> ## Documentation Index
> Fetch the complete documentation index at: https://www.helius.dev/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# 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.

> [!TIP]
>
> 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](https://www.helius.dev/docs/sending-transactions/sender-max.md#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 |

> [!TIP]
>
> Need higher rate limits? [Contact our sales
> team](https://www.helius.dev/contact).

## 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](#tip-accounts). 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

```bash theme={"system"}
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

```json theme={"system"}
{
  "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

```bash theme={"system"}
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

```json theme={"system"}
{
  "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

```bash theme={"system"}
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.

```text theme={"system"}
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:

```bash theme={"system"}
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

> [card] [MEV Protect](https://www.helius.dev/docs/sending-transactions/mev-protect.md)
>
> Route around validators statistically linked to sandwich attacks.

> [card] [Transaction Rebates](https://www.helius.dev/docs/sending-transactions/backrun-rebates.md)
>
> Opt in on single `sendTransaction` calls to earn a share of the MEV your transactions create, paid in SOL.


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