x402 Article Placement

Publish articles on crypto content sites with our AI crypto writer and get visibility

Check out the x402 Article Marketplace (UI)

AI Validation

AI scores your content and generates optimized titles

No Gas Fees

Pay only the article price - zero transaction fees

100+ Sites

Submit to crypto news, DeFi, NFT sites

Instant Submission

One signature and your pitch is sent

How It Works

1. Connect Wallet

   Visit x402 Article Marketplace and connect your wallet on Base network

2. Choose Target Site

   Select a crypto content site that matches your article topic

3. Provide Your Idea

   Enter a tweet URL, topic idea, or complete article title

4. Review & Approve

   See AI suggestions and approval score before paying

5. Submit & Pay

   One signature with USDC - zero gas fees - instant submission to publisher

AI Validation Rules

The AI validation endpoint scores your article idea and either approves it as-is, suggests improvements, or rejects it.

✅ Score ≥80

Perfect! Your input is approved as-is.

Your provided title or topic is excellent and fits the site’s focus. No changes needed - we’ll submit it exactly as you wrote it.

Example: “How to Use Base Pay for Creators in Your DApp”

⚠️ Score 70-79

Good with Suggestions! AI provides an improved version.

Your content is relevant but could be optimized. AI generates a better title and description while keeping your core idea.

Example Input: “base pay for creators”

AI Output: “Integrating Base Pay: A Complete Guide for Content Creators”

❌ Score <70

Rejected. Content doesn’t fit the site’s focus.

Your topic is off-topic for this site. Try a different topic or choose a different site that better matches your content.

Example: Submitting a cooking recipe to a crypto news site

Pricing

Article submission prices vary by site based on their traffic and authority.

Typical Ranges:

• Small/emerging sites: $3-50 USDC per submission
• Mid-tier sites: $50-200 USDC per submission
• Premium sites: $200-500 USDC per submission

Prices are set by individual publishers. Check the site details before submitting.

API Reference

Network & Payment Details

Network · Base

Chain ID: 8453

Payment Token · USDC

6 decimals

Protocol · x402

ERC-20 Permit signatures

Max Price · $1000

Maximum price per submission

Validate Article Idea (Free)

POST https://x402.anyspend.com/articles/validate

Free endpoint to validate your article idea. AI generates a title, description, and approval score.

Request Body:

Request

{
  "siteDomain": "baseradar.com",
  "userInput": "How to use Base Pay for creators"
}

Parameters:

• siteDomain (required) - Target site domain (e.g., “baseradar.com”)
• userInput (required) - Tweet URL, topic idea, or complete title (10-200 characters)

Input Options:

Option 1: Complete Title

Provide a ready-to-use article title.

{
  "siteDomain": "baseradar.com",
  "userInput": "How to Build a DEX on Base with Uniswap V3"
}

If approved (score ≥90), your title is used as-is.

Option 2: Tweet URL

Provide a tweet URL with relevant content.

{
  "siteDomain": "solanaecho.com",
  "userInput": "https://x.com/BuildOnBase/status/1234567890"
}

AI extracts the topic and generates a title/description.

Option 3: Topic/Idea

Provide a short topic or idea.

{
  "siteDomain": "baseradar.com",
  "userInput": "base pay for creators"
}

AI generates a complete title and description.

Submit Article Request (x402 Payment)

POST https://x402.anyspend.com/articles/buy

Submit an article request with x402 payment. You must validate your content first and receive approval.

Request Body:

Request

{
  "buyerAddress": "0x742d35Cc6...",
  "siteDomain": "baseradar.com",
  "title": "Integrating Base Pay: A Complete Guide for Content Creators",
  "description": "Learn how to implement Base Pay in your creator platform with step-by-step examples and best practices."
}

Parameters:

• buyerAddress (required) - Your wallet address
• siteDomain (required) - Target site domain
• title (required) - Article title (from validation or your own if score ≥90)
• description (required) - Article description (from validation or your own)

JavaScript/TypeScript Example:

import { wrapFetchWithPayment } from '@b3dotfun/anyspend-x402-fetch';
import { createWalletClient, custom, publicActions } from 'viem';
import { base } from 'viem/chains';

// Step 1: Validate your content (FREE)
const validateResponse = await fetch('https://x402.anyspend.com/articles/validate', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    siteDomain: 'baseradar.com',
    userInput: 'How to use Base Pay for creators'
  })
});

const validation = await validateResponse.json();

if (!validation.data.approved) {
  console.error('Content rejected:', validation.data.reasoning);
  process.exit(1);
}

console.log('✅ Approved! Score:', validation.data.score);
console.log('Title:', validation.data.suggestedTitle);

// Step 2: Submit with payment (x402)
const walletClient = createWalletClient({
  account: '0x742d35Cc6...',
  chain: base,
  transport: custom(window.ethereum),
}).extend(publicActions);

const fetchWithPayment = wrapFetchWithPayment(
  fetch,
  walletClient,
  BigInt(1000 * 10 ** 6) // Max 1000 USDC
);

const response = await fetchWithPayment(
  'https://x402.anyspend.com/articles/buy',
  {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      buyerAddress: '0x742d35Cc6...',
      siteDomain: 'baseradar.com',
      title: validation.data.suggestedTitle,
      description: validation.data.suggestedDescription
    })
  }
);

const result = await response.json();
console.log('🎉 Article submitted! Request ID:', result.data.requestId);

See x402 SDK documentation for more details on using wrapFetchWithPayment.

View Your Submissions (Free)

GET https://x402.anyspend.com/articles/requests/buyer/:address

Track all your article submissions - pending, accepted, and published.

cURL

curl "https://x402.anyspend.com/articles/requests/buyer/0xYourAddress"

Status values:

• pending - Submitted to publisher, awaiting review
• accepted - Publisher accepted, article in production
• published - Article is live (includes publishedUrl)
• rejected - Publisher declined (rare, usually pre-validated)

Prices in API responses are in USDC wei (6 decimals). Divide by 1,000,000 to get USDC amount.

Browse Sites (Free)

GET https://x402.anyspend.com/ads/sites

List all sites accepting article submissions. Same endpoint as ad marketplace - sites support both ads and articles.

cURL

curl "https://x402.anyspend.com/ads/sites?limit=20"

AI Validation Tips

Write Clear, Specific Titles

Good: “How to Build a DEX on Base with Uniswap V3”

Bad: “DeFi stuff”

Specific titles score higher and are more likely to be approved.

Match Site Focus

Check site keywords and description before submitting. A Base-focused article won’t score well on a Solana-only site.

Use Complete Sentences for Titles

Good: “How to Use Base Pay for Creators in Your DApp”

Bad: “base pay creators”

Complete titles (10-200 chars) get higher scores.

Leverage Tweet URLs

If you have a viral tweet about your topic, use the URL! AI extracts context and generates a relevant title.

Common Issues

'Content rejected' with low score

Your topic doesn’t fit the site’s focus. Options:

• Choose a different site that matches your topic better
• Adjust your topic to align with the site’s keywords
• Provide a more specific, detailed title

'Content validation required' error

You must call /articles/validate first and get approval before calling /articles/buy.

'Insufficient balance' error

You need USDC on Base network. Check that:

• You’re connected to Base (Chain ID: 8453)
• You have enough USDC for the article price

What happens after I submit?

1. Your request goes to the publisher for review
2. Publisher evaluates your pitch (typically 1-7 days)
3. If accepted, they’ll write/publish the article
4. You’ll receive the published URL once live

Track status via /articles/requests/buyer/:address

Can I edit my submission after paying?

No, submissions are locked after payment. Make sure your content is correct before submitting.

What if the publisher rejects my article?

Publishers rarely reject pre-validated content, but if they do, the status will show “rejected”. Refunds are handled case-by-case - contact the publisher directly.

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 submission

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 article price

Always verify the amount and recipient before signing!

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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Related: Ad Marketplace • x402 Overview • x402scan →