Node.js client for Envio's HyperSync. TypeScript-first, built on top of the Rust implementation via NAPI bindings for high-performance blockchain data access.
HyperSync is Envio's high-performance blockchain data retrieval layer. It is a purpose-built alternative to JSON-RPC endpoints, offering up to 2000x faster data access across 70+ EVM-compatible networks and Fuel.
HyperSync lets you query logs, transactions, blocks, and traces with flexible filtering and field selection, returning only the data you need.
If you need a full indexing framework on top of HyperSync with GraphQL APIs and schema management, see HyperIndex.
- TypeScript-first: Full TypeScript types and IntelliSense support
- High performance: Built on a Rust core via NAPI bindings
- Binary transport: Optimized serialization to minimize bandwidth and maximize throughput
- Flexible queries: Filter logs, transactions, blocks, and traces
- Field selection: Choose exactly which fields to return
- Preset queries: Built-in helpers for common query patterns
- Parquet export: Stream data directly to Parquet files
- Streaming: Process large datasets without loading everything into memory
- 70+ networks: Access any HyperSync-supported network
# npm
npm install @envio-dev/hypersync-client
# pnpm
pnpm add @envio-dev/hypersync-client
# yarn
yarn add @envio-dev/hypersync-clientAn API token is required to use HyperSync. Get your token here, then set it as an environment variable:
export ENVIO_API_TOKEN="your-token-here"Fetch Transfer event logs from a USDT contract on Ethereum:
import { HypersyncClient, presetQueryLogsOfEvent } from "@envio-dev/hypersync-client";
async function main() {
const client = new HypersyncClient({
url: "https://eth.hypersync.xyz",
apiToken: process.env.ENVIO_API_TOKEN!,
});
const usdtContract = "0xdAC17F958D2ee523a2206206994597C13D831ec7";
// ERC-20 Transfer event topic0
const transferTopic = "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef";
const query = presetQueryLogsOfEvent(usdtContract, transferTopic, 17_000_000, 17_000_050);
const res = await client.get(query);
console.log(`Found ${res.data.logs.length} Transfer events`);
}
main();See the examples directory for more patterns including block data, wallet transactions, Parquet export, and real-time streaming.
Change the url to connect to any supported network:
// Arbitrum
const client = new HypersyncClient({
url: "https://arbitrum.hypersync.xyz",
apiToken: process.env.ENVIO_API_TOKEN!,
});
// Base
const client = new HypersyncClient({
url: "https://base.hypersync.xyz",
apiToken: process.env.ENVIO_API_TOKEN!,
});See the full list of supported networks and URLs.
The Node.js client is a natural fit for JavaScript and TypeScript applications that need fast, direct access to blockchain data:
- Real-time event monitoring: Stream block heights and query events as they land, like this Polymarket trade tracker built with the Node.js client
- Blockchain data analytics: Scan entire chain histories in seconds, not hours
- ETL pipelines: Extract on-chain data and export to Parquet for downstream processing
- Block explorers: Power responsive interfaces with comprehensive real-time data access
- DeFi dashboards: Query protocol events, pool data, and token transfers at scale
- Cross-chain applications: Query unified data across 70+ EVM chains from a single client
- API Documentation
- HyperSync Documentation
- Query Reference
- All Client Libraries (Python, Rust, Go)
- npm Package
How does this compare to ethers.js or viem for data fetching? HyperSync retrieves data up to 2000x faster than traditional JSON-RPC. It is designed for bulk historical data access, not transaction signing or contract writes. Use HyperSync alongside ethers.js or viem for read-heavy applications.
Do I need an API token? Yes. Get one here.
Which networks are supported? 70+ EVM-compatible networks and Fuel. See the full list.
Can I export data to Parquet?
Yes. See examples/parquet-out for an example of streaming data to a Parquet file.
Does this work with Deno or Bun? The package targets Node.js via NAPI bindings. Bun is broadly compatible with Node.js native modules. Deno compatibility may vary.
How is this different from the Rust client? This client is built on top of the Rust client via NAPI bindings. It provides a TypeScript-first interface for JavaScript/Node.js developers. If you need the lowest-level access with the least overhead, use the Rust client directly.
What is the difference between HyperSync and HyperIndex? HyperSync is the raw data access layer. Use it when you need direct access to blockchain data in your own pipeline. HyperIndex is the full indexing framework built on top of HyperSync, with schema management, event handlers, and a GraphQL API.