Master Wallet Write Sign-Only

This API provides endpoints for interacting with smart contracts on the blockchain. It allows for executing contract functions without broadcasting

Request Body

The request body should be in raw format and include the following parameters:

Parameter	Type	Required	Description
address	string	Yes	The address of the contract.
method	string	Yes	The method to be called on the contract.
parameters	array	Yes	An array of parameters to pass to the method.
abi	array	Yes	An array containing the ABI of the contract or method.

POST /v1/wallets/{walletId}/contracts/write/sign

Try it

Master Wallet Write Sign-Only

cURL

curl --request POST \
  --url https://api.blockradar.co/v1/wallets/{walletId}/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": "TXYZopYRdj2D9XRtbG411XZZ3kM5VkAeBf",
  "method": "transfer",
  "parameters": [
    "TRjn21ENcbPhLAec6aeCwVwNYmxK687cKr",
    "100000"
  ]
}
'

200

Ethereum

{
  "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"

Body

application/json

abi · object[]

Show child attributes

abi. constant · boolean

Example:

false

abi. inputs · object[]

Show child attributes

abi.inputs. name · string

Example:

"_to"

abi.inputs. type · string

Example:

"address"

Example:

[
  { "name": "_to", "type": "address" },
  { "name": "_value", "type": "uint256" }
]

abi. name · string

Example:

"transfer"

abi. outputs · any[]

Example:

[]

abi. payable · boolean

Example:

false

abi. stateMutability · string

Example:

"nonpayable"

abi. type · string

Example:

"function"

Example:

[
  {
    "constant": false,
    "inputs": [
      { "name": "_to", "type": "address" },
      { "name": "_value", "type": "uint256" }
    ],
    "name": "transfer",
    "outputs": [],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  }
]

address · string

Example:

"TXYZopYRdj2D9XRtbG411XZZ3kM5VkAeBf"

method · string

Example:

"transfer"

parameters · string[]

Example:

[
  "TRjn21ENcbPhLAec6aeCwVwNYmxK687cKr",
  "100000"
]

Response

200 - application/json

Ethereum / Tron

data · object

Show child attributes

data. amlScreening · object

data. amount · unknown

data. amountPaid · unknown

data. amountUSD · string

Example:

"0.00"

data. asset · unknown

data. assetSwept · unknown

data. assetSweptAmount · unknown

data. assetSweptAt · unknown

data. assetSweptGasFee · unknown

data. assetSweptHash · unknown

data. assetSweptRecipientAddress · unknown

data. assetSweptSenderAddress · unknown

data. blockHash · unknown

data. blockNumber · unknown

data. blockchain · object

Show child attributes

data.blockchain. createdAt · string

Example:

"2024-05-27T14:31:14.966Z"

data.blockchain. derivationPath · string

Example:

"m/44'/60'/0'/0"

data.blockchain. id · string

Example:

"74733889-4ecd-403e-9840-94e87c043f24"

data.blockchain. isActive · boolean

Example:

true

data.blockchain. isEvmCompatible · boolean

Example:

true

data.blockchain. isL2 · boolean

Example:

true

data.blockchain. name · string

Example:

"base"

data.blockchain. slug · string

Example:

"base"

data.blockchain. symbol · string

Example:

"eth"

data.blockchain. tokenStandard · string | null

Example:

null

data.blockchain. updatedAt · string

Example:

"2024-11-26T20:04:13.945Z"

data. chainId · unknown

data. confirmations · unknown

data. confirmed · boolean

Example:

true

data. createdAt · string

Example:

"2025-08-11T22:21:56.077Z"

data. currency · string

Example:

"USD"

data. fee · unknown

data. feeHash · unknown

data. gasFee · unknown

data. gasPrice · unknown

data. gasUsed · unknown

data. hash · string

Example:

"0x229d811ef34a9f12454e89f12e06945dfc8122538a0af6369ec3f2a2f9aa8cbb"

data. id · string

Example:

"fe2d8c39-a6ba-41cb-99e7-05c4dcee6c94"

data. metadata · unknown

data. network · string

Example:

"testnet"

data. note · unknown

data. rate · unknown

data. rateUSD · string

Example:

"0.00"

data. reason · string

Example:

"{\"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\"}}"

data. recipientAddress · string

Example:

"0x036CbD53842c5426634e7929541eC2318f3dCF7e"

data. reference · string

Example:

"xvLz7CIFoD"

data. senderAddress · string

Example:

"0x947514e4B803e312C312da0F1B41fEDdbe15ae7a"

data. signedTransaction

Example:

"0xf8ab3e83124fc08301623d94036cbd53842c5426634e7929541ec2318f3dcf7e80b844a9059cbb000000000000000000000000451defc27b45808078e875556af06bcfdc697ba400000000000000000000000000000000000000000000000000000000000027108302948ca0c86783ba50374a959907d9174c2a0b5cd3a87d55336e6c9a6420fde0dd07303ea019a93dad742a9bed4c6d1f514f7fe26777e8f17fe090967a9719afddaa281d64"

data. status · string

Example:

"SUCCESS"

data. toAmount · unknown

data. toCurrency · unknown

data. tokenAddress · string

Example:

"0x036CbD53842c5426634e7929541eC2318f3dCF7e"

data. type · string

Example:

"SIGNED"

data. updatedAt · string

Example:

"2025-08-11T22:21:56.077Z"

data. wallet · object

Show child attributes

data.wallet. address · string

Example:

"0x947514e4B803e312C312da0F1B41fEDdbe15ae7a"

data.wallet. configurations · unknown

data.wallet. createdAt · string

Example:

"2024-08-22T16:05:46.167Z"

data.wallet. derivationPath · string

Example:

"m/44'/60'/0'/0/0"

data.wallet. description · string

Example:

"This is Base wallet"

data.wallet. id · string

Example:

"e17dea25-6c01-4b3a-a4ae-51f411bf69cd"

data.wallet. isActive · boolean

Example:

true

data.wallet. name · string

Example:

"Base Wallet"

data.wallet. network · string

Example:

"testnet"

data.wallet. status · string

Example:

"ACTIVE"

data.wallet. updatedAt · string

Example:

"2024-08-22T16:05:46.167Z"

message · string

Example:

"Contract write signed successfully"

statusCode · number

Example:

200