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POST
/
v1
/
wallets
/
{id}
/
addresses
/
{addressId}
/
signing
/
transaction
Child Address Sign Transaction
curl --request POST \
  --url https://api.blockradar.co/v1/wallets/{id}/addresses/{addressId}/signing/transaction \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "transaction": "{\"to\":\"0x000000000000000000000000000000000000dEaD\",\"value\":\"0x5af3107a4000\",\"nonce\":4,\"chainId\":11155111,\"gasLimit\":\"0x5208\",\"maxFeePerGas\":\"0x59682f00\",\"maxPriorityFeePerGas\":\"0x3b9aca00\",\"type\":2}",
  "reference": "eth-child-transfer-001",
  "metadata": {
    "source": "custom"
  }
}
'
{
  "statusCode": 200,
  "message": "Transaction signed successfully",
  "data": {
    "id": "02f404a5-d13e-4bcf-8ad5-c5f51c04fa49",
    "reference": "eth-child-transfer-001",
    "senderAddress": "0x82888b11790ddC1946e1AA650E0127b2E9023233",
    "recipientAddress": "0x82888b11790ddC1946e1AA650E0127b2E9023233",
    "hash": "0xac4c73ca084608ac6b981e54db948dc80c15b4ea3ffd0c9f5781f3af7ad6fe51",
    "confirmed": true,
    "status": "SUCCESS",
    "type": "SIGNED",
    "createdChannel": "api",
    "reason": "Transaction signed",
    "network": "testnet",
    "chainId": 11155111,
    "metadata": null,
    "signedTransaction": "0x02f87383aa36a763843b9aca008459682f0082520894000000000000000000000000000000000000dead865af3107a400080c080a0b760...",
    "amount": null,
    "amountUSD": "0.00",
    "fee": null,
    "feeUSD": null,
    "currency": "USD",
    "createdAt": "2026-03-19T13:34:24.937Z",
    "updatedAt": "2026-03-19T13:34:24.937Z",
    "wallet": {
      "id": "3f9aca5c-38ee-4e1d-ab67-c084a2e37bb2",
      "name": "Ethereum Wallet",
      "address": "0xC887a3Cb8E7AbA4A77D7275AD4B242f71cbd5446",
      "isActive": true,
      "status": "ACTIVE",
      "network": "testnet"
    },
    "asset": null,
    "blockchain": {
      "id": "85ffc132-3972-4c9e-99a5-5cf0ccb688bf",
      "name": "ethereum",
      "symbol": "eth",
      "slug": "ethereum",
      "isEvmCompatible": true,
      "tokenStandard": "ERC20"
    },
    "beneficiary": null
  }
}

Authorizations

​
x-api-key
string
header
required

Path Parameters

​
id
string
required
Example:

"YOUR_WALLET_ID"

​
addressId
string
required
Example:

"ADDRESS_OR_ID"

Body

application/json
​
transaction
string
required

The serialized unsigned transaction. Base64 for Solana, JSON string for EVM and Tron.

Example:

"{\"to\":\"0x000000000000000000000000000000000000dEaD\",\"value\":\"0x5af3107a4000\",\"nonce\":4,\"chainId\":11155111,\"gasLimit\":\"0x5208\",\"maxFeePerGas\":\"0x59682f00\",\"maxPriorityFeePerGas\":\"0x3b9aca00\",\"type\":2}"

​
reference
string

Your internal tracking ID.

Example:

"eth-child-transfer-001"

​
metadata
object

Custom key-value pairs stored with the transaction record.

Example:
{ "source": "custom" }

Response

Transaction signed successfully

​
statusCode
number
Example:

200

​
message
string
Example:

"Transaction signed successfully"

​
data
object