> ## Documentation Index
> Fetch the complete documentation index at: https://developers.circle.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Quickstart: Interact With a Smart Contract
In this guide, we will interact with a deployed smart contract using APIs. If
you haven't deployed a smart contract, follow the
[deploy a smart contract](/contracts/scp-deploy-smart-contract) tutorial.
## 1. Retrieve the Smart Contract's Functions
To fetch the new Contract object, make a `GET /contracts/{id}` request that
includes the `contractId` object returned from your deployment request. The
`functions` property returned in the successful request contains a list of all
of the functions on the contract:
```javascript Node.js SDK theme={null}
// Import and configure the developer-controlled wallet SDK
const {
initiateDeveloperControlledWalletsClient,
} = require("@circle-fin/developer-controlled-wallets");
const circleDeveloperSdk = initiateDeveloperControlledWalletsClient({
apiKey: "",
entitySecret: "",
});
// Import and configure the smart contract SDK
const {
initiateSmartContractPlatformClient,
} = require("@circle-fin/smart-contract-platform");
const circleContractSdk = initiateSmartContractPlatformClient({
apiKey: "",
entitySecret: "",
});
const response = await circleContractSdk.getContract({
id: "0189db84-72b7-7fcc-832b-5bf886b9a0ef",
});
```
```coffeescript Python SDK theme={null}
from circle.web3 import smart_contract_platform, developer_controlled_wallets
from circle.web3 import utils
# Import and configure the developer-controlled wallet SDK
client = utils.init_developer_controlled_wallets_client(api_key=key, entity_secret=entitySecret)
# Import and configure the smart contract SDK
scpClient = utils.init_smart_contract_platform_client(api_key=key, entity_secret=entitySecret)
# create an api instance
api_instance = smart_contract_platform.ViewUpdateApi(scpClient)
try:
response = api_instance.get_contract(id='0189db84-72b7-7fcc-832b-5bf886b9a0ef')
print(response)
except smart_contract_platform.ApiException as e:
print("Exception when calling ViewUpdateApi->get_contract: %s\n" % e)
```
```curl cURL theme={null}
curl --request GET \
--url 'https://api.circle.com/v1/w3s/contracts/{id}' \
--header 'accept: application/json' \
--header 'authorization: Bearer '
```
```json JSON theme={null}
{
"data": {
"contract": {
"id": "0189db84-72b7-7fcc-832b-5bf886b9a0ef",
"entityId": "dcfa8149-98d8-4ed4-91fb-de7f3627b384",
"deploymentTransactionId": "4f5bfa38-c598-56a6-932e-8b5bbd3d5fc9",
"name": "First Contract Name",
"description": "First Contract Description",
"contractInputType": "BYTECODE",
"createDate": "2023-08-09T18:17:17Z",
"updateDate": "2023-08-09T18:17:17Z",
"archived": false,
"contractAddress": "0x1e124d7384cd34448ea5907bd0052a79355ab5eb",
"blockchain": "MATIC-AMOY",
"status": "COMPLETE",
"deployerAddress": "0x1bf9ad0cc2ad298c69a2995aa806ee832788218c",
"txHash": "0x241c4df6f08f9ed2b569c9f9b1cc48fb6074ffffaeee7552e716ce059161a743",
"abiJson": "[\n\t{\n\t\t\"inputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"constructor\"\n\t},\n\t{\n\t\t\"anonymous\": false,\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"owner\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"approved\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"Approval\",\n\t\t\"type\": \"event\"\n\t},\n\t{\n\t\t\"anonymous\": false,\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"owner\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"operator\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"indexed\": false,\n\t\t\t\t\"internalType\": \"bool\",\n\t\t\t\t\"name\": \"approved\",\n\t\t\t\t\"type\": \"bool\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"ApprovalForAll\",\n\t\t\"type\": \"event\"\n\t},\n\t{\n\t\t\"anonymous\": false,\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"previousOwner\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"newOwner\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"OwnershipTransferred\",\n\t\t\"type\": \"event\"\n\t},\n\t{\n\t\t\"anonymous\": false,\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"from\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"to\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"indexed\": true,\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"Transfer\",\n\t\t\"type\": \"event\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"to\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"approve\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"owner\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"balanceOf\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"getApproved\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"owner\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"operator\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"isApprovedForAll\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"bool\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"bool\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [],\n\t\t\"name\": \"name\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"string\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"string\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [],\n\t\t\"name\": \"owner\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"ownerOf\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [],\n\t\t\"name\": \"renounceOwnership\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"to\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"safeMint\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"from\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"to\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"safeTransferFrom\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"from\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"to\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"bytes\",\n\t\t\t\t\"name\": \"data\",\n\t\t\t\t\"type\": \"bytes\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"safeTransferFrom\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"operator\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"bool\",\n\t\t\t\t\"name\": \"approved\",\n\t\t\t\t\"type\": \"bool\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"setApprovalForAll\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"bytes4\",\n\t\t\t\t\"name\": \"interfaceId\",\n\t\t\t\t\"type\": \"bytes4\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"supportsInterface\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"bool\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"bool\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [],\n\t\t\"name\": \"symbol\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"string\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"string\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"tokenURI\",\n\t\t\"outputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"string\",\n\t\t\t\t\"name\": \"\",\n\t\t\t\t\"type\": \"string\"\n\t\t\t}\n\t\t],\n\t\t\"stateMutability\": \"view\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"from\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"to\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t},\n\t\t\t{\n\t\t\t\t\"internalType\": \"uint256\",\n\t\t\t\t\"name\": \"tokenId\",\n\t\t\t\t\"type\": \"uint256\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"transferFrom\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t},\n\t{\n\t\t\"inputs\": [\n\t\t\t{\n\t\t\t\t\"internalType\": \"address\",\n\t\t\t\t\"name\": \"newOwner\",\n\t\t\t\t\"type\": \"address\"\n\t\t\t}\n\t\t],\n\t\t\"name\": \"transferOwnership\",\n\t\t\"outputs\": [],\n\t\t\"stateMutability\": \"nonpayable\",\n\t\t\"type\": \"function\"\n\t}\n]",
"functions": [
{
"name": "approve",
"type": "function",
"inputs": [
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"stateMutability": "nonpayable"
},
{
"name": "balanceOf",
"type": "function",
"inputs": [
{
"name": "owner",
"type": "address"
}
],
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "uint256"
}
]
},
{
"name": "getApproved",
"type": "function",
"inputs": [
{
"name": "tokenId",
"type": "uint256"
}
],
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "address"
}
]
},
{
"name": "isApprovedForAll",
"type": "function",
"inputs": [
{
"name": "owner",
"type": "address"
},
{
"name": "operator",
"type": "address"
}
],
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "bool"
}
]
},
{
"name": "name",
"type": "function",
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "string"
}
]
},
{
"name": "owner",
"type": "function",
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "address"
}
]
},
{
"name": "ownerOf",
"type": "function",
"inputs": [
{
"name": "tokenId",
"type": "uint256"
}
],
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "address"
}
]
},
{
"name": "renounceOwnership",
"type": "function",
"stateMutability": "nonpayable"
},
{
"name": "safeMint",
"type": "function",
"inputs": [
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"stateMutability": "nonpayable"
},
{
"name": "safeTransferFrom",
"type": "function",
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"stateMutability": "nonpayable"
},
{
"name": "safeTransferFrom",
"type": "function",
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
},
{
"name": "data",
"type": "bytes"
}
],
"stateMutability": "nonpayable"
},
{
"name": "setApprovalForAll",
"type": "function",
"inputs": [
{
"name": "operator",
"type": "address"
},
{
"name": "approved",
"type": "bool"
}
],
"stateMutability": "nonpayable"
},
{
"name": "supportsInterface",
"type": "function",
"inputs": [
{
"name": "interfaceId",
"type": "bytes4"
}
],
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "bool"
}
]
},
{
"name": "symbol",
"type": "function",
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "string"
}
]
},
{
"name": "tokenURI",
"type": "function",
"inputs": [
{
"name": "tokenId",
"type": "uint256"
}
],
"stateMutability": "view",
"outputs": [
{
"name": "",
"type": "string"
}
]
},
{
"name": "transferFrom",
"type": "function",
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"stateMutability": "nonpayable"
},
{
"name": "transferOwnership",
"type": "function",
"inputs": [
{
"name": "newOwner",
"type": "address"
}
],
"stateMutability": "nonpayable"
}
],
"events": [
{
"name": "Approval",
"type": "event",
"inputs": [
{
"name": "owner",
"type": "address",
"indexed": true
},
{
"name": "approved",
"type": "address",
"indexed": true
},
{
"name": "tokenId",
"type": "uint256",
"indexed": true
}
],
"anonymous": false
},
{
"name": "ApprovalForAll",
"type": "event",
"inputs": [
{
"name": "owner",
"type": "address",
"indexed": true
},
{
"name": "operator",
"type": "address",
"indexed": true
},
{
"name": "approved",
"type": "bool",
"indexed": false
}
],
"anonymous": false
},
{
"name": "OwnershipTransferred",
"type": "event",
"inputs": [
{
"name": "previousOwner",
"type": "address",
"indexed": true
},
{
"name": "newOwner",
"type": "address",
"indexed": true
}
],
"anonymous": false
},
{
"name": "Transfer",
"type": "event",
"inputs": [
{
"name": "from",
"type": "address",
"indexed": true
},
{
"name": "to",
"type": "address",
"indexed": true
},
{
"name": "tokenId",
"type": "uint256",
"indexed": true
}
],
"anonymous": false
}
],
"verificationStatus": "UNVERIFIED"
}
}
```
**Note:** Smart contract functions are defined using the Application Binary
Interface (ABI). Some important ABI properties are:
1. `name`: The function name. This is used in the `abiFunctionSignature` to
select which function to call when reading from or executing a function on a
smart contract.
2. `inputs`: The names and types of the arguments to the function. These
parameters are passed to the `contracts/read` or
`developer/transactions/contractExecution` APIs via the `abiParameters`
property.
3. `outputs`: The output values when the function returns. Some functions do not
return anything.
4. `stateMutability`: Defines how the function interacts with the blockchain.
1. `view` and `pure` functions do not change the state of the blockchain, so
these are `read` functions.
2. `nonpayable` and `payable` functions update the state of the blockchain,
so these are `execute` functions. `nonpayable` is the default for a
function if no `stateMutability` property exists.
## 2. Contract Query Function
Once you have selected a read function from the list, you can send an API
request to `POST /contracts/query`. The example below is making a request to the
`owner()` function to check the current owner of the contract
**Notes:**
* The `abiFunctionSignature` is derived from the function name and the
parenthesized list of parameter types. For instance, the
`abiFunctionSignature` for a function named `testFunction` that takes an
`address` and an `uint256` would be `testFunction(address,uint256)`.
* Read interactions *do not* require gas on the blockchain, so you are not
required to a specify a wallet.
* A shortened `abiJson`, containing only the part of the ABI describing the
`owner` function of the contract, was used to demonstrate, but ordinarily, the
entire ABI would be included in the request.
```javascript Node.js SDK theme={null}
response = await client.queryContract({
abiFunctionSignature: "owner()",
address: "0x1e124d7384cd34448ea5907bd0052a79355ab5eb",
blockchain: "MATIC-AMOY",
abiJson:
'[{"inputs": [],"name": "owner","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"}]',
});
```
```coffeescript Python SDK theme={null}
# create an api instance
api_instance = smart_contract_platform.InteractApi(scpClient)
try:
request = smart_contract_platform.ReadContractStateRequest.from_dict({
"abiFunctionSignature": "owner()",
"address": "0x1e124d7384cd34448ea5907bd0052a79355ab5eb",
"blockchain": "MATIC-AMOY",
"abiJson": "[{\"inputs\": [],\"name\": \"owner\",\"outputs\": [{\"internalType\": \"address\",\"name\": \"\",\"type\": \"address\"}],\"stateMutability\": \"view\",\"type\": \"function\"}]"
})
response = api_instance.query_contract(request)
except smart_contract_platform.ApiException as e:
print("Exception when calling InteractApi->read_contract: %s\n" % e)
```
```curl Bash theme={null}
curl --request POST \
--url https://api.circle.com/v1/w3s/contracts/query \
--header "Authorization: Bearer $API_KEY" \
--header 'accept: application/json' \
--header 'content-type: application/json' \
--data '{
"abiFunctionSignature": "owner()",
"address": "0x1e124d7384cd34448ea5907bd0052a79355ab5eb",
"blockchain": "MATIC-AMOY",
"abiJson": "[{\"inputs\": [],\"name\": \"owner\",\"outputs\": [{\"internalType\": \"address\",\"name\": \"\",\"type\": \"address\"}],\"stateMutability\": \"view\",\"type\": \"function\"}]"
}'
```
```json Response Body theme={null}
{
"data": {
"outputData": "0x000000000000000000000000D4D2DB6B4e42Db2c2C0797F009942b35e466DB29",
"outputValues": ["0xD4D2DB6B4e42Db2c2C0797F009942b35e466DB29"]
}
}
```
## 3. Contract Execution Function
Once you have chosen an execute function you can make a request to
`POST developer/transactions/contractExecution` or
`user/transactions/contractExecution`, for developer-controlled and
user-controlled wallets, respectively. The example below uses the
developer-controlled endpoint to call the `safeMint()` function to mint an NFT.
The function takes in two parameters: the `to` address and the assigned
`tokenId` for the NFT. The `abiFunctionSignature` is
`safeMint(address, uint256)`.
* **Note:** The `safeMint` function must be called by the `owner` of the
contract. We specified this function modifier when generating the contract
earlier.
* **Note:** Write functions *do* require gas on the blockchain, so a `walletId`
must be specified in the request.
```javascript Node.js SDK theme={null}
const response = await circleDeveloperSdk.createContractExecutionTransaction({
walletId: "ce714f5b-0d8e-4062-9454-61aa1154869b",
contractAddress: "0x2f3A40A3db8a7e3D09B0adfEfbCe4f6F81927557",
abiFunctionSignature: "safeMint(address, uint256)",
abiParameters: ["0x6E5eAf34c73D1CD0be4e24f923b97CF38e10d1f3", 1],
fee: {
type: "level",
config: {
feeLevel: "MEDIUM",
},
},
});
```
```coffeescript Python SDK theme={null}
# create an api instance
api_instance = developer_controlled_wallets.TransactionsApi(client)
try:
request = developer_controlled_wallets.CreateContractExecutionTransactionForDeveloperRequest.from_dict({
"walletId": 'ce714f5b-0d8e-4062-9454-61aa1154869b',
"contractAddress": '0x2f3A40A3db8a7e3D09B0adfEfbCe4f6F81927557',
"abiFunctionSignature": 'safeMint(address, uint256)',
"abiParameters": ['0x6E5eAf34c73D1CD0be4e24f923b97CF38e10d1f3', 1],
"feeLevel": 'MEDIUM'
})
response = api_instance.create_developer_transaction_contract_execution(request)
print(response)
except developer_controlled_wallets.ApiException as e:
print("Exception when calling TransactionsApi->create_developer_transaction_contract_execution: %s\n" % e)
```
```curl Bash theme={null}
curl --request POST \
--url 'https://api.circle.com/v1/w3s/developer/transactions/contractExecution' \
--header 'accept: application/json' \
--header 'content-type: application/json' \
--header 'authorization: Bearer ' \
--data '
{
"idempotencyKey": "d6d56c67-9d8b-4e87-a618-1c44fa04a495",
"walletId": "ce714f5b-0d8e-4062-9454-61aa1154869b",
"contractAddress": "0x1e124d7384cd34448ea5907bd0052a79355ab5eb",
"abiFunctionSignature": "safeMint(address, uint256)",
"abiParameters": [
"0x6E5eAf34c73D1CD0be4e24f923b97CF38e10d1f3",
1
],
"feeLevel": "MEDIUM",
"entitySecretCiphertext": "N8sYP20DJvujfnlSM4qirGXGN8Pr+FjgMWN7zHc96EiSJnPxoGviniZlNaLT..."
}
```
```json Response Body theme={null}
{
"data": {
"transactionId": "84cb1754-f236-4bfc-8562-70fa6ee168c8"
}
}
```