SQD (formerly Subsquid) is an open-source blockchain data indexing platform. See features, pricing, and use cases for developers building on-chain apps.
Category
API Tools
Pricing
open-source, from Free (open-source SDK; Cloud usage-based pricing)
Verified
Not yet
Last updated
July 19, 2026
Founded
2021
Headquarters
Zug, Switzerland
EnterpriseAPIOpen Source
What Is SQD
SQD is an open-source, decentralized onchain data platform, formerly branded as Subsquid, that gives developers a single API for accessing validated blockchain data from over 225 networks.
Founded in 2021 in Zug, Switzerland, SQD was built to solve the reliability and cost problems of raw blockchain RPC access by validating every block through cryptographic checks and replicating data across a distributed network of worker nodes before serving it through a streaming HTTP API.
Key Features
Developers query historical and real-time data from genesis to the current block head through the same API, with support for both EVM chains and Solana, and can self-host the network components since the core SDKs are open source.
The platform validates each block using multiple cryptographic checks and cross-references multiple data sources, and provides worker-signed responses with verifiable audit trails, which is why it is used by DeFi, gaming, and compliance-focused applications that require high data correctness.
Pricing
The core Squid SDK, Pipes SDK, and CLI are free and open source, and SQD Network data retrieval itself is free of charge since the network is designed to make raw blockchain data widely accessible.
SQD Cloud offers a free playground for deploying a single indexer at no cost, while production deployments are billed pay-as-you-go based on the compute and database storage resources consumed, with enterprise plans adding a 99.9 percent uptime SLA.
Key Features
Unified Streaming Data API — Access historical and real-time blockchain data from genesis to the latest block through one consistent HTTP API across 225-plus networks.
Cryptographic Data Validation — Every block passes multiple cryptographic checks and cross-source verification before being served, targeting 100 percent data correctness.
Decentralized Worker Network — Data is replicated across thousands of worker nodes that sign their responses, creating a verifiable audit trail.
Open-Source SDKs — The Squid SDK and Pipes SDK are Apache 2.0 licensed, letting developers build and self-host custom indexing pipelines.
Multi-Chain and Solana Support — A single API surface covers EVM-compatible chains as well as Solana, simplifying multi-chain application development.
Free Playground Environment — Every account gets a free playground organization to develop and deploy one squid indexer at no cost.
Low-Latency Delivery — Reports median response times around 27 milliseconds and sub-50 millisecond P90 latency under load.
Enterprise SLA and Self-Hosting — Enterprise customers get a 99.9 percent uptime SLA, and the AGPL-3.0 licensed network components can be self-hosted for full control.
Pros & Cons
Pros
Core SDKs and data access are free and open source
Very low latency and high data correctness for on-chain queries
Single API covers 225-plus networks instead of separate integrations
Self-hosting option available for teams wanting full control
Used in production by well-known DeFi protocols managing billions in TVL
Cons
Cloud pricing is usage-based and less predictable than flat subscription tools
Recent acquisition by Rezolve Ai introduces uncertainty about product direction
Primarily targeted at Web3 and blockchain developers, not a general-purpose tool
Requires technical setup and indexing knowledge to get full value
Company size and support structure post-acquisition are not publicly detailed
The core SDKs and CLI are free and open source, network data retrieval is free, and SQD Cloud includes a free playground for a single indexer; production cloud usage is billed pay-as-you-go.
What was SQD previously called
SQD was previously known as Subsquid before rebranding.
How many blockchain networks does SQD support
SQD supports data access across more than 225 blockchain networks through a single API.
Is SQD open source
Yes, the Squid SDK and Pipes SDK are Apache 2.0 licensed, and the SQD Network and Portal are AGPL-3.0 licensed, allowing self-hosting.
Who owns SQD now
Subsquid Labs, the company behind SQD, was acquired by Rezolve Ai in October 2025.
What is SQD used for
SQD is used to index and query historical and real-time blockchain data for DeFi protocols, analytics platforms, gaming projects, and AI agents that need on-chain data.
Does SQD support Solana
Yes, Solana is supported through the same API used for EVM-compatible chains.
How fast is SQD's data delivery
SQD reports a median response time of around 27 milliseconds and roughly 48.5 milliseconds at the 90th percentile under load.