POST
/
v1
/
wallets
/
{walletId}
/
addresses
/
{addressId}
/
contracts
/
write
/
sign
Custom Smart Contract Write Sign-Only
curl --request POST \
  --url https://api.blockradar.co/v1/wallets/{walletId}/addresses/{addressId}/contracts/write/sign \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "abi": [
    {
      "constant": false,
      "inputs": [
        {
          "name": "_to",
          "type": "address"
        },
        {
          "name": "_value",
          "type": "uint256"
        }
      ],
      "name": "transfer",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    }
  ],
  "address": "0x337610d27c682E347C9cD60BD4b3b107C9d34dDd",
  "method": "transfer",
  "parameters": [
    "0x2455eC6700092991Ce0782365A89d5Cd89c8Fa22",
    "100000"
  ]
}'
{
"data": {
"amlScreening": {},
"amount": null,
"amountPaid": null,
"amountUSD": "0.00",
"asset": null,
"assetSwept": null,
"assetSweptAmount": null,
"assetSweptAt": null,
"assetSweptGasFee": null,
"assetSweptHash": null,
"assetSweptRecipientAddress": null,
"assetSweptSenderAddress": null,
"blockHash": null,
"blockNumber": null,
"blockchain": {
"createdAt": "2024-05-27T14:31:14.966Z",
"derivationPath": "m/44'/60'/0'/0",
"id": "74733889-4ecd-403e-9840-94e87c043f24",
"isActive": true,
"isEvmCompatible": true,
"isL2": true,
"name": "base",
"slug": "base",
"symbol": "eth",
"tokenStandard": null,
"updatedAt": "2024-11-26T20:04:13.945Z"
},
"chainId": null,
"confirmations": null,
"confirmed": true,
"createdAt": "2025-08-11T22:21:56.077Z",
"currency": "USD",
"fee": null,
"feeHash": null,
"gasFee": null,
"gasPrice": null,
"gasUsed": null,
"hash": "0x229d811ef34a9f12454e89f12e06945dfc8122538a0af6369ec3f2a2f9aa8cbb",
"id": "fe2d8c39-a6ba-41cb-99e7-05c4dcee6c94",
"metadata": null,
"network": "testnet",
"note": null,
"rate": null,
"rateUSD": "0.00",
"reason": "{\"method\":\"transfer\",\"parameters\":[\"0x451dEFC27B45808078e875556AF06bCFdC697BA4\",\"10000\"],\"abi\":{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}}",
"recipientAddress": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"reference": "xvLz7CIFoD",
"senderAddress": "0x947514e4B803e312C312da0F1B41fEDdbe15ae7a",
"signedTransaction": "0xf8ab3e83124fc08301623d94036cbd53842c5426634e7929541ec2318f3dcf7e80b844a9059cbb000000000000000000000000451defc27b45808078e875556af06bcfdc697ba400000000000000000000000000000000000000000000000000000000000027108302948ca0c86783ba50374a959907d9174c2a0b5cd3a87d55336e6c9a6420fde0dd07303ea019a93dad742a9bed4c6d1f514f7fe26777e8f17fe090967a9719afddaa281d64",
"status": "SUCCESS",
"toAmount": null,
"toCurrency": null,
"tokenAddress": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"type": "SIGNED",
"updatedAt": "2025-08-11T22:21:56.077Z",
"wallet": {
"address": "0x947514e4B803e312C312da0F1B41fEDdbe15ae7a",
"configurations": null,
"createdAt": "2024-08-22T16:05:46.167Z",
"derivationPath": "m/44'/60'/0'/0/0",
"description": "This is Base wallet",
"id": "e17dea25-6c01-4b3a-a4ae-51f411bf69cd",
"isActive": true,
"name": "Base Wallet",
"network": "testnet",
"status": "ACTIVE",
"updatedAt": "2024-08-22T16:05:46.167Z"
}
},
"message": "Contract write signed successfully",
"statusCode": 200
}

Authorizations

x-api-key
string
header
required

Path Parameters

walletId
string
required
Example:

"YOUR_WALLET_ID"

addressId
string
required
Example:

"ADDRESS_ID"

Body

application/json

Response

200 - application/json

Tron / Ethereum

The response is of type object.