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
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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