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Helius Sender is a specialized service for ultra-low latency transaction submission. It sends transactions to both Solana validators and Jito simultaneously, providing multiple pathways for block inclusion.

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Capabilities

CapabilityDescription
Dual routingSends to both validators and Jito for maximum inclusion probability
Global endpointsHTTPS for frontends, regional HTTP for backends
No credit costAvailable on all plans without consuming API credits
Connection warmingPing endpoints to maintain warm connections
SWQOS-only modeCost-optimized routing with lower tip requirements
High throughputDefault 50 TPS, upgradable for Professional plans

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Key Information for Agents

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Endpoints

# Frontend (HTTPS, auto-routes to nearest)
https://sender.helius-rpc.com/fast

# Backend (regional HTTP)
http://slc-sender.helius-rpc.com/fast      # Salt Lake City
http://ewr-sender.helius-rpc.com/fast      # Newark
http://lon-sender.helius-rpc.com/fast      # London
http://fra-sender.helius-rpc.com/fast      # Frankfurt
http://ams-sender.helius-rpc.com/fast      # Amsterdam
http://sg-sender.helius-rpc.com/fast       # Singapore
http://tyo-sender.helius-rpc.com/fast      # Tokyo

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Requirements

All Sender transactions must include:
  1. skipPreflight: true — mandatory
  2. Jito tip — minimum 0.0002 SOL transfer to a designated tip account (0.000005 SOL for SWQOS-only)
  3. Priority fee — via ComputeBudgetProgram.setComputeUnitPrice

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Request Format

{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "sendTransaction",
  "params": [
    "BASE64_ENCODED_TRANSACTION",
    {
      "encoding": "base64",
      "skipPreflight": true,
      "maxRetries": 0
    }
  ]
}

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Tip Accounts (mainnet-beta)

4ACfpUFoaSD9bfPdeu6DBt89gB6ENTeHBXCAi87NhDEE
D2L6yPZ2FmmmTKPgzaMKdhu6EWZcTpLy1Vhx8uvZe7NZ
9bnz4RShgq1hAnLnZbP8kbgBg1kEmcJBYQq3gQbmnSta
5VY91ws6B2hMmBFRsXkoAAdsPHBJwRfBht4DXox3xkwn
2nyhqdwKcJZR2vcqCyrYsaPVdAnFoJjiksCXJ7hfEYgD
2q5pghRs6arqVjRvT5gfgWfWcHWmw1ZuCzphgd5KfWGJ
wyvPkWjVZz1M8fHQnMMCDTQDbkManefNNhweYk5WkcF
3KCKozbAaF75qEU33jtzozcJ29yJuaLJTy2jFdzUY8bT
4vieeGHPYPG2MmyPRcYjdiDmmhN3ww7hsFNap8pVN3Ey
4TQLFNWK8AovT1gFvda5jfw2oJeRMKEmw7aH6MGBJ3or

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Example Agent Prompts

Use these prompts with an AI tool connected to the Helius MCP server:
  • “Build a transaction sending function using Helius Sender with proper tips and priority fees”
  • “How do I use Helius Sender with the Jupiter swap API?”
  • “Show me how to implement retry logic for Sender transactions”
  • “What’s the difference between default dual routing and SWQOS-only mode?”
  • “How do I warm Sender connections to reduce cold start latency?”

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Resources

Sender Documentation

Full Sender documentation with code examples

API Reference

Sender API reference with request/response schemas