sendBundle

Submit an atomic bundle of up to 5 signed transactions via Jito’s Block Engine. Proxied through your Helius RPC endpoint.

Submit a bundle of up to 5 fully-signed transactions for atomic execution. All transactions execute sequentially — if any fails, the entire bundle is rejected.

Requires a tip to a Jito tip account in at least one transaction.

Rate Limits

sendBundle is rate limited to 5 requests per second per project. getBundleStatuses and simulateBundle use the general RPC rate limit.

Need higher rate limits? Contact our sales team.

Endpoint

POST https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY

Request

jsonrpc · string · required

"2.0"

id · number · required

Request identifier.

method · string · required

"sendBundle"

params[0] · array[string] · required

Array of up to 5 fully-signed transactions, base64 encoded.

params[1].encoding · string

"base64" (recommended) or "base58". Default: "base58".

Query Parameters

mev-protect · boolean · default: "false"

When true, routes your bundle away from validators statistically linked to sandwich attacks. Opt-in per request. See MEV Protect.

Headers

jito-region · string

Optional. Route to a specific Jito Block Engine region. Values: ams, dub, fra, lon, nyc, slc, sgp, tyo, mainnet. If omitted, routes to the global endpoint (geo-routed to nearest).

Request Example

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": [
      [
        "BASE64_SIGNED_TX_1",
        "BASE64_SIGNED_TX_2"
      ],
      {
        "encoding": "base64"
      }
    ]
  }'

Response

result · string

Bundle ID (SHA-256 hash of the transaction signatures). Use with getBundleStatuses to track landing.

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

See Also

• Jito Bundles via Helius — full guide with region routing, tip accounts, and requirements
• getBundleStatuses — check bundle landing status
• simulateBundle — test bundles before submitting