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eth_callBundle

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eth_callBundle runs an ordered list of signed, raw transactions as an atomic bundle against a target block and returns what each transaction would do — gas used, return value, and any revert — without broadcasting anything to the network. It is the dry-run companion to eth_sendBundle: use it to validate a bundle, estimate its coinbase payment, and confirm ordering before you commit real funds.

The bundle is simulated as if it were placed at the top of blockNumber, on top of the state at the end of stateBlockNumber. Because nothing is submitted, a successful response is not a guarantee of inclusion — it only tells you the outcome given the supplied state. Re-simulate against fresh blocks before sending, since mempool state moves every block.

This method is gated to the pro tier and above. Calls authenticated with a free-tier key are rejected with -32002.

Parameters

This method takes no parameters.

Returns

eth_callBundle return value
FieldType
resultobject

Examples

curl https://triport.io/eth \
  -X POST -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <api-key>' \
  -d '{"id":1,"method":"eth_callBundle","params":[],"jsonrpc":"2.0"}'
const res = await fetch("https://triport.io/eth", {
  method: "POST",
  headers: { "Content-Type": "application/json", Authorization: "Bearer <api-key>" },
  body: JSON.stringify({
  "id": 1,
  "method": "eth_callBundle",
  "params": [],
  "jsonrpc": "2.0"
}),
});
const data = await res.json();
import requests
resp = requests.post(
    "https://triport.io/eth",
    headers={"Authorization": "Bearer <api-key>"},
    json={"id":1,"method":"eth_callBundle","params":[],"jsonrpc":"2.0"},
)
print(resp.json())

Usage

  1. Transport: HTTP (JSON-RPC).
  2. Networks: mainnet.
  3. Credit cost: 5 per call.

FAQ

What does eth_callBundle do?
Simulates a Flashbots-style bundle of transactions against a chosen block without submitting it, returning the per-transaction execution results.
How many credits does eth_callBundle cost?
eth_callBundle costs 5 credit(s) per call on Triport by default.
Is eth_callBundle available over WebSocket?
eth_callBundle is an HTTP JSON-RPC method.