Blockchain Data APIs

Blockscout provides comprehensive blockchain data indexing infrastructure through REST, JSON-RPC, and GraphQL APIs, enabling developers to programmatically access structured on-chain data for application integration, analytics, and blockchain tooling across 3,000+ supported networks.

API Offerings

The REST API delivers extensive endpoints covering blocks, transactions, addresses, tokens, contracts, and logs with flexible query parameters, pagination support, and response filtering. Endpoints support detailed blockchain data retrieval including transaction traces, internal transactions, token transfers, and contract event logs.

JSON-RPC API provides Ethereum-compatible RPC methods enabling standard Web3 library integration. Developers can use popular libraries like ethers.js and web3.js with Blockscout RPC endpoints as data sources, facilitating rapid application development with familiar tooling.

GraphQL API offers flexible query construction allowing clients to request exactly the data needed, reducing over-fetching and improving application performance. The GraphQL playground provides interactive documentation and query testing directly through the web interface.

Indexing Infrastructure

Blockscout's indexing engine transforms raw blockchain data into structured, queryable formats optimized for application developers. The platform continuously indexes blocks, transactions, internal transactions, contract events, token transfers, and state changes across supported networks.

The modular architecture built with Rust-designed microservices enables extensibility and performance optimization. Optimized database indexing, caching layers for frequently accessed data, and CDN distribution provide global low-latency access.

Advanced Data Access

APIs expose advanced blockchain data including decoded contract calls showing method names and parameters, contract ABI storage and retrieval for verified contracts, token holder analytics and distribution metrics, and historical state queries for time-series analysis.

Internal transaction tracking reveals value transfers occurring within smart contract execution, critical for DeFi analytics and transaction flow analysis. Log decoding translates raw contract events into structured data using verified contract ABIs.

Developer Tools and Documentation

Comprehensive API documentation covers all endpoints, parameters, response formats, and example requests. Interactive documentation allows developers to test API calls directly from the docs, seeing real responses from production explorers.

Rate limiting and authentication options support both public API access for open-source projects and authenticated access for commercial applications requiring higher rate limits. Enterprise API access provides dedicated infrastructure with SLA guarantees.

Use Cases

Wallet applications integrate APIs for transaction history, token balances, and address monitoring. DeFi protocols use APIs for price feeds, liquidity tracking, and on-chain event monitoring. Analytics platforms leverage APIs for blockchain metrics, address clustering, and transaction flow analysis. Developers building blockchain tools, monitoring systems, or data aggregation platforms benefit from Blockscout's comprehensive data coverage across the entire EVM ecosystem, enabling multi-chain application development from a single API provider.