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debug_traceCall

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debug_traceCall simulates a contract call exactly as eth_call would, but instead of returning only the call's return data it returns a structured EVM execution trace. The call is evaluated against the state at the supplied block — nothing is broadcast and no state is persisted. Use it to debug why a call reverts, to inspect internal call hierarchies and gas accounting, or to preview the effect of a transaction before sending it.

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

By default the method uses the built-in struct/opcode logger, which emits one entry per executed opcode. For higher-level output pass a named tracer such as callTracer (call hierarchy) or prestateTracer (pre-execution state) in the options object.

Parameters

This method takes no parameters.

Returns

debug_traceCall return value
FieldType
resultobject

Examples

curl https://triport.io/sol \
  -X POST -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <api-key>' \
  -d '{"id":1,"method":"debug_traceCall","params":[],"jsonrpc":"2.0"}'
const res = await fetch("https://triport.io/sol", {
  method: "POST",
  headers: { "Content-Type": "application/json", Authorization: "Bearer <api-key>" },
  body: JSON.stringify({
  "id": 1,
  "method": "debug_traceCall",
  "params": [],
  "jsonrpc": "2.0"
}),
});
const data = await res.json();
import requests
resp = requests.post(
    "https://triport.io/sol",
    headers={"Authorization": "Bearer <api-key>"},
    json={"id":1,"method":"debug_traceCall","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 debug_traceCall do?
Executes an eth_call against the state of a chosen block and returns the full EVM execution trace, without broadcasting a transaction.
How many credits does debug_traceCall cost?
debug_traceCall costs 5 credit(s) per call on Triport by default.
Is debug_traceCall available over WebSocket?
debug_traceCall is an HTTP JSON-RPC method.