# Table Captions Text Length Ranking

> Table Captions Text Length Ranking is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Ranks table caption elements by text length on a given webpage or HTML snippet, optionally comparing against previous captions

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-web-captions-rank?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/table-captions-text-length-ranking-6ef1ff29
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_25f99kz9ohU0AA5Qw6sAo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability table-captions-text-length-ranking-6ef1ff29 -d '<json body>'
```

Example prompt: Go to https://example.com/products and rank all the table captions by text length — specifically look for captions with the id attribute 'main-caption' and compare against these previous captions: ['Old product list', 'Archive summary'].

## When to prefer this

Use this endpoint when you need a fast, cheap ($0.01 USDC) static analysis of table caption text lengths on a public webpage or known HTML snippet, without needing JavaScript rendering or authenticated access. Prefer it over general-purpose scraping tools when your specific goal is ranking or auditing table captions by length, especially when comparing against historical caption sets.

## Known failure modes

- URL is inaccessible or returns non-200 status — endpoint cannot fetch the page
- Page requires JavaScript rendering — static parser will miss dynamically generated captions
- No table captions found in the HTML — empty ranking result returned
- HTML exceeds 100,000 character limit — input rejected
- URL exceeds 2,048 character limit — input rejected
- Attribute name does not match pattern requirements — validation error
- Previous texts array exceeds 200 items — input rejected
- Payment not fulfilled — 402 response, no result returned

## How this service works

Table captions — Text length ranking: Text length ranking for Table captions. One public HTTPS page or supplied HTML; static parsing, no JavaScript rendering, login or access bypass. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded text length ranking result.

## Output

Returns a bounded text length ranking result listing table caption elements from the parsed page or HTML, ordered by text length, including relevant attribute matches and comparison against any provided previous caption texts. Costs $0.01 USDC per call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "default": "",
   "maxLength": 2048
  },
  "html": {
   "type": "string",
   "default": "<!doctype html><html><head></head><body><table><caption id=\"sample\">Example product guide</caption><tr><td>value</td></tr></table></body></html>",
   "maxLength": 100000
  },
  "term": {
   "type": "string",
   "default": "product",
   "maxLength": 100,
   "minLength": 1
  },
  "attribute": {
   "type": "string",
   "default": "id",
   "pattern": "^[a-zA-Z][a-zA-Z0-9:_-]{0,49}$",
   "maxLength": 50
  },
  "previous_texts": {
   "type": "array",
   "items": {
    "type": "string",
    "default": "",
    "maxLength": 1000
   },
   "default": [
    "Older example"
   ],
   "maxItems": 200,
   "minItems": 0
  },
  "attribute_value": {
   "type": "string",
   "default": "sample",
   "maxLength": 200
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/table-captions-text-length-ranking-6ef1ff29/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)