Retrieve Internal Transactions from a Transaction Hash

Internal transactions, also known as “subcalls” or “contract calls,” represent interactions between smart contracts during the execution of a blockchain transaction.
These transactions can be accessed using the `debug_traceTransaction` method in an Ethereum-compatible RPC interface.
## Using "debug_traceTransaction"
The `debug_traceTransaction` method provides detailed information about all opcodes executed during the transaction. While this is comprehensive, it may be excessive if you only need internal transactions. By passing the parameter `{ "tracer": "callTracer" }` , you can limit the output to only the internal transactions.
### Example Request
Below is an example of how to retrieve internal transactions using the `debug_traceTransaction` method with the `callTracer` parameter:
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​x
}
 
curl --location 'https://ethereum-mainnet.gateway.tatum.io' \
--header 'Content-Type: application/json' \
--header 'x-api-key: {YOUR_API_KEY}' \
--data '{
    "jsonrpc":"2.0",
    "method":"debug_traceTransaction",
    "params":["0x16c52c58916c1e91736df3242f3c85a5bb597bcc648c7a2bd05555e8d054168c",
        {
            "tracer":"callTracer",
            "timeout": "90s"
        }
    ],
    "id":1
}'
//Response:
{
    "id": 1,
    "jsonrpc": "2.0",
    "result": {
        "from": "0x7830c87c02e56aff27fa8ab1241711331fa86f43",
        "gas": "0x1e8480",
        "gasUsed": "0x6bd4a",
        "to": "0xa9d1e08c7793af67e9d92fe308d5697fb81d3e43",
        "input": "...",
        "calls": [
**Key Fields in the Response**
`from`: The address initiating the internal transaction.
`to`: The recipient address of the internal transaction.
`gas`: The gas allocated for the internal transaction.
`gasUsed`: The gas used by the internal transaction.
`value`: The amount of Ether (or equivalent) transferred.
`type`: The type of call (e.g., CALL, DELEGATECALL).
## Good to Know
Debug and Trace methods may require access to [Archival Data](🔗﻿)﻿
The `callTracer` is efficient for extracting internal transactions but may still be resource-intensive for large transactions. 
A `Timeout` flag may be required in your request.
Find the list of supported blockchains [HERE](🔗﻿).
Find more about available authentication methods [HERE](🔗﻿).