Bundles via Helius

Send basic bundles through your Helius RPC endpoint. Atomic, all-or-nothing execution of up to 5 transactions, proxied directly to Jito.

This is the basic bundle path — a direct Jito proxy, billed per send, best when you need atomic execution without a latency requirement. If you’re a trader who needs low latency and the priority tip buffer, use Sender Max bundles instead.

Basic bundles give you atomic, all-or-nothing execution of up to 5 transactions, proxied directly to Jito. Each sendBundle submission is billed as 1 credit from your plan.

Supported Methods

Method	Description	Rate Limit
sendBundle	Submit a bundle	5 RPS per project
simulateBundle	Simulate a bundle without submitting	General RPC rate limit

Need higher rate limits? Contact our sales team.

sendBundle

Submits a list of signed transactions as an atomic bundle. If the bundle is accepted, returns a bundle_id (SHA-256 hash of the transaction signatures). This does not guarantee the bundle will land on-chain. Check for transaction confirmation on chain to verify.

A tip is required. At least one transaction must transfer SOL to a Helius tip account. If the tip is too low, the bundle may not be selected for inclusion.

Request

Parameter	Type	Description
params[0]	array[string]	Required. Up to 5 fully-signed transactions, base64 encoded.
params[1].encoding	string	Optional. base64 (recommended) or base58. Default: base58.

Example

curl "https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY" \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "sendBundle",
    "params": [
      [
        "AT2AqtlokikUWgGNnSX5xrmdvBjSaiIPxvFz6zc5Abn5Z0CPFW5GO+Y3rXceLnqLgQFnGw0yTk3NtJdFNsbrwwQBAAIEsXPDJ9cMVbpFQYClVM7PGLh8JOfCD6E2vz5VNmBCF+p4Uhyxec67hYm1VqLV7JTSSYaC/fm7KvWtZOSRzEFT2gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABUpTWpkpIQZNJOhxYNo4fHw1td28kruB5B+oQEEFRI1i3Wzl2VfewCI8oYXParnP78725sKFzYheTEn8v865YQIDABhqaXRvIGJ1bmRsZSAwOiBqaXRvIHRlc3QCAgABDAIAAACghgEAAAAAAA==",
        "AS6fOZuGDsmyYdd+RC0fiFUgNe1BYTOYT+1hkRXHAeroC8R60h3g34EPF5Ys8sGzVBMP9MDSTVgy1/SSTqpCtA4BAAIEsXPDJ9cMVbpFQYClVM7PGLh8JOfCD6E2vz5VNmBCF+p4Uhyxec67hYm1VqLV7JTSSYaC/fm7KvWtZOSRzEFT2gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABUpTWpkpIQZNJOhxYNo4fHw1td28kruB5B+oQEEFRI1i3Wzl2VfewCI8oYXParnP78725sKFzYheTEn8v865YQIDABhqaXRvIGJ1bmRsZSAxOiBqaXRvIHRlc3QCAgABDAIAAACghgEAAAAAAA=="
      ],
      {
        "encoding": "base64"
      }
    ]
  }'

Response

{
  "jsonrpc": "2.0",
  "result": "892b79ed49138bfb3aa5441f0df6e06ef34f9ee8f3976c15b323605bae0cf51d",
  "id": 1
}

The result is the bundle ID — use it with getBundleStatuses to track landing.

getBundleStatuses

Returns the status of submitted bundles. If a bundle has not landed or is not found, it returns null.

Request

Parameter	Type	Description
params[0]	array[string]	Required. Up to 5 bundle IDs.

Example

curl "https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY" \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getBundleStatuses",
    "params": [
      [
        "892b79ed49138bfb3aa5441f0df6e06ef34f9ee8f3976c15b323605bae0cf51d"
      ]
    ]
  }'

Response

{
  "jsonrpc": "2.0",
  "result": {
    "context": {
      "slot": 242806119
    },
    "value": [
      {
        "bundle_id": "892b79ed49138bfb3aa5441f0df6e06ef34f9ee8f3976c15b323605bae0cf51d",
        "transactions": [
          "3bC2M9fiACSjkTXZDgeNAuQ4ScTsdKGwR42ytFdhUvikqTmBheUxfsR1fDVsM5ADCMMspuwGkdm1uKbU246x5aE3",
          "8t9hKYEYNbLvNqiSzP96S13XF1C2f1ro271Kdf7bkZ6EpjPLuDff1ywRy4gfaGSTubsM2FeYGDoT64ZwPm1cQUt"
        ],
        "slot": 242804011,
        "confirmation_status": "finalized",
        "err": {
          "Ok": null
        }
      }
    ]
  },
  "id": 1
}

Returns null in the value array for bundles not found.

Region Routing

By default, Helius routes your bundle to Jito’s global endpoint (mainnet.block-engine.jito.wtf), which geo-routes to the nearest Block Engine automatically.

To target a specific region, set the jito-region HTTP header:

Header Value	Block Engine Region
ams	Amsterdam
dub	Dublin
fra	Frankfurt
lon	London
nyc	New York
slc	Salt Lake City
sgp	Singapore
tyo	Tokyo
mainnet	Global (geo-routed)

Example with Region

curl "https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY" \
  -X POST \
  -H "Content-Type: application/json" \
  -H "jito-region: nyc" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "sendBundle",
    "params": [
      [
        "AT2AqtlokikUWgGNnSX5xrmdvBjSaiIPxvFz6zc5Abn5Z0CPFW5GO+Y3rXceLnqLgQFnGw0yTk3NtJdFNsbrwwQBAAIEsXPDJ9cMVbpFQYClVM7PGLh8JOfCD6E2vz5VNmBCF+p4Uhyxec67hYm1VqLV7JTSSYaC/fm7KvWtZOSRzEFT2gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABUpTWpkpIQZNJOhxYNo4fHw1td28kruB5B+oQEEFRI1i3Wzl2VfewCI8oYXParnP78725sKFzYheTEn8v865YQIDABhqaXRvIGJ1bmRsZSAwOiBqaXRvIHRlc3QCAgABDAIAAACghgEAAAAAAA==",
        "AS6fOZuGDsmyYdd+RC0fiFUgNe1BYTOYT+1hkRXHAeroC8R60h3g34EPF5Ys8sGzVBMP9MDSTVgy1/SSTqpCtA4BAAIEsXPDJ9cMVbpFQYClVM7PGLh8JOfCD6E2vz5VNmBCF+p4Uhyxec67hYm1VqLV7JTSSYaC/fm7KvWtZOSRzEFT2gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABUpTWpkpIQZNJOhxYNo4fHw1td28kruB5B+oQEEFRI1i3Wzl2VfewCI8oYXParnP78725sKFzYheTEn8v865YQIDABhqaXRvIGJ1bmRsZSAxOiBqaXRvIHRlc3QCAgABDAIAAACghgEAAAAAAA=="
      ],
      {
        "encoding": "base64"
      }
    ]
  }'

Tip Accounts

At least one transaction in your bundle must include a SOL transfer to one of these tip accounts. Pick one at random to reduce contention.

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

Minimum tip is 5,000 lamports.

Bundle Requirements

• Max 5 transactions per bundle
• All transactions must be fully signed
• Use base64 encoding (recommended over base58 for performance)
• At least one transaction must include a tip
• Transactions execute sequentially — tx2 can depend on state changes from tx1

simulateBundle (Optional)

You can optionally simulate your bundle before submitting to check for errors:

curl "https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY" \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "simulateBundle",
    "params": [
      {
        "encodedTransactions": [
          "AT2AqtlokikUWgGNnSX5xrmdvBjSaiIPxvFz6zc5Abn5Z0CPFW5GO+Y3rXceLnqLgQFnGw0yTk3NtJdFNsbrwwQBAAIEsXPDJ9cMVbpFQYClVM7PGLh8JOfCD6E2vz5VNmBCF+p4Uhyxec67hYm1VqLV7JTSSYaC/fm7KvWtZOSRzEFT2gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABUpTWpkpIQZNJOhxYNo4fHw1td28kruB5B+oQEEFRI1i3Wzl2VfewCI8oYXParnP78725sKFzYheTEn8v865YQIDABhqaXRvIGJ1bmRsZSAwOiBqaXRvIHRlc3QCAgABDAIAAACghgEAAAAAAA==",
          "AS6fOZuGDsmyYdd+RC0fiFUgNe1BYTOYT+1hkRXHAeroC8R60h3g34EPF5Ys8sGzVBMP9MDSTVgy1/SSTqpCtA4BAAIEsXPDJ9cMVbpFQYClVM7PGLh8JOfCD6E2vz5VNmBCF+p4Uhyxec67hYm1VqLV7JTSSYaC/fm7KvWtZOSRzEFT2gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABUpTWpkpIQZNJOhxYNo4fHw1td28kruB5B+oQEEFRI1i3Wzl2VfewCI8oYXParnP78725sKFzYheTEn8v865YQIDABhqaXRvIGJ1bmRsZSAxOiBqaXRvIHRlc3QCAgABDAIAAACghgEAAAAAAA=="
        ]
      }
    ]
  }'

Protect against sandwich attacks

To route your bundle away from validators statistically linked to sandwich attacks, add the mev-protect=true query parameter to your RPC URL — no changes to your bundle:

https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY&mev-protect=true

See also

MEV Protect

Route around validators statistically linked to sandwich attacks.

Transaction Rebates

Opt in on single sendTransaction calls to earn a share of the MEV your transactions create, paid in SOL.