Pay once · No Friday subscription
Know a field fits before the marketplace silently truncates it.
Included in the $9.00 Shelf Kit
Sellers, agencies, and listing agents budgeting field length before a human upload, especially multibyte copy against byte caps.
Delivery: usually a structured result, workbook, or ZIP depending on the tool.
Friday counts characters and UTF-8 bytes in the fields you supply and compares them against general documented caps or your overrides. Within-limit is not proof that a field passes category, product-type, or program rules or that a marketplace will accept it, and caps are often stricter per category. A truncation preview is a mechanical cut, not edited copy. Friday reads no account or listing, fetches no live limit, does not publish listings, and does not edit or truncate any field in place.
Synthetic sample
{
"checked_field_count": 3,
"within_limit_count": 1,
"over_limit_count": 2,
"no_limit_count": 0,
"multibyte_field_count": 1,
"field_preview": [
{
"field": "title",
"limit_unit": "characters",
"max_units": 200,
"character_count": 214,
"byte_count": 214,
"status": "over_limit",
"over_by_units": 14
},
{
"field": "bullet_1",
"limit_unit": "characters",
"max_units": 500,
"character_count": 61,
"byte_count": 61,
"status": "within_limit",
"over_by_units": 0
},
{
"field": "search_terms",
"limit_unit": "bytes",
"max_units": 250,
"character_count": 248,
"byte_count": 254,
"is_multibyte": true,
"status": "over_limit",
"over_by_units": 4
}
],
"publish_status": "draft_needs_review",
"safety": "Length math only against general documented caps; no live template, account, or listing is read, and no field is edited or published."
}
This sample uses synthetic facts. Your output is generated only from the facts you submit.
POST /v1/listings/field-limit-validate
Exact x402 price: $0.25. Use the public OpenAPI schema and Base USDC payment flow. The response returns a private job URL and temporary token.