Submit Bundles

Submit multiple transactions as an atomic bundle. All transactions succeed together or all fail.

---

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "sendBundle",
  "params": [
    [
      "<base64_tx_1>",
      "<base64_tx_2>",
      "<base64_tx_3>"
    ],
    {
      "encoding": "base64",
      "skipPreflight": true
    }
  ]
}

---

Parameters

Parameter	Type	Required	Default	Description
transactions	string[]	Yes	—	Array of base64 encoded signed transactions (max 4)
encoding	string	No	"base64"	"base64"
skipPreflight	boolean	No	true	Skip preflight simulation

---

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "bundle_id": "abc123def456...",
    "signatures": [
      "5VERv8NMvzbJMEkV8xnrLkEaWRtSz9Co...",
      "3XHA7ofPAf3FaLUAY3kT52c9dwek2Gbi..."
    ]
  }
}

---

Endpoint

POST https://global.blocksprint.io/bundle/v1/YOUR_API_KEY

Alternative:

POST https://global.blocksprint.io/bundle

With X-API-Key header or ?api_key= query parameter.

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URI Parameters

Constraint	Type	Default	Description
revertProtection	bool	false	Enables revert protection

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Bundle Limits

Constraint	Limit
Max transactions	4
Min transactions	1
Max transaction size	1,232 bytes (4,096 bytes for Transaction V1)
Min tip	0.001 SOL to a BlockSprint tip address, in one of the bundle's transactions

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How Bundles Work

Atomic execution

All transactions execute together.

Sequential order

Transactions execute in the order they appear in the array.

Revert protection

If any transaction fails, the entire bundle reverts.

Multi-provider

Bundles are sent to Jito.

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Use Cases

Arbitrage

const bundle = [
  buyOnDexA,   // Buy token
  sellOnDexB,  // Sell token for profit
];

Flash Loans

const bundle = [
  flashBorrow,
  executeStrategy,
  flashRepay,
];

NFT Operations

const bundle = [
  approveSpend,
  buyNft,
];

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Code Examples

curl

go

javascript

python

rust

typescript

jupiter swap