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Check out the x402 Ad Marketplace (UI)

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x402 Ad Marketplace

Buy advertising space on 100+ crypto content sites using USDC with zero gas fees thanks to x402 gasless payments.

No Gas Fees

Pay only the ad price - zero transaction fees

Instant Booking

One signature and you’re live

100+ Sites

Choose from crypto news, DeFi, NFT sites

Real Analytics

See traffic data before you buy

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Quick Start

1

Connect Wallet

Visit x402 Ad Marketplace and connect your wallet on Base network
2

Browse Sites

Explore sites with traffic stats, pick your target audience
3

Choose Format & Time

Select ad format (Banner/Sidebar/Leaderboard) and time slot
4

Upload Ad

Provide image URL and landing page
5

Sign & Pay

One signature with USDC - zero gas fees - instant confirmation
Need USDC on Base? Bridge from Ethereum using Base Bridge

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Ad Formats & Pricing

Duration: 1 hour minimum, 7 days (168 hours) maximum

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API Reference

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Browse Sites

GET https://x402.anyspend.com/ads/sites
Query parameters:
  • page - Page number (default: 1)
  • limit - Results per page (default: 20, max: 100)
  • search - Search by name/domain/keywords
curl "https://x402.anyspend.com/ads/sites?search=defi&limit=10"

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Get Slot Details

GET https://x402.anyspend.com/ads/slots/:slotId
Returns static slot information including pricing, format, and associated site details. 
curl "https://x402.anyspend.com/ads/slots/slot_banner_abc123"

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Check Current Ad

GET https://x402.anyspend.com/ads/slots/:slotId/current-ad
Returns the ad currently running in this slot, or indicates if the slot is available. 
curl "https://x402.anyspend.com/ads/slots/slot_banner_abc123/current-ad"

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View Your Campaigns

GET https://x402.anyspend.com/ads/bookings/buyer/:address
Track all your ad bookings - active, pending, and completed. 
curl "https://x402.anyspend.com/ads/bookings/buyer/0xYourAddress"
Status values:
  • active - Currently running
  • pending - Scheduled for future
  • completed - Campaign ended
Prices in API responses are in USDC wei (6 decimals). Divide by 1,000,000 to get USDC amount.

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Zero Gas with x402

x402 is the payment protocol that makes crypto payments feel like web2. Traditional crypto payments:
  • ❌ Multiple transactions (approve + transfer)
  • ❌ $5-15 in gas fees
  • ❌ 30-60 second wait times
  • ❌ Complex multi-step flows
With x402:
  • ✅ One signature - no transactions
  • ✅ Zero gas fees
  • ✅ Instant settlement
  • ✅ Simple one-click purchase

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How It Works

  1. You sign a payment authorization message (not a transaction)
  2. x402 facilitator submits the transaction for you
  3. Facilitator pays the gas
  4. You pay only the ad price
Always verify the amount and recipient before signing!

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Security

  • ✅ You control the signature
  • ✅ Signatures expire (can’t be replayed)
  • ✅ One-time use with unique nonce
  • ✅ Amount is locked (can’t charge more)

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Tips for Success

  • Use high contrast colors
  • Keep text large and readable
  • Include a clear call-to-action
  • Test image URL before booking
  • Match sites to your target market
  • Check traffic stats before booking
  • Consider multiple smaller sites vs one large site
Use UTM parameters in your landing page URL:
https://yoursite.com?utm_source=sitename&utm_medium=banner
  • Book 1-2 hours first to test
  • Monitor click-through rates
  • Scale up what works

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Common Issues

You need USDC on Base network. Check that:
  • You’re connected to Base (Chain ID: 8453)
  • You have enough USDC for the total cost
Someone just booked that slot. Refresh and choose a different time.
Currently, bookings cannot be cancelled or refunded. Make sure your ad is ready before booking.
No, ad content is locked at booking time. You’ll need to make a new booking to change it.

Launch Your Campaign

Start advertising on crypto sites in 5 minutes
View on x402scan: See live data →