# Aside Blocks Prior Text-Set Comparison

> Aside Blocks Prior Text-Set Comparison is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Extracts aside block text from a webpage and compares it against a supplied set of previous text values to detect changes or matches.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-web-asides-compare?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aside-blocks-prior-text-set-comparison-141a4c6e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0ff19K323vTRoPeLbYnM1

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 aside-blocks-prior-text-set-comparison-141a4c6e -d '<json body>'
```

Example prompt: Check the aside block with id 'product-notice' on https://example.com/docs and compare its current text against these previous versions: ['Older guide text', 'Draft product guide'] — tell me if it has changed.

## When to prefer this

Choose this endpoint when you need to compare the text content of an HTML aside element on a static page against a known set of historical text values — for change detection, content monitoring, or validation workflows. It is purpose-built for aside elements and uses a shared multi-profile engine, making it cost-effective at $0.01 USDC per call. Prefer it over general-purpose scrapers when the target is specifically an aside block and you already have prior text values to compare against.

## Known failure modes

- URL is unreachable or returns a non-200 status — no content extracted
- Aside element with specified attribute/value not found on page — empty or null result
- HTML payload exceeds 100,000 character limit — request rejected
- JavaScript-rendered content not available since only static HTML is parsed
- previous_texts array exceeds 200 items — request rejected
- Invalid attribute name pattern — validation error

## How this service works

Aside blocks — Prior text-set comparison: Prior text-set comparison for Aside blocks. 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 prior text-set comparison result.

## Output

Returns a bounded comparison result indicating whether the current text of the matched aside block matches, differs from, or is new relative to the supplied set of previous texts. Includes the extracted aside text and comparison status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "default": "",
   "maxLength": 2048
  },
  "html": {
   "type": "string",
   "default": "<!doctype html><html><head></head><body><aside id=\"sample\" data-kind=\"example\">Example product guide</aside></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/aside-blocks-prior-text-set-comparison-141a4c6e/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)