transaction payloads for third-party protocols and a Kafka-based Sui price feed for streaming updates. Access is managed through an API Portal with Free, Premium, and Enterprise tiers, with some endpoints requiring an API key.

Blockstream Explorer API is a developer service providing indexed data from the Bitcoin and Liquid Network blockchains. It exposes transaction, address, and block information through structured endpoints for application integration. Developers use it to query onchain data without operating their own blockchain infrastructure.

Full block streaming service for blockchain data, supporting multiple chains and integration with indexer stacks.

Parallel processing engine for transforming blockchain data streams into application-specific formats.

SQD Network operates as a decentralized query engine optimized for batch extraction of large volumes of blockchain data from multiple networks. The system provides multiple access methods including Squid SDK for self-hosted development, SQD Cloud for hosted services, SQD Firehose for subgraph compatibility, and framework integrations. Users can extract, transform, and serve blockchain data at up to 100x faster speeds compared to traditional RPC methods.

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

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.

Soroban Indexer is an on-chain data API providing GraphQL and JSON-RPC access to smart contract data on Stellar's Soroban smart contract platform. It indexes transactions, events, ledger entries, and token contract activity into structured, queryable formats. Developers use it to build applications without maintaining their own node infrastructure or database, and it includes a companion web portal for data inspection.

CabalSpy API is an onchain data API that delivers labeled wallet intelligence covering KOL, whale, smart money, and insider wallets. It provides REST endpoints and WebSocket streams so developers can query historical wallet activity or subscribe to enriched events as they occur onchain. Trading terminals, alpha bots, analytics dashboards, and copy-trading tools use the feeds to surface wallet-level signals such as transaction history, PnL, and holding percentages. Access is tiered by monthly credit allowances and request rate limits, from a free tier through enterprise plans with dedicated infrastructure.

Zapper API offers developers GraphQL access to comprehensive blockchain data including portfolio balances, token prices, NFT metadata, and transaction histories across 50+ blockchain networks with enterprise-grade infrastructure.

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.

API for integrating RugCheck's Solana token security analysis into third-party applications and services.

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.

Helius' data streaming service delivers real-time updates on Solana blockchain events, enabling instant access to transaction and account changes for improved application responsiveness.

TRES Financial Data Lake provides enterprise-grade data infrastructure that aggregates and normalizes financial data points from 200+ Web3 networks, exchanges, and custodians, enabling developers to power their digital asset products with curated, contextual blockchain data.