List of OnChain Data API projects on Ethereum (2026)

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.

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.

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

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

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

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.

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.

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

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.

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.

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

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.

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.

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.

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.

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.

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.

0xAPI is a multi-chain data API providing structured real-time and historical blockchain data through REST endpoints for tokens, NFTs, transactions, blocks, wallets, and events.

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.

Krystal Cloud is an on-chain data API that indexes liquidity pool and LP position data across multiple EVM chains and DEXs. REST endpoints deliver pool metrics, APR statistics, incentive data, and position details with real-time updates. The service uses a credit-based pricing model with tiered plans, and provides CLI tooling and an embeddable UI component for developer integration.

OnChainRisk is a blockchain forensics and wallet risk scoring platform for investigators, compliance teams, and developers. It provides a dashboard and a REST API that analyze wallet activity, screen addresses for anti-money-laundering and sanctions risk, and trace stolen funds across multiple blockchain networks. The platform also evaluates token contracts for honeypot behavior and other security risks, inspects deployed smart contracts for verification status and proxy patterns, and detects block-level activity such as sandwich attacks and arbitrage. Users can generate exportable reports and query an AI assistant that summarizes fund flows and flags suspicious patterns in plain language.

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.

DeBank Cloud is an onchain data API platform that provides real-time indexed blockchain data on wallet portfolios, token balances, DeFi protocol positions, and transaction pre-execution results across multiple blockchains, priced on a compute unit model. It bundles an OpenAPI for querying chain, protocol, pool, token, user, and wallet data, DeBank Connect for authenticating decentralized applications through DeBank wallet accounts, and an Official Account service that lets Web3 projects build branded pages, broadcast updates, and communicate with users identified by their wallet addresses. The service is used by developers and Web3 teams needing indexed on-chain data or user engagement tools without building their own indexing infrastructure.

Xerberus Public API is a REST API providing programmatic access to risk scores, wallet screening, and registry data for DeFi assets and protocols. Endpoints cover unified asset risk scores across Cardano, Ethereum, and Polygon, suspicious wallet flagging, known scam wallet identification via the SIREN service, and vault-level dendrogram reports. Access is authenticated through API keys issued on request.

Glassnode Data is an on-chain data API that delivers blockchain metrics and market data through a unified interface with hundreds of endpoints. The API covers on-chain fundamentals, investor behavior, derivatives, and ETF flows, and supports delivery through a command-line tool, a data warehouse sharing integration, an Excel add-in, and a Model Context Protocol server for AI agents. Users access point-in-time data for backtesting and quantitative research with entity-adjusted metrics across a wide range of supported blockchains and assets.

GoldRush is a REST and WebSocket API suite providing indexed blockchain data across multiple networks. Endpoints cover token balances, transaction histories, decoded event logs, OHLCV price data, and real-time DEX pair streams. A command-line interface enables terminal-based querying without writing code, and an Agent Skills package delivers structured endpoint context to AI agents via the Model Context Protocol. The API is accessed via a single API key and a unified data schema across all supported chains.

Bebop API is a suite of REST APIs providing on-chain trade execution, price discovery, and trade data for application integration. The RFQ API connects to private market maker inventory and returns firm quotes with guaranteed price and fill for single and multi-token trades. The Aggregation API routes orders through competing solvers across decentralized liquidity sources for broader token coverage with configurable slippage tolerance. The Price API streams real-time prices from market participants via WebSocket. The Trade History API provides indexed trade records queryable by chain, token, and transaction type. Execution APIs settle on-chain through audited smart contracts using EIP-712 signed orders, with gasless submission available as the default mode.

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

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

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.

SimpleHash API lets you access NFT and token data across multiple blockchains through REST APIs, webhooks, and streaming services.

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.

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.

Amp is a blockchain data platform that indexes smart contract events in real time, reconciles chain reorganizations, and exposes results as structured SQL tables via SQL, REST, and GraphQL interfaces. The system preserves cryptographic provenance for every dataset, providing audit-grade lineage from transaction origin to settlement. Deployable on-premises, in hybrid, or cloud environments, it serves regulated banks, stablecoin issuers, and enterprise teams managing compliance obligations including GENIUS Act requirements, AML monitoring, and SAR filing procedures.

Mirador is a blockchain observability platform that traces transactions across applications, wallets, and chains into a single unified record. It correlates frontend activity, wallet and signer context, and on-chain execution data, including cross-chain bridge activity and multisig events, so engineering and operations teams can debug failed transactions and reconstruct full user journeys. The platform adds real-time monitoring, service-level agreement tracking, and automation rules that trigger alerts when anomalies occur, alongside shared dashboards for team-wide visibility. Developers integrate the platform through software development kits for web and server applications.

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.

BlockRazor is a Web3 transaction infrastructure platform for wallets, decentralized exchanges, trading bots, searchers, and quantitative trading systems. It provides transaction submission services including private RPC routing, block building, and gas sponsorship, alongside low-latency real-time data streams covering pending transactions, blocks, node synchronization, and network fee data. The platform routes transactions through private paths to reduce exposure to sandwich and frontrunning attacks while sharing a portion of backrun value with users as rebates, and it delivers early transaction and block signals to support latency-sensitive trading strategies. Users access all services through a unified account and dashboard covering multiple blockchain networks.

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