Moralis

Moralis is a web3 data API platform providing structured blockchain data without requiring teams to run their own indexing infrastructure. Its NFT API, DeFi API, token price feeds, and wallet portfolio queries cover the data needs of most web3 application features — agents building NFT galleries, DeFi dashboards, or wallet portfolio tools can retrieve structured data without implementing chain indexing. The Streams API adds real-time blockchain event monitoring through webhooks.

Authentication uses API keys for REST API access. Moralis API keys are project-specific and control access to all Moralis data products. Teams should use separate keys for development and production environments and monitor usage against plan limits.

Documentation is comprehensive and covers all API endpoints clearly. The Streams API documentation — explaining filter configuration and webhook delivery patterns — is particularly important for teams building event-driven web3 agents. Teams evaluating Moralis versus Alchemy's enhanced APIs or Covalent for structured blockchain data should compare endpoint coverage for their specific chains and data types.

The API covers wallet portfolio (token balances, NFT holdings), NFT data (metadata, ownership, transfers, floor prices), DeFi protocol data (DEX prices, liquidity positions), token prices, and transaction history. The Streams API enables agents to subscribe to wallet activity, contract events, and token transfers with webhook delivery. This structured data layer is what distinguishes Moralis from raw node providers — agents get application-ready data rather than raw RPC responses.

Reliability is appropriate for a web3 data service. Blockchain data APIs have inherent dependencies on underlying chain state and indexing infrastructure. Teams building production web3 features on Moralis should implement fallback strategies for data unavailability, as blockchain data services have historically had reliability challenges during high-activity periods.