# MathML3 mpadded Original Metric Reference and Clamp Algebra Detector

> MathML3 mpadded Original Metric Reference and Clamp Algebra Detector is a paid API for AI agents from detect.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-11-05).

Analyzes MathML3 mpadded elements to distinguish references to original child dimensions, relative updates, and conditional zero-clamps without fabricating glyph metrics.

## Facts

- Endpoint: POST https://detect.halowerk.com/u/mathml3-mpadded-original-metric-reference-and-clamp-algebra?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-05
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mathml3-mpadded-original-metric-reference-and-clamp-algebra-detector-21fe93a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IJ_nZ2hpFTn6cTuIrY9Ws

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 mathml3-mpadded-original-metric-reference-and-clamp-algebra-detector-21fe93a3 -d '<json body>'
```

Example prompt: Before I migrate this MathML3 document to another formula format, can you check this URL and tell me whether the mpadded elements use original child dimension references like width/height/depth, relative updates, or conditional zero-clamps — without guessing at glyph metrics?

## When to prefer this

Use this endpoint when you need to semantically classify MathML3 mpadded dimension expressions — specifically to distinguish original-child-metric pseudo-unit references, relative adjustments, and zero-clamp conditionals — before performing format conversion or renderer migration where misidentifying these expression types would produce incorrect layout. Prefer this over generic XML parsers that have no MathML-semantic awareness.

## Known failure modes

- URL is inaccessible or returns non-200 response
- Content at URL is not valid MathML3 or contains no mpadded elements
- URL exceeds 2048 character limit
- Malformed mpadded attribute syntax that cannot be parsed
- Network timeout reaching the target URL

## How this service works

Before translating legacy MathML3 padding into another formula format, distinguish references to the original child width/height/depth, relative updates and conditional zero clamps without inventing glyph metrics.

## Output

A structured classification of the mpadded element's dimension expressions found at the provided URL, indicating which attributes reference original child metrics (width/height/depth pseudo-units), which represent relative updates, and which apply conditional zero-clamping — without inventing or assuming underlying glyph measurements.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "format": "uri",
   "maxLength": 2048
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mathml3-mpadded-original-metric-reference-and-clamp-algebra-detector-21fe93a3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from detect.halowerk.com](https://www.zero.xyz/host/detect.halowerk.com/llms.txt)