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Hedera Smart Contract Service APIs

hscs/createSmartContract

How to call the API from an app

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

type SmartContractFunctionParameter = {
    type: 'string' | 'bytes' | 'boolean' | 'int' | 'uint';
    value: string | number | boolean | Uint8Array;
}

const createTokenAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/createSmartContract',
        params: {
          network: 'testnet',
          gas: 100000,
          bytecode: "6080604052...0008190033",
          initialBalance?, // Optional param - type: number
          adminKey?, // Optional param - type: string
          constructorParameters?: // Optional param - type: SmartContractFunctionParameter[]
          contractMemo?, // Optional param - type: string
          stakedNodeId?, // Optional param - type: number
          stakedAccountId?, // Optional param - type: string
          declineStakingReward?, // Optional param - type: boolean
          autoRenewPeriod?, // Optional param - type: number
          maxAutomaticTokenAssociations?, // Optional param - type: number
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

If you don't pass in adminKey,you will not be able modify the contract fields

What the API does

Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "0.0.4409710",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 358240,
            "expirationTime": "Thu, 25 Apr 2024 19:00:00 GMT",
            "exchangeRateInCents": 11.941333333333333
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}

Live Demo on CodePen

hscs/updateSmartContract

How to call the API from an app

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

If you had not created your smart contract setting the adminKey,you will not be able to update your smart contract

What the API does

Parses the arguments that were passed such as the contractid, adminKey, etc.
Returns the transaction receipt as response

An example response:

Live Demo on CodePen

hscs/deleteSmartContract

How to call the API from an app

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const deleteSmartContractAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/deleteSmartContract',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710',
          transferAccountId?, // Optional param - type: string
          transferContractId?, // Optional param - type: string
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

If you had not created your smart contract setting the adminKey,you will not be able to delete your smart contract

What the API does

Parses the arguments that were passed such as the contractid, transferAccountId, transferContractId, etc.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "0.0.4409710",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 358240,
            "expirationTime": "Tue, 04 Jun 2024 16:00:00 GMT",
            "exchangeRateInCents": 11.941333333333333
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}

Live Demo on CodePen

hscs/callSmartContractFunction

How to call the API from an app

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

type SmartContractFunctionParameter = {
    type: 'string' | 'bytes' | 'boolean' | 'int' | 'uint';
    value: string | number | boolean | Uint8Array;
}

const callSmartContractFunctionAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/callSmartContractFunction',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710',
          functionName: 'setGreeting',
          functionParams?, // Optional param - type: SmartContractFunctionParameter[]
          gas?, // Optional param - type: number
          senderAccountId?: // Optional param - type: string
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

The call can use at maximum the given amount of gas – the paying account will not be charged for any unspent gas.

What the API does

Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "0.0.4409710",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 358240,
            "expirationTime": "Tue, 04 Jun 2024 16:00:00 GMT",
            "exchangeRateInCents": 11.941333333333333
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}

Live Demo on CodePen

hscs/getSmartContractFunction

How to call the API from an app

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

The call can use at maximum the given amount of gas – the paying account will not be charged for any unspent gas.

What the API does

Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Returns the transaction receipt as response

An example response:

Live Demo on CodePen

hscs/getSmartContractBytecode

How to call the API from an app

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const getSmartContractBytecodeAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/getSmartContractBytecode',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710'
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

What the API does

Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "bytecode": "608060405234.....6c634300080b0033"
}

Live Demo on CodePen

hscs/getSmartContractInfo

How to call the API from an app

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const getSmartContractInfoAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/getSmartContractInfo',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710'
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

What the API does

Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "info": {
        "contractId": "0.0.4409710",
        "accountId": "0.0.4409710",
        "contractAccountId": "0ca39034793f026127bcfb651b85515394fd21b1",
        "adminKey": "03d5f871cfe7134c67799dc6df75cdfc4b3f4fd797442350297efa9483661916d2",
        "expirationTime": "Mon, 02 Sep 2024 14:57:53 GMT",
        "autoRenewPeriod": 7776000,
        "autoRenewAccountId": "",
        "storage": 128,
        "contractMemo": "updating contract on June 4 2024",
        "balance": 0,
        "isDeleted": false,
        "tokenRelationships": {},
        "ledgerId": "testnet",
        "stakingInfo": {
          "declineStakingReward": false,
          "stakePeriodStart": null,
          "pendingReward": "0 tℏ",
          "stakedToMe": "0 tℏ",
          "stakedAccountId": null,
          "stakedNodeId": null
        }
    }
}

Live Demo on CodePen

hscs/deleteSmartContract

How to call the API from an app

Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this .

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const deleteSmartContractAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/deleteSmartContract',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710',
          transferAccountId?, // Optional param - type: string
          transferContractId?, // Optional param - type: string
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

If you had not created your smart contract setting the adminKey,you will not be able to delete your smart contract

What the API does

Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new is created and the account info is saved in snap state.
Parses the arguments that were passed such as the contractid, transferAccountId, transferContractId, etc.
Calls the to delete a smart contract from the Hedera network. Once a smart contract is marked deleted, you will not be able to modify any of the contract's properties.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "0.0.4409710",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 358240,
            "expirationTime": "Tue, 04 Jun 2024 16:00:00 GMT",
            "exchangeRateInCents": 11.941333333333333
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}

Live Demo on CodePen

Note: Visit to activate your hedera account before you interact with the demo
If you're getting any errors with the live demo, make sure you go through the section to learn about what you may be missing. You need to install in your browser for the live demo to work.
To ease the integration of Hedera Wallet Snap on an application, we have created a template web application that you can run locally and check out the code in its entirety to learn how you can integrate and interact with various APIs exposed by Hedera Wallet Snap. Check out the full source code at .
You can also check out the to learn how each API works.

hscs/getSmartContractFunction

How to call the API from an app

Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this .

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

type SmartContractFunctionParameter = {
    type: 'string' | 'bytes' | 'boolean' | 'int' | 'uint';
    value: string | number | boolean | Uint8Array;
}

const getSmartContractFunctionAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/getSmartContractFunction',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710',
          functionName: 'getGreeting',
          functionParams?, // Optional param - type: SmartContractFunctionParameter[]
          gas?, // Optional param - type: number
          senderAccountId?: // Optional param - type: string
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

The call can use at maximum the given amount of gas – the paying account will not be charged for any unspent gas.

What the API does

Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new is created and the account info is saved in snap state.
Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Calls the to query a function of the given smart contract instance, giving it function parameters as its inputs. This is performed locally on the particular node that the client is communicating with. It cannot change the state of the contract instance.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "result": {
        "contractId": "0.0.4409710",
        "bytes": "000000000000000000000000000000000000000000000000000000000000d903",
        "bloom": "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
        "gasUsed": 800000,
        "errorMessage": "",
        "logs": "",
        "signerNonce": null,
        "evmAddress": "",
        "gas": -1,
        "amount": -1,
        "contractNonces": ""
    }
}

Live Demo on CodePen

Note: Visit to activate your hedera account before you interact with the demo
If you're getting any errors with the live demo, make sure you go through the section to learn about what you may be missing. You need to install in your browser for the live demo to work.
To ease the integration of Hedera Wallet Snap on an application, we have created a template web application that you can run locally and check out the code in its entirety to learn how you can integrate and interact with various APIs exposed by Hedera Wallet Snap. Check out the full source code at .
You can also check out the to learn how each API works.

hscs/callSmartContractFunction

How to call the API from an app

Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this .

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

type SmartContractFunctionParameter = {
    type: 'string' | 'bytes' | 'boolean' | 'int' | 'uint';
    value: string | number | boolean | Uint8Array;
}

const callSmartContractFunctionAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/callSmartContractFunction',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710',
          functionName: 'setGreeting',
          functionParams?, // Optional param - type: SmartContractFunctionParameter[]
          gas?, // Optional param - type: number
          senderAccountId?: // Optional param - type: string
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

The call can use at maximum the given amount of gas – the paying account will not be charged for any unspent gas.

What the API does

Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new is created and the account info is saved in snap state.
Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Calls the to call a function of the given smart contract instance, giving it functionParameters as its input.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "0.0.4409710",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 358240,
            "expirationTime": "Tue, 04 Jun 2024 16:00:00 GMT",
            "exchangeRateInCents": 11.941333333333333
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}

Live Demo on CodePen

Note: Visit to activate your hedera account before you interact with the demo
If you're getting any errors with the live demo, make sure you go through the section to learn about what you may be missing. You need to install in your browser for the live demo to work.
To ease the integration of Hedera Wallet Snap on an application, we have created a template web application that you can run locally and check out the code in its entirety to learn how you can integrate and interact with various APIs exposed by Hedera Wallet Snap. Check out the full source code at .
You can also check out the to learn how each API works.

hscs/createSmartContract

How to call the API from an app

Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this .

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

type SmartContractFunctionParameter = {
    type: 'string' | 'bytes' | 'boolean' | 'int' | 'uint';
    value: string | number | boolean | Uint8Array;
}

const createTokenAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/createSmartContract',
        params: {
          network: 'testnet',
          gas: 100000,
          bytecode: "6080604052...0008190033",
          initialBalance?, // Optional param - type: number
          adminKey?, // Optional param - type: string
          constructorParameters?: // Optional param - type: SmartContractFunctionParameter[]
          contractMemo?, // Optional param - type: string
          stakedNodeId?, // Optional param - type: number
          stakedAccountId?, // Optional param - type: string
          declineStakingReward?, // Optional param - type: boolean
          autoRenewPeriod?, // Optional param - type: number
          maxAutomaticTokenAssociations?, // Optional param - type: number
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

If you don't pass in adminKey,you will not be able modify the contract fields

What the API does

Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new is created and the account info is saved in snap state.
Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Calls the to create a new smart contract instance. This API uses ContractCreateFlow() API to create the file storing the bytecode and contract in a single step so you do not need to do anything other than compile your Solidity code and pass the bytecode to the API. The constructor will be executed using the given amount of gas, and any unspent gas will be refunded to the paying account.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "0.0.4409710",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 358240,
            "expirationTime": "Thu, 25 Apr 2024 19:00:00 GMT",
            "exchangeRateInCents": 11.941333333333333
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}

Live Demo on CodePen

Note: Visit to activate your hedera account before you interact with the demo
If you're getting any errors with the live demo, make sure you go through the section to learn about what you may be missing. You need to install in your browser for the live demo to work.
To ease the integration of Hedera Wallet Snap on an application, we have created a template web application that you can run locally and check out the code in its entirety to learn how you can integrate and interact with various APIs exposed by Hedera Wallet Snap. Check out the full source code at .
You can also check out the to learn how each API works.

hscs/updateSmartContract

How to call the API from an app

Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this .

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const updateSmartContractAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/updateSmartContract',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710',
          adminKey?, // Optional param - type: string
          contractMemo?, // Optional param - type: string
          expirationTime?, // Optional param - type: string
          maxAutomaticTokenAssociations?, // Optional param - type: number
          stakedAccountId?, // Optional param - type: string
          stakedNodeId?, // Optional param - type: number
          declineStakingReward?, // Optional param - type: boolean
          autoRenewPeriod?, // Optional param - type: number
          autoRenewAccountId?, // Optional param - type: string
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

If you had not created your smart contract setting the adminKey,you will not be able to update your smart contract

What the API does

Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new is created and the account info is saved in snap state.
Parses the arguments that were passed such as the contractid, adminKey, etc.
Calls the to modify the smart contract entity state like admin keys, proxy account, auto-renew period, and memo.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "0.0.4409710",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 358240,
            "expirationTime": "Tue, 04 Jun 2024 16:00:00 GMT",
            "exchangeRateInCents": 11.941333333333333
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}

Live Demo on CodePen

Note: Visit to activate your hedera account before you interact with the demo
If you're getting any errors with the live demo, make sure you go through the section to learn about what you may be missing. You need to install in your browser for the live demo to work.
To ease the integration of Hedera Wallet Snap on an application, we have created a template web application that you can run locally and check out the code in its entirety to learn how you can integrate and interact with various APIs exposed by Hedera Wallet Snap. Check out the full source code at .
You can also check out the to learn how each API works.

hscs/getSmartContractInfo

How to call the API from an app

Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this .

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const getSmartContractInfoAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/getSmartContractInfo',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710'
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

What the API does

Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new is created and the account info is saved in snap state.
Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Calls the to query the network that returns the current state of a smart contract instance, including its balance.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "info": {
        "contractId": "0.0.4409710",
        "accountId": "0.0.4409710",
        "contractAccountId": "0ca39034793f026127bcfb651b85515394fd21b1",
        "adminKey": "03d5f871cfe7134c67799dc6df75cdfc4b3f4fd797442350297efa9483661916d2",
        "expirationTime": "Mon, 02 Sep 2024 14:57:53 GMT",
        "autoRenewPeriod": 7776000,
        "autoRenewAccountId": "",
        "storage": 128,
        "contractMemo": "updating contract on June 4 2024",
        "balance": 0,
        "isDeleted": false,
        "tokenRelationships": {},
        "ledgerId": "testnet",
        "stakingInfo": {
          "declineStakingReward": false,
          "stakePeriodStart": null,
          "pendingReward": "0 tℏ",
          "stakedToMe": "0 tℏ",
          "stakedAccountId": null,
          "stakedNodeId": null
        }
    }
}

Live Demo on CodePen

Note: Visit to activate your hedera account before you interact with the demo
If you're getting any errors with the live demo, make sure you go through the section to learn about what you may be missing. You need to install in your browser for the live demo to work.
To ease the integration of Hedera Wallet Snap on an application, we have created a template web application that you can run locally and check out the code in its entirety to learn how you can integrate and interact with various APIs exposed by Hedera Wallet Snap. Check out the full source code at .
You can also check out the to learn how each API works.

hscs/getSmartContractBytecode

How to call the API from an app

Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this .

Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const getSmartContractBytecodeAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hscs/getSmartContractBytecode',
        params: {
          network: 'testnet',
          contractId: '0.0.4409710'
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

What the API does

Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new is created and the account info is saved in snap state.
Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Calls the to query the network that returns the bytecode for a smart contract instance.
Returns the transaction receipt as response

An example response:

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 104.67332072,
            "timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
            "tokens": {}
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "bytecode": "608060405234.....6c634300080b0033"
}

Live Demo on CodePen

Note: Visit to activate your hedera account before you interact with the demo
If you're getting any errors with the live demo, make sure you go through the section to learn about what you may be missing. You need to install in your browser for the live demo to work.
To ease the integration of Hedera Wallet Snap on an application, we have created a template web application that you can run locally and check out the code in its entirety to learn how you can integrate and interact with various APIs exposed by Hedera Wallet Snap. Check out the full source code at .
You can also check out the to learn how each API works.