EVM Raw Transactions

Use the EVM raw transaction format to create arbitrary EVM contract calls. For simple transfers or allowance revocations, consider using the dedicated higher-level formats (see EVM Transfers and EVM Revoke Allowances).

For more tutorials on calling EVM smart contracts, check out our pubic API Examples repository on Github.

Required parameters

When creating an EVM transaction request, you need to specify:

Request type parameters

• type: Set to evm_transaction
• details.type: Set to evm_raw_transaction
• signer_type: In most cases, set it to api_signer

Network parameter

• chain: The target chain (can be specified as chain name or chain ID)

{
    // ...
    "chain": "evm_1"
}

Transaction parameters

• vault_id: The origin vault identifier
• to: The recipient's address
• value: The transaction value in wei
• data: The call data, which can be specified in either hex or Base64 format.

The following examples show how to create transaction requests using the two different supported data formats:

{
    "vault_id": "16b5aa12-509e-4944-b656-cf096515d627",
    "signer_type": "api_signer",
    "type": "evm_transaction",
    "details": {
        "type": "evm_raw_transaction",
        "chain": "ethereum_mainnet",
        "gas": {
            "type": "priority",
            "priority_level": "medium"
        },
        "to": "0x565697B5DD1F7Bdc61f774807057D058E5A27cbC",
        "value": "0",
        "data": {
            "type": "hex",
            "hex_data": "0x0d1d7ae50000000000000000000000000000000000000000000000000000000000000006"
        }
    }
}

Gas price

When creating an EVM transaction, you must specify the gas price, by populating the details.gas field of the request.

There are two ways to specify it:

• The simplest way is to let Fordefi set the gas price based on the chain's current gas price. You can choose between low, medium, and high gas levels, which translate to different percentiles of recent gas prices. To do this, set the type to priority and the priority_level to one of the following: low, medium, or high.
• You can also specify a gas price in wei manually. To do this, set the type to manual and the gas_price to the price you want to use.

Examples:

{
    // ...
    "details": {
        // ...
        "gas": {
            "type": "priority",
            "priority_level": "medium"
        }
    }
}

Optional: Gas limit

The gas limit is the maximum amount of gas that can be used to execute the transaction. By default, it is set automatically by Fordefi using the eth_estimateGas method of the node's JSON-RPC interface.

You can optionally specify a custom gas limit by setting the details.gas.gas_limit field in the request. If omitted, Fordefi will automatically estimate an appropriate gas limit for the transaction.

Example with custom gas limit:

{
    // ...
    "details": {
        // ...
        "gas": {
            // ...
            "gas_limit": "1000000"
        }
    }
}

Optional: MEV protection

Fordefi offers MEV protection for transactions on Ethereum Mainnet by sending the transaction to a secure node (Flashbots Protect) as opposed to the public mempool.

To enable MEV protection, set the use_secure_node field to true.

{
    // ...
    "details": {
        // ...
        "use_secure_node": true
    }
}