Neutron

tip

Neutron developers make use of external libraries like CosmJS. The following is an explanation of how to initiate a transfer transaction by invoking the method through dapp.request. We recommend utilizing a dedicated library rather than accessing the service directly if you want a greater degree of abstraction than the API provides.

To send a transaction in Neutron network, it needs to be followed the steps below.

1. Detecting of Universal Provider (window.dapp)
2. Detecting the Neutron network to which the user is linked
3. Import the Neutron account of the user

The WELLDONE Wallet finds and imports networks associated with that wallet address. Before submitting a transaction, you should evaluate whether to transmit it to the mainnet or the testnet. The following format can be used to transmit the transaction:

const response = await dapp.request('neutron', {
  method: 'dapp:signAndSendTransaction',
  params: [JSON.stringify(transactionParameters)],

1. Returns

This method returns the transaction hash value as a Promise object of type string because you can send multiple transactions as well as one transaction.

Promise<string[]>;

2. Params

The dapp:signAndSendTransaction method takes the transaction as HEX string type HEX_STRING_TX_DATA. However, Neutron networks can take the transaction parameters as JSON string type.

interface TransactionParameters {
  signerData: {
    accountNumber: string;
    sequence: string;
    chainId: string;
  };
  fee: {
    amount: [
      {
        denom: string;
        amount: string;
      },
    ];
    gas: string;
  };
  memo: string;
  msgs: [
    {
      typeUrl: '/cosmos.bank.v1beta1.MsgSend';
      value: {
        fromAddress: string;
        toAddress: string;
        amount: [{ denom: string; amount: string }];
      };
    },
  ];
  sequence: string;
}

• The value depends on the type of typeUrl and the method of the contract you want to execute. The above parameters are examples of transaction types that send coins to other accounts.

3. Example

const sendTransaction = async () => {
  // get accounts first
  const accounts = await dapp.request('neutron', { method: 'dapp:accounts' });
  const sequence = '10';
  const chainId = 'pion-1';
  const transactionParameters = {
    signerData: {
      accountNumber: accounts['neutron'].address,
      sequence,
      chainId,
    },
    fee: {
      amount: [
        {
          denom: 'untrn',
          amount: '4000',
        },
      ],
      gas: '180000', // 180k
    },
    memo: '',
    msgs: [
      {
        typeUrl: '/cosmos.bank.v1beta1.MsgSend',
        value: {
          fromAddress: accounts['neutron'].address,
          toAddress: accounts['neutron'].address, // send to yourself
          amount: [{ denom: 'untrn', amount: '10000' }],
        },
      },
    ],
    sequence: `${sequence}`,
  };
  // sending a transaction
  try {
    const response = await dapp.request('neutron', {
      method: 'dapp:signAndSendTranssaction',
      params: [JSON.stringify(transactionParameters)],
    });
    const txHash = response[0];
  } catch (error) {
    /* 
      {
        message: 'User denied transaction signature',
        code: 4001,
      }
    */
  }
};

To complete the transaction, follow the steps outlined below. The testnet token is required to transmit a transaction. You can request faucet through the FAUCET tab in the wallet.

Live Editor

function sendTransaction() { const CHAIN_NAME = 'neutron'; const sequence = '10'; const chainId = 'pion-1'; const [accounts, setAccounts] = React.useState(null); const [txHash, setTxHash] = React.useState(null); async function handleGetAccount() { try { const accounts = await dapp.request(CHAIN_NAME, { method: 'dapp:accounts', }); if (Object.keys(accounts).length === 0) { throw new Error('There is no accounts.'); } const status = await dapp.request('neutron', { method: 'status', }); if (status.node_info.network !== 'pion-1') { throw new Error('Please change to Neutron Testnet in WELLDONE Wallet'); } setAccounts(accounts[CHAIN_NAME].address); } catch (error) { alert(error.message); } } async function handleSendTransaction() { try { const transactionParameters = { signerData: { accountNumber: accounts, sequence, chainId, }, fee: { amount: [ { denom: 'untrn', amount: '4000', }, ], gas: '180000', // 180k }, memo: '', msgs: [ { typeUrl: '/cosmos.bank.v1beta1.MsgSend', value: { fromAddress: accounts, toAddress: accounts, // send to yourself amount: [{ denom: 'untrn', amount: '10000' }], }, }, ], sequence: `${sequence}`, }; const response = await dapp.request(CHAIN_NAME, { method: 'dapp:signAndSendTransaction', params: [JSON.stringify(transactionParameters)], }); const txHash = response[0]; setTxHash(txHash); } catch (error) { console.log(error); alert(`Error Message: ${error.message}\nError Code: ${error.code}`); } } return ( <> {accounts ? ( <> <Button onClick={handleSendTransaction} type="button"> Send a Transaction </Button> <ResultTooltip style={{ background: '#3B48DF' }}> <b>Accounts:</b> {accounts} </ResultTooltip> </> ) : ( <> <Button onClick={handleGetAccount} type="button"> Get Account </Button> <div>You have to get account first!</div> </> )} {txHash && ( <ResultTooltip style={{ background: '#F08080' }}> <b>Transaction Hash:</b> {txHash} </ResultTooltip> )} </> ); }

function sendTransaction() {
  const CHAIN_NAME = 'neutron';
  const sequence = '10';
  const chainId = 'pion-1';
  const [accounts, setAccounts] = React.useState(null);
  const [txHash, setTxHash] = React.useState(null);
  async function handleGetAccount() {
    try {
      const accounts = await dapp.request(CHAIN_NAME, {
        method: 'dapp:accounts',
      });
      if (Object.keys(accounts).length === 0) {
        throw new Error('There is no accounts.');
      }
      const status = await dapp.request('neutron', {
        method: 'status',
      });
      if (status.node_info.network !== 'pion-1') {
        throw new Error('Please change to Neutron Testnet in WELLDONE Wallet');
      }
      setAccounts(accounts[CHAIN_NAME].address);
    } catch (error) {
      alert(error.message);
    }
  }
  async function handleSendTransaction() {
    try {
      const transactionParameters = {
        signerData: {
          accountNumber: accounts,
          sequence,
          chainId,
        },
        fee: {
          amount: [
            {
              denom: 'untrn',
              amount: '4000',
            },
          ],
          gas: '180000', // 180k
        },
        memo: '',
        msgs: [
          {
            typeUrl: '/cosmos.bank.v1beta1.MsgSend',
            value: {
              fromAddress: accounts,
              toAddress: accounts, // send to yourself
              amount: [{ denom: 'untrn', amount: '10000' }],
            },
          },
        ],
        sequence: `${sequence}`,
      };

      const response = await dapp.request(CHAIN_NAME, {
        method: 'dapp:signAndSendTransaction',
        params: [JSON.stringify(transactionParameters)],
      });
      const txHash = response[0];

      setTxHash(txHash);
    } catch (error) {
      console.log(error);
      alert(`Error Message: ${error.message}\nError Code: ${error.code}`);
    }
  }
  return (
    <>
      {accounts ? (
        <>
          <Button onClick={handleSendTransaction} type="button">
            Send a Transaction
          </Button>
          <ResultTooltip style={{ background: '#3B48DF' }}>
            <b>Accounts:</b> {accounts}
          </ResultTooltip>
        </>
      ) : (
        <>
          <Button onClick={handleGetAccount} type="button">
            Get Account
          </Button>
          <div>You have to get account first!</div>
        </>
      )}
      {txHash && (
        <ResultTooltip style={{ background: '#F08080' }}>
          <b>Transaction Hash:</b> {txHash}
        </ResultTooltip>
      )}
    </>
  );
}

Result

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