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

Connect Wallet

Visit x402 Article Marketplace and connect your wallet on Base network

Choose Target Site

Select a crypto content site that matches your article topic

Provide Your Idea

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

Review & Approve

See AI suggestions and approval score before paying

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.

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"

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"

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

Note

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)

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

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

Request Body:

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

{
  "success": true,
  "data": {
    "approved": true,
    "score": 85,
    "reasoning": "Good topic for Base-focused site. AI optimized the title for better engagement.",
    "suggestedTitle": "Integrating Base Pay: A Complete Guide for Content Creators",
    "suggestedDescription": "Learn how to implement Base Pay in your creator platform with step-by-step examples and best practices.",
    "estimatedPrice": "50000000",
    "userProvidedTitle": false,
    "message": "Content approved with AI suggestions"
  }
}

{
  "success": true,
  "data": {
    "approved": true,
    "score": 95,
    "reasoning": "Excellent title! Clear, specific, and highly relevant to the site's audience.",
    "suggestedTitle": "How to Use Base Pay for Creators in Your DApp",
    "suggestedDescription": "Complete implementation guide for Base Pay",
    "estimatedPrice": "50000000",
    "userProvidedTitle": true,
    "message": "Content approved as-is"
  }
}

{
  "success": true,
  "data": {
    "approved": false,
    "score": 45,
    "reasoning": "Topic doesn't align with site's focus on Base ecosystem and DeFi. Consider submitting to a different site or adjusting your topic.",
    "estimatedPrice": "50000000",
    "message": "Content rejected - score too low"
  }
}

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.

json
{
  "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.

json
{
  "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.

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

AI generates a complete title and description.

Submit Article Request (x402 Payment)

bash
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:

{
  "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."
}

{
  "success": true,
  "data": {
    "requestId": "req_789...",
    "productSpecificId": "req_789...",
    "totalPrice": "50000000",
    "status": "pending"
  }
}

{
  "success": false,
  "error": "Content validation required before submission"
}

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:

typescript
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);

Note

See x402 SDK documentation for more details on using wrapFetchWithPayment.

View Your Submissions (Free)

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

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

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

{
  "success": true,
  "data": [
    {
      "requestId": "req_789...",
      "siteId": "site_123",
      "siteName": "Base Radar",
      "siteDomain": "baseradar.com",
      "title": "Integrating Base Pay: A Complete Guide for Content Creators",
      "description": "Learn how to implement Base Pay in your creator platform...",
      "status": "published",
      "totalPrice": "50000000",
      "publishedUrl": "https://baseradar.com/articles/integrating-base-pay",
      "createdAt": "2025-01-15T10:00:00.000Z",
      "publishedAt": "2025-01-18T14:30:00.000Z"
    },
    {
      "requestId": "req_790...",
      "siteId": "site_456",
      "siteName": "Solana Echo",
      "siteDomain": "solanaecho.com",
      "title": "Cross-Chain NFT Bridging: Solana to Base",
      "description": "Technical guide on bridging NFTs between Solana and Base",
      "status": "pending",
      "totalPrice": "75000000",
      "createdAt": "2025-01-20T08:15:00.000Z"
    }
  ]
}

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)

Info

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

Browse Sites (Free)

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

{
  "success": true,
  "data": [
    {
      "siteId": "site_123",
      "siteName": "Base Radar",
      "siteUrl": "https://baseradar.com",
      "siteDomain": "baseradar.com",
      "description": "News and analysis for the Base ecosystem",
      "keywords": ["base", "defi", "nft", "gaming"],
      "articlePrice": "50000000"
    },
    {
      "siteId": "site_456",
      "siteName": "Solana Echo",
      "siteUrl": "https://solanaecho.com",
      "siteDomain": "solanaecho.com",
      "description": "Solana ecosystem news and tutorials",
      "keywords": ["solana", "defi", "nft"],
      "articlePrice": "75000000"
    }
  ],
  "pagination": {
    "page": 1,
    "limit": 20,
    "total": 156,
    "hasNext": true
  }
}

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?

Your request goes to the publisher for review
Publisher evaluates your pitch (typically 1-7 days)
If accepted, they'll write/publish the article
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.