Zapper

Zapper is an enterprise-grade onchain data API designed to simplify access to comprehensive blockchain data across more than 50 chains. It aggregates portfolio balances, token prices, NFT metadata, transaction histories, and DeFi positions into a single GraphQL API, enabling developers to build rich, real-time blockchain applications without managing complex indexing infrastructure. The API supports a wide range of data types including tokens, NFTs, DeFi assets, and human-readable transaction details, with support for both externally owned accounts and smart contract wallets.

Intended for developers building DeFi dashboards, analytics platforms, portfolio trackers, and NFT marketplaces, Zapper eliminates months of backend development by providing ready-to-use, normalized data. Its multi-chain coverage includes major Layer 1 and Layer 2 blockchains such as Ethereum, Arbitrum, Optimism, Polygon, Avalanche, Solana, Bitcoin, and many others. The API also supports advanced features like cross-chain portfolio aggregation in a single call, detailed asset deltas, and enhanced filtering options.

Zapper stands out by combining extensive chain coverage with rich metadata and real-time updates, backed by a battle-tested infrastructure trusted by leading industry players since 2019. Its GraphQL interface offers flexibility and efficiency for querying complex data sets. Thousands of developers use Zapper to power portfolio management tools, NFT valuation engines, and transaction explorers. Getting started involves obtaining an API key from Zapper’s documentation portal and integrating the GraphQL endpoints into your application stack. Comprehensive docs, sandbox environments, and active community support via Discord and X (Twitter) facilitate onboarding and troubleshooting.