LSP28 The Grid Skill

Manage LSP28 The Grid on Universal Profiles. Create grid layouts with mini-apps, iframes, and external links.

Quick Start

1. Configure Environment

Set these environment variables or edit the scripts:

export UP_PRIVATE_KEY="your_controller_private_key"
export UP_ADDRESS="your_universal_profile_address"
export KEY_MANAGER="your_key_manager_address"

2. Update Grid Layout

const { ethers } = require('ethers');

// Grid data structure
const gridData = {
  isEditable: true,
  items: [
    {
      type: 'miniapp',
      id: 'app1',
      title: 'My App',
      backgroundColor: '#1a1a2e',
      textColor: '#ffffff',
      text: 'Click me'
    },
    {
      type: 'iframe',
      src: 'https://example.com/embed',
      id: 'frame1',
      title: 'External Content'
    },
    {
      type: 'external',
      url: 'https://example.com',
      id: 'link1',
      title: 'Visit Site'
    }
  ]
};

// Encode as VerifiableURI
const jsonString = JSON.stringify(gridData);
const base64Data = Buffer.from(jsonString).toString('base64');
const verifiableUri = `data:application/json;base64,${base64Data}`;

3. Execute Transaction

// LSP28 Grid data key
const LSP28_GRID_KEY = '0x31cf14955c5b0052c1491ec06644438ec7c14454be5eb6cb9ce4e4edef647423';

// Minimal ABIs
const LSP0_ABI = ['function setData(bytes32 dataKey, bytes dataValue) external'];
const LSP6_ABI = ['function execute(bytes calldata payload) external payable returns (bytes memory)'];

// Setup provider and wallet
const provider = new ethers.JsonRpcProvider('https://rpc.mainnet.lukso.network');
const wallet = new ethers.Wallet(process.env.UP_PRIVATE_KEY, provider);

// Encode setData call on UP
const upInterface = new ethers.Interface(LSP0_ABI);
const executeData = upInterface.encodeFunctionData('setData', [
  LSP28_GRID_KEY,
  ethers.toUtf8Bytes(verifiableUri)
]);

// Send via KeyManager
const keyManager = new ethers.Contract(process.env.KEY_MANAGER, LSP6_ABI, wallet);
const tx = await keyManager.execute(executeData);
const receipt = await tx.wait();
console.log('Grid updated in block:', receipt.blockNumber);

Data Structure Reference

Grid Item Types

Mini-App (type: 'miniapp')

{
  type: 'miniapp',
  id: 'unique-id',          // Required: unique identifier
  title: 'App Title',       // Required: display title
  text: 'Button text',      // Required: button label
  backgroundColor: '#fe005b',  // Required: hex color
  textColor: '#ffffff',     // Required: hex color for text
  size: 'medium'            // Optional: 'small', 'medium', 'large'
}

IFrame (type: 'iframe')

{
  type: 'iframe',
  id: 'unique-id',          // Required: unique identifier
  title: 'Frame Title',     // Required: display title
  src: 'https://example.com/embed'  // Required: iframe URL
}

External Link (type: 'external')

{
  type: 'external',
  id: 'unique-id',          // Required: unique identifier
  title: 'Link Title',      // Required: display title
  url: 'https://example.com'  // Required: external URL
}

Full Grid Structure

{
  isEditable: true,  // Boolean: allows editing
  items: [
    // Array of grid items (see types above)
  ]
}

Important Constants

Constant	Value	Description
LSP28_GRID_KEY	0x31cf14955c5b0052c1491ec06644438ec7c14454be5eb6cb9ce4e4edef647423	Data key for grid storage
Chain ID	42	LUKSO Mainnet
RPC URL	https://rpc.mainnet.lukso.network	Public RPC endpoint

Color Contrast Requirements

Ensure text is readable on background colors:

Background	Text Color	Result
#1a1a2e (dark)	#ffffff (white)	Good contrast
#ffffff (white)	#000000 (black)	Good contrast
#fe005b (pink)	#ffffff (white)	Good contrast
#000000 (black)	#fe005b (pink)	Good contrast

Common Mistakes

❌ Wrong property names:

// WRONG:
{ color: '#fe005b', content: 'Click me' }

// CORRECT:
{ backgroundColor: '#fe005b', text: 'Click me' }

❌ Missing required fields:

• All items need: type, id, title
• Mini-apps additionally need: text, backgroundColor, textColor

❌ Wrong encoding:

// WRONG - toUtf8String instead of toUtf8Bytes:
setData(key, ethers.toUtf8String(uri))

// CORRECT:
setData(key, ethers.toUtf8Bytes(uri))

Transaction Flow

Controller Key 
    ↓
KeyManager.execute(payload)
    ↓
UP.setData(LSP28_GRID_KEY, verifiableUri)
    ↓
Grid updated on-chain

CLI Usage

Use the provided script:

# Use example grid
node scripts/update-grid.js --example

# Load from JSON file
node scripts/update-grid.js --file my-grid.json

References

• references/lsp28-spec.md - Full LSP28 specification
• scripts/update-grid.js - Complete working example
• LSP28 Standard: https://github.com/lukso-network/LIPs/blob/main/LSPs/LSP-28-TheGrid.md