List of OnChain Data API projects on Bitcoin (2026)

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.