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Friday Seller Tools – Field Limit Validator
x402
Friday Seller Tools – Field Limit Validator is a paid API for AI agents from friday-seller-tools-production.up.railway.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).
Validates marketplace listing fields (Amazon, Walmart, Shopify, eBay) against platform-specific character and content limits before upload.
Price / call$0.25
Success—
StatusUnknown
How this service works
Instant, low-cost Amazon, Walmart, Shopify, and eBay listing, upload-preparation, advertising, and image-brief deliverables.
Output
Returns a job ID and status (queued/complete) along with field-level validation results indicating which listing fields pass or fail marketplace-specific character and content limits, with details on violations.
Example use cases
Amazon listing pre-upload check
“Before I push this product to Amazon, validate my listing fields — my title is 210 characters, my bullet points are around 250 each, and my description is 1,800 characters. Will any of these exceed Amazon's limits?”
Walmart bulk listing compliance
“I'm about to upload 50 products to Walmart Marketplace. Can you validate that my product titles and short descriptions all fit within Walmart's field character limits so I don't get upload errors?”
Shopify product description validation
“I've written out my product title, description, and meta fields for a new Shopify listing — can you run them through Friday Seller Tools to check if any fields are over the platform's character limits before I publish?”
Technical details
Endpoint
POSThttps://friday-seller-tools-production.up.railway.app/v1/listings/field-limit-validateWhen to prefer
Choose this endpoint when you need to pre-validate marketplace listing fields against platform-specific character limits before attempting an upload to Amazon, Walmart, Shopify, or eBay. It is especially useful in automated listing pipelines to catch field-length violations early, avoiding rejected uploads and wasted listing fees.
Side effects
- Invalid or missing platform identifier returns validation error
- Malformed field input causes 400 bad request
- Unsupported marketplace platform returns unsupported error
- Empty field values may return inconclusive validation
- Service unavailable on Railway deployment returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| title | — | |
| bullets | — | |
| overrides | array | |
| description | — | |
| marketplace | string | |
| search_terms | — |
Output
Schema · Response
{
"type": "json",
"example": {
"job_id": "example",
"status": "queued"
}
}Tags
x402
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