Creating a Gas-less UX: Treasury Contracts

The introduction of treasury contracts enables an OAuth-like authentication flow (fully on-chain), creation of complex allowance systems that provides granular control of allowances to the developer, as well as gas-less experience for the end users. This guide demonstrates how to use the developer portal to deploy your dApp’s first treasury contract.

One treasury contract deployment is meant for a single dApp. Think of it as setting up OAuth for your app (your dApp requests access of data from the Xion chain on behalf of the user, without getting access to private information)

Xion Developer Portal

The portal is available at https://dev.testnet.burnt.com/ 🖥️

Select the Account

On the Dashboard

This is where all your deployed treasury contracts will be visible

Remember: Details of any contract deployed from here is stored in the local storage, so moving between browsers or devices won’t retain the list of treasury contracts deployed by your account.

Click on “New treasury”:

Selecting Config for your dApp

Remember: All the config generated here can be edited and customized - but make sure the keys are always in snake_case and not camelCase

Remember: Feel free to edit the “description” string in configuration objects to appropriate description based the intention behind the request. The user will see this description when they click “Allow” after connecting their account.

Click encode to see what the final config looks like after setting appropriate values for the Fee and Grant configs. Eg.,

Fee Grant config:

Grant config:

After clicking “save config” for both Fee and Grant config, the modal will display two configuration JSON objects under “Treasury Instance Preview”

Once you have confirmed the data here - click “Create”

The contract is going to be displayed under "Treasury Contracts" on the Portal

On the Client (React App)

Upgrade to the latest version of @burnt-labs/abstraxion package in your react application

Copy over the treasury contract address from the dashboard and paste it in AbstraxionProvider component’s config parameter

const config = {
	treasury: `CONTRACT_ADDRESS`,
	// optional (only for mainnet)
	// rpcUrl: ``,
	// restUrl: ``
}

As opposed to instantiating the config in the current format:

Using treasury contracts the config can be setup as:

Note: dApps that are running with legacy config options will continue to run, but the config can’t have both the options: legacy and treasury

Legacy config is deprecated - in future this will be completely removed

The provider is instantiated as:

...
...
...


const treasuryConfig = {
  treasury: "xion17ah4x9te3sttpy2vj5x6hv4xvc0td526nu0msf7mt3kydqj4qs2s9jhe90", // Example XION treasury contract
  // Optional params to activate mainnet config
  // rpcUrl: "https://rpc.xion-mainnet-1.burnt.com:443",
  // restUrl: "https://api.xion-mainnet-1.burnt.com:443",
};

export default function RootLayout({
  children,
}: {
  children: React.ReactNode;
}): JSX.Element {
  return (
    <html lang="en">
      <body className={inter.className}>

	      ...
        ...
        ...

        <AbstraxionProvider config={treasuryConfig}>
          {children}
        </AbstraxionProvider>

        ...
        ...

      </body>
    </html>
  );
}

This changes the redirect url that the user is redirected to after clicking connect and before clicking allow (highlighted in the screenshot below)

On the app, while connecting their accounts, the user will see list of allowances - (this message is set at the time of treasury contracts creation by the dev while setting up the config)

As soon as user clicks allow the dapp creates a Grant & deploys a Fee Grant for the user.

Anywhere that the app does an .execute , make sure the granter is set to the address of the treasury contract in the fee config (4th parameter)

Once changing code to use treasury contracts, you’d have to force logout the users

return client.execute(
    sender,
    contract,
    msg,
    {
      amount: [{ amount: "1", denom: "uxion" }],
      gas: "500000",
      granter: TREASURY.treasury
    },
    "",
    []
  );

Before Testing

Send some uxion to the treasury contract
Test execute on the dApp and confirm if the fee was deducted from the treasury contract’s address instead of the user’s account.

Last updated 1 month ago

Xion Developer Portal

Login to the Portal

Select the Account

On the Dashboard

Selecting Config for your dApp

On the Client (React App)

Before Testing

Xion Developer Portal

Login to the Portal

Select the Account

On the Dashboard

Selecting Config for your dApp

On the Client (React App)

Before Testing