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import { Tabs, Steps } from 'nextra/components'

Transaction data decoder

This guide shows how to use the Safe Transaction Service API to decode transaction data for contract interactions.

The different steps are implemented using Curl requests and the Safe{Core} SDK TypeScript library.

Prerequisites

  1. Node.js and npm when using the Safe{Core} SDK.
  2. Have a Safe account.

Steps

### Install dependencies

{/* */}

<Tabs items={['TypeScript', 'Python']}> <Tabs.Tab> bash yarn add @safe-global/api-kit </Tabs.Tab> <Tabs.Tab> bash pip install safe-eth-py web3 </Tabs.Tab>

{/* */}

Imports

{/* */}

<Tabs items={['TypeScript', 'Python']}> <Tabs.Tab> typescript import SafeApiKit from '@safe-global/api-kit' </Tabs.Tab> <Tabs.Tab> python from eth_typing import HexStr from gnosis.eth import EthereumClient, EthereumNetwork from gnosis.safe.api.transaction_service_api import TransactionServiceApi </Tabs.Tab>

{/* */}

Decode transaction data

{/* */}

<Tabs items={['TypeScript', 'Python', 'Curl']}> <Tabs.Tab> ```typescript // Initialize the API Kit const apiKit = new SafeApiKit({ chainId: 11155111n })

  const data = "0x095ea7b3000000000000000000000000e6fc577e87f7c977c4393300417dcc592d90acf8ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
  const dataDecoded = await apiKit.decodeData(data);

  // This decoded data is also included as dataDecoded in the response of the apiKit's getMultisigTransactions, getModuleTransactions, and getAllTransactions methods.
  ```
</Tabs.Tab>
<Tabs.Tab>
  ```python
  # Instantiate the Transaction Service API
  ethereum_client = EthereumClient(config.get("RPC_URL"))
  transaction_service_api = TransactionServiceApi(
        EthereumNetwork.SEPOLIA,
        ethereum_client=ethereum_client
    )

  # Get decoded data
  data = HexStr("0x095ea7b3000000000000000000000000e6fc577e87f7c977c4393300417dcc592d90acf8ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")
  to = "0x4127839cdf4F73d9fC9a2C2861d8d1799e9DF40C" # Optional
  data_decoded = transaction_service_api.decode_data(data, to)

  # This decoded data is also included as dataDecoded in the response of the get_safe_transaction and get_transactions methods of the TransactionServiceApi.
  ```
</Tabs.Tab>
<Tabs.Tab>
  ```bash
  curl -X 'POST' \
    'https://safe-transaction-sepolia.safe.global/api/v1/data-decoder/' \
    -H 'accept: application/json' \
    -H 'Content-Type: application/json' \
    -H 'X-CSRFToken: Gx1aRa8kIJGIAfReLAWwr9Q6dHv22dFt7VprdipLryHcxpfhk9aV0UDAhNz8gGYz' \
    -d '{
        "data": "0x095ea7b3000000000000000000000000e6fc577e87f7c977c4393300417dcc592d90acf8ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
    }'

  # This decoded data is also included as dataDecoded in the GET /multisig-transactions, GET /module-transactions, and GET /all-transactions endpoints.
  ```
</Tabs.Tab>

{/* */}