Indexing protocols and data APIs that let you query decoded on-chain data programmatically — transaction history, token transfers, NFT metadata, and DeFi events without running full nodes.
All tools independently reviewed. Updated 2026. Affiliate links marked *.
The decentralized indexing protocol for querying blockchain data via GraphQL subgraphs
The Graph is the canonical decentralized indexing protocol for blockchain data, used by Uniswap, Aave, Compound, Balancer, and virtually every major DeFi protoc…
Web3 backend platform with pre-built NFT, token, and wallet APIs for rapid dApp development
Moralis is a Web3 backend platform that provides pre-indexed data APIs for the most common blockchain data needs — eliminating the need for developers to write …
Real-time blockchain data pipelines with subgraph hosting and Mirror streaming to any database
Goldsky is a blockchain data infrastructure company that offers two core products: managed subgraph hosting and Mirror, a real-time blockchain data streaming se…
High-performance indexing across 225+ networks with fast historical backfill
Subsquid (SQD) is a high-performance blockchain indexing framework and decentralized data network providing access to data across 225+ networks — real-time, his…
Decentralized indexer combining data, RPC, and AI across EVM and non-EVM
SubQuery is a decentralized blockchain indexing protocol that combines data indexing, RPC services, and AI applications within a single ecosystem, supported by …
Unified multi-chain data API with the broadest chain coverage
Covalent (now delivered via its GoldRush developer platform) provides a unified, multi-chain data API covering one of the broadest sets of blockchains in the in…
GraphQL blockchain data APIs with deep DEX, transfer, and analytics coverage
Bitquery is a blockchain data provider offering powerful GraphQL APIs across 40+ blockchains, with particularly strong coverage of DEX trades, token transfers, …
Open-source TypeScript framework for fast, developer-friendly EVM indexing
Ponder is an open-source, TypeScript-native backend framework for indexing EVM smart-contract data, designed as a modern, developer-friendly alternative to writ…
Blazing-fast multi-chain indexer benchmarked among the quickest available
Envio is a modern multi-chain indexing framework focused on speed and developer experience, consistently benchmarked among the fastest indexers for historical b…
Unified NFT and token data API across many chains and marketplaces
SimpleHash is a data provider specializing in unified NFT and token data across many blockchains and marketplaces, giving developers a single, normalized API fo…
Omnichain data infrastructure with SQL access and AI-ready datasets
Chainbase is an omnichain data platform providing indexed, structured on-chain data across many blockchains through APIs and SQL-style access, positioning itsel…
GraphQL APIs for identity, social, and on-chain data (Farcaster, ENS, NFTs)
Airstack is a data platform providing GraphQL APIs that unify on-chain data with web3 identity and social graphs — notably Farcaster, ENS, Lens, token holdings,…
Verifiable, decentralized data warehouse with cryptographic SQL proofs
Space and Time (SxT) is a decentralized data warehouse that indexes blockchain data and, distinctively, can prove that query results are accurate and untampered…
Real-time, reorg-aware indexing framework for custom EVM data pipelines
Flair is a real-time blockchain indexing framework focused on custom, production-grade EVM data pipelines, offering reusable indexing primitives and a managed p…
All-in-one Web3 data and node infrastructure with indexed APIs
Nodit is a Web3 infrastructure platform (from the Lambda256 team) that bundles node/RPC access with indexed data APIs, webhooks, and developer tools, aiming to …
Managed subgraph hosting and indexing infrastructure for developers
Ormi is a blockchain indexing infrastructure provider offering managed subgraph hosting and data services, positioned as a performant, developer-friendly place …
There are two ways to get decoded on-chain data. Custom indexers (The Graph, Subsquid, Ponder, Envio) let you define exactly the data and transformations you want — maximum flexibility, but you write and maintain indexing logic. Unified data APIs (Covalent, Bitquery, SimpleHash) give you ready-made decoded data through one call — fast to ship, but you get what the API exposes. If you need a bespoke data model, build an indexer; if you need standard data fast, use an API.
The practical pain point in indexing is speed — how fast an indexer can backfill years of historical data and how low its real-time latency is. Naive indexers crawl slowly through blocks, taking days. Modern frameworks like Envio (with HyperSync) and Subsquid are benchmarked among the fastest specifically on backfill and latency. If you are indexing large historical datasets, this is the metric that determines whether your project ships this week or next month.
Some indexers offer a decentralised network (The Graph, SubQuery) where independent operators serve queries, aligned with Web3 values and often token-incentivised. Others are managed services (Goldsky, Alchemy) where a company runs the infrastructure for you. Decentralised networks offer censorship-resistance and provider diversity; managed services offer simplicity and predictable support. Many frameworks let you self-host or use managed hosting, so you can start managed and decentralise later.
Beyond general smart-contract indexing, specialised providers handle specific data domains far better. SimpleHash unifies notoriously messy NFT and token data across chains and marketplaces. Airstack connects on-chain data with identity and social graphs (Farcaster, ENS). Space and Time even provides cryptographically verifiable query results. For NFT apps, social apps, or trust-minimised use cases, a specialist saves enormous effort versus building it on a general indexer.