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MatrixFold Social Post Validator
x402
MatrixFold Social Post Validator is a paid API for AI agents from api-production-853c.up.railway.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Validates X/Twitter, LinkedIn, and Xiaohongshu posts for platform compliance before publishing, returning rule codes, risk score, and suggested fixes.
Price / call$0.003
Success—
StatusUnknown
Output
A JSON object containing rule violation codes (e.g. excessive hashtags, off-platform contact detected, length exceeded), a numeric risk score, and actionable fix suggestions for each violation found in the post.
Example use cases
Example prompt
“Before I post this on LinkedIn, can you run a compliance check on it: 'Excited to announce our new product launch! Contact me at john@gmail.com or WhatsApp +1-555-0123. Follow for updates! #hiring #startup #tech #innovation #growth #linkedin #networking #B2B #entrepreneur #CEO' — flag any rule violations, give me a risk score, and tell me what to fix.”
Technical details
Endpoint
POSThttps://api-production-853c.up.railway.app/v1/validateWhen to prefer
Use this endpoint when an AI agent needs to pre-screen social media posts for X/Twitter, LinkedIn, or Xiaohongshu before publishing — especially to catch platform-specific rule violations like hashtag limits, emoji density, off-platform contact scraping terms, link restrictions, and character length. Prefer this over generic text analysis when you need platform-specific rule codes and risk scoring rather than sentiment or readability.
Side effects
- Missing or unsupported platform identifier returns an error
- Post text field empty or null causes validation failure
- Network timeout from Railway hosting environment
- Malformed JSON request body returns 400-level error
- Payment not processed (x402 protocol failure) blocks the call
Input
{
"text": "Excited to announce our new product launch! We're committed to delivering innovative solutions for our customers. Follow for updates! #startup #tech #innovation",
"platform": "x"
}Output
{
"score": 100,
"valid": true,
"errors": [],
"metrics": {
"chars": 160,
"links": 0,
"emojis": 0,
"images": 0,
"hashtags": 3,
"lineBreaks": 0
},
"platform": "x",
"warnings": [],
"riskLevel": "low",
"suggestedFixes": []
}Tags
x402
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