Covalent

Covalent provides the unified API for granular, multi-chain data: indexing 40+ blockchains (Ethereum, Polygon, Avalanche) to power verifiable data for AI and decentralized applications.

Covalent is the modular infrastructure for verifiable data, crucial for building autonomous AI agents and decentralized applications (dApps). We solve the Web3 data fragmentation problem by indexing the entire history of over 40 blockchain networks, including Ethereum, Polygon, and Avalanche. This full index provides granular, historical data—transactions, smart contracts, wallet balances—accessible via a single, unified API. Developers eliminate complex queries and specialized node connections, gaining immediate, standardized access for use cases like NFT marketplaces and DEXs. This efficiency drives faster development and delivers true visibility into cross-chain digital assets.

https://www.covalenthq.com