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trace_call

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`trace_call` simulates a transaction call exactly as [`eth_call`](./eth_call.md) would, evaluating it against the state at a chosen block, but instead of returning only the call's return data it returns the Parity/OpenEthereum-style traces you ask for. Nothing is broadcast and no state is persisted. Use it to inspect the internal call hierarchy of a transaction, to preview the exact storage and balance changes a call would cause, or to capture a low-level VM execution trace — all before sending the transaction on-chain.

You control which traces are produced with a **trace-type array**. Request any combination of:

- `trace` — the flat list of call/create/suicide actions (the call tree). - `vmTrace` — a full virtual-machine execution trace, opcode by opcode. - `stateDiff` — the set of storage, balance, nonce, and code changes the call would apply, expressed as before/after diffs.

The method belongs to the `trace` namespace and is available on the **pro** and **business** tiers. Because producing traces is more expensive than a plain `eth_call`, the per-second limits are lower than for standard `eth_*` read methods.

Parameters

This method takes no parameters.

Returns

trace_call return value
FieldType
resultobject

Examples

curl https://<your-endpoint>/ \
  -X POST -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"trace_call","params":[]}'
const res = await fetch("https://<your-endpoint>/", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "id": 1,
  "method": "trace_call",
  "params": [],
  "jsonrpc": "2.0"
}),
});
const data = await res.json();
import requests
resp = requests.post("https://<your-endpoint>/", json={"id":1,"method":"trace_call","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 trace_call do?
Executes a transaction call against the state of a chosen block and returns the requested Parity-style traces (`trace`, `vmTrace`, `stateDiff`) without broadcasting anything.
How many credits does trace_call cost?
trace_call costs 5 credit(s) per call on Triport by default.
Is trace_call available over WebSocket?
trace_call is an HTTP JSON-RPC method.