Blockchain Data Indexing API

Chainlens provides comprehensive blockchain data indexing infrastructure that transforms raw on-chain data into enriched, queryable formats accessible through a REST API. This OpenAPI-compliant indexing service delivers structured blockchain data far beyond what traditional blockchain node APIs provide, enabling developers to build applications without complex data processing pipelines.

Real-Time Data Indexing

The platform indexes blockchain data in real-time, providing instant access to enriched on-chain information including decoded transaction data, token metadata, NFT attributes and images, internal transaction traces, contract bytecode analysis, and account-based asset views. The indexing system aggregates and processes blockchain data continuously, maintaining up-to-date indices of blocks, transactions, addresses, smart contracts, tokens (ERC-20), and NFTs (ERC-721/ERC-1155).

GraphQL and REST API Access

Developers can query indexed blockchain data through standards-compliant REST API endpoints. The API adheres to the EIP-3091 Block Explorer API Routes standard, ensuring compatibility with Ethereum wallets and existing tooling. The OpenAPI specification enables automatic client code generation in multiple programming languages, streamlining integration workflows.

Data Enrichment and Normalization

Unlike raw blockchain node APIs that only return primitive block and transaction data, Chainlens provides enriched and normalized data ready for application consumption. The platform decodes smart contract events, enriches token and NFT metadata, tracks account-based asset holdings, and provides comprehensive analytics on network activity. This data enrichment eliminates the need for developers to build custom indexing infrastructure.

Multi-Chain Indexing Support

The indexing infrastructure supports all EVM-compatible public blockchains including Ethereum, Polygon, Optimism, Base, Linea, Arbitrum, and ZK-rollups. It also supports private blockchain networks built on Hyperledger Besu and Quorum, making it versatile for both public and enterprise deployments.

Smart Contract Event Aggregation

The platform aggregates and indexes all smart contract events and logs, enabling developers to monitor specific contract events in real-time without polling mechanisms. This supports building reactive applications, monitoring systems, and automated workflows triggered by on-chain activity.

Asset Tracking Capabilities

The indexing system provides comprehensive tracking of on-chain assets including ERC-20 tokens, ERC-721 NFTs, and ERC-1155 multi-tokens. It maintains account-based views showing all tokens and NFTs held by specific addresses, token holder analytics, transfer histories, and collection-level NFT metadata.

Integration Use Cases

Common integration use cases include: integrating blockchain data into observability platforms like Datadog or Grafana, building real-time monitoring and alerting systems for smart contract events, creating analytics dashboards for network operators, developing portfolio tracking applications, and automating on-chain data reporting workflows.

Developer Experience

The API includes comprehensive documentation with example requests and responses, detailed endpoint descriptions, and integration guides. The standards compliance and OpenAPI specification enable rapid development and reduce integration friction.