Helius Documentation

The engine behind Solana’s best teams, traders, and tinkerers. RPCs, APIs, gRPC streaming, webhooks, and dedicated infrastructure to build and ship crypto apps, fast.

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Data Streaming & Event Listening

Data streaming overview
Choose the right way to stream on-chain data and listen for events

LaserStream gRPC
High-performance gRPC streaming with historical replay and delivery guarantees

LaserStream WebSocket
WebSocket subscriptions for accounts, transactions, and program activity

Webhooks
Real-time HTTP notifications for the addresses and events you care about

Data APIs & RPCs

Getting data
Read and query on-chain data with standard and Helius-exclusive RPC methods

getTransactionsForAddress
Full, parsed transaction history for any address in a single call

Wallet API
Balances, token holdings, and transaction history through REST endpoints

DAS API
The Digital Asset Standard API for tokens, NFTs, and compressed NFTs

Trading

Trading overview
Low-latency infrastructure for traders, market makers, and exchanges

Pre Confirmations
Sub-slot confirmation signals so you can act before the block lands

Shred Delivery
The fastest path to transaction data, streamed as raw or preprocessed shreds

Sender
Land transactions reliably with dual routing to validators and Jito

Sending Transactions

Sending transactions overview
Build, optimize, and land transactions with priority fees, retries, and bundles

Priority Fee API
Estimate the right priority fee to land transactions fast without overpaying

Backrun rebates
Earn rebates on the backrun MEV your transactions create

MEV Protect
Route transactions privately to reduce frontrunning and sandwich attacks

The Solana Privacy Protocol

Overview
Programmable privacy for transfers and swaps with native Solana performance

Concepts
How Solana Rings work, user flows, and privacy guarantees

Additional Resources

SDKs
Official TypeScript and Rust SDKs for the Helius API

API reference
Complete method reference for every Helius RPC and REST endpoint

Helius for Agents
The MCP server, CLI, expert skills, and SDKs for building AI agents

RPC Benchmarks
Open-source latency and reliability comparisons vs other providers

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