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What You’ll Need

  • MetaMask or any Web3 wallet
  • USDC on Base network (minimum 1 USDC)
  • Your ad creative (image URL and landing page)
Don’t have USDC on Base? Bridge from Ethereum using Base Bridge

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Step 1: Connect Your Wallet

  1. Go to x402 Ad Marketplace
  2. Click “Connect Wallet” in the top right
  3. Choose MetaMask (or your preferred wallet)
  4. Approve the connection
The marketplace only works on Base network. You’ll be prompted to switch if you’re on a different network.

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Step 2: Browse Available Sites

Scroll through the available sites or use the “Available Sites” tab. Each site shows:
  • Site name and URL
  • Monthly visitors
  • Traffic by country
  • Available ad formats
  • Hourly pricing
Click “View Details” on any site to see more information.

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Step 3: Choose Your Ad Format

Select one of three ad formats:

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Step 4: Select Time & Duration

Use the calendar to pick:
  1. Start date - When your ad goes live
  2. Start time - Hour to start (shown in your timezone)
  3. Duration - How many hours to run (1-168 hours)
The calendar shows:
  • ✅ Green = Available slots
  • 🔴 Red = Already booked
  • ⚪ Gray = Past time
Minimum booking: 1 hour. Maximum: 7 days (168 hours)

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Step 5: Upload Your Ad

Provide your ad details: 
{
  "imageUrl": "https://yourdomain.com/ad-banner.png",  // Required
  "linkUrl": "https://yourdomain.com/landing-page",    // Required
  "altText": "Your tagline or description"             // Optional
}
Image Requirements:
  • Must be HTTPS URL
  • Match the slot dimensions exactly
  • Supported: PNG, JPG, WebP, SVG
  • Max size: 2MB recommended
  • Make sure image loads fast
Test your image URL before submitting! Broken images cannot be refunded.

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Step 6: Review & Confirm

Review your booking:
  • Site: Where your ad appears
  • Format: Banner / Sidebar / Leaderboard
  • Duration: Start and end time
  • Total Cost: Hours × hourly rate
Example: 3 hours × 1 USDC = 3 USDC total Click “Purchase Ad Slot” when ready.

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Step 7: Approve Payment

MetaMask will pop up asking you to sign a message (NOT a transaction). This is the x402 gasless payment:
  • ✅ No transaction fee
  • ✅ No gas cost
  • ✅ Just one signature
  • ✅ Instant settlement
Click “Sign” to complete your purchase.
This is a cryptographic signature for payment authorization - it’s NOT a blockchain transaction, so there’s no gas fee!

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Step 8: Success!

You’ll see: 
🎉 Successfully purchased ad slot! 
Booking ID: abc123xyz
Your ad will:
  • ✅ Go live at your scheduled start time
  • ✅ Run for your selected duration
  • ✅ Appear in “My Ads Bookings” tab

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View Your Campaign

Click the “My Ads Bookings” tab to see:
  • All your active and scheduled ads
  • Start and end times
  • Sites where ads are running
  • Payment transaction details

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Tips for Best Results

  • Use high contrast colors
  • Keep text large and readable
  • Include a clear call-to-action
  • Show your product/logo prominently
  • Check site analytics before booking
  • Target times with highest traffic
  • Consider audience timezone
  • Make sure your link works
  • Optimize for mobile
  • Have a clear conversion goal
  • Track your clicks with UTM parameters
  • Book 1-2 hours first to test
  • Monitor performance
  • Scale up what works

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Common Issues

You need USDC on Base network. Check that:
  • You’re connected to Base (not Ethereum mainnet)
  • You have enough USDC for the total cost
  • USDC contract: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Someone just booked that slot. Try:
  • Refreshing the calendar
  • Choosing a different time
  • Picking a different site
  • Make sure MetaMask is unlocked
  • Check you’re on the marketplace tab
  • Try refreshing the page and reconnecting
  • Click “Switch Network” in the error message
  • Or manually switch to Base in MetaMask
  • Chain ID: 8453

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What’s Next?

Browse All Sites

See all available advertising sites

Check Availability

Query slots and availability

Learn About x402

How gasless payments work

View Your Bookings

Track your ad campaigns
Congratulations! You’ve launched your first gasless web3 ad campaign! 🎉