debug_traceCall - Celo

Example code for the debug_traceCall JSON-RPC method. Complete guide on how to use debug_traceCall JSON-RPC in GetBlock Web3 documentation.

This method traces a call without creating a transaction on the Celo network. This is useful for simulating and debugging contract calls before submitting transactions.

Parameters

Parameter	Type	Required	Description
callObject	object	Yes	Transaction call object
blockNumber	string	Yes	Block number or "latest"
options	object	No	Tracer configuration

Request Example

cURL

cURL

curl -X POST https://go.getblock.io/<ACCESS-TOKEN>/ \
-H "Content-Type: application/json" \
-d '{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "method": "debug_traceCall",
  "params": [
    {
      "to": "0x765DE816845861e75A25fCA122bb6898B8B1282a",
      "data": "0x70a08231000000000000000000000000742d35cc6634c0532925a3b844bc9e7595f8bb45"
    },
    "latest",
    {"tracer": "callTracer"}
  ]
}'

JavaScript (Axios)

Python

Response Example

Response (JSON)

{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "result": {
    "type": "CALL",
    "from": "0x0000000000000000000000000000000000000000",
    "to": "0x765de816845861e75a25fca122bb6898b8b1282a",
    "gas": "0x2faf080",
    "gasUsed": "0x5a0",
    "input": "0x70a08231...",
    "output": "0x0000000000000000000000000000000000000000000000000de0b6b3a7640000"
  }
}

Response Definition

Field	Type	Description
result	object	Execution trace

Use Cases

• Simulate contract calls

• Debug before submitting transactions

• Analyze gas usage

• Test cUSD/cEUR interactions

Error Handling

Error Code	Description
-32602	Invalid params
-32603	Internal error
-32000	Execution error