# Jewelry Maker Calc – Necklace Length

> Jewelry Maker Calc – Necklace Length is a paid API for AI agents from jewelry-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Returns the length range, body placement, and style name for a necklace given a style name, neck circumference, or chain length in inches.

## Facts

- Endpoint: GET https://jewelry-calc.x402tookit.com/necklace-length?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/jewelry-maker-calc-necklace-length-f05cd0af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tdRZ_Ms2yssAJIUxxB4Nj

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 jewelry-maker-calc-necklace-length-f05cd0af
```

Example prompt: What necklace style is a 20-inch chain, and where does it sit on the body?

## When to prefer this

Use this endpoint when you need to look up standard necklace length classifications, find where a given chain length sits on the body, or suggest a style for a known neck circumference. It is purpose-built for jewelry makers, shoppers, and stylists who need authoritative length-to-style mappings in both imperial and metric units, and it covers all major styles from collar to rope.

## Known failure modes

- Missing all query parameters returns an error or empty result — at least one of style, lengthInches, or neckInches must be provided
- Unrecognized style string returns null or an error response
- Out-of-range neckInches values may produce unexpected suggestions
- Conflicting parameters (e.g. both style and lengthInches) may be resolved by precedence with no warning

## How this service works

Name a necklace length (choker, princess, matinee, opera, rope) and where it sits, or suggest a length from neck size.

## Output

Returns a JSON object with the identified or suggested necklace style name, its length range in inches, equivalent length in centimetres, a description of where it sits on the body, clasp allowance notes, and — when a neck measurement is provided — suggested choker and princess lengths tailored to that neck size. Also includes a human-readable summary and disclaimer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "style": {
       "type": "string",
       "description": "collar, choker, princess, matinee, opera or rope, to get its length range"
      },
      "neckInches": {
       "type": "number",
       "description": "Neck circumference in inches, to suggest a length per style (add the clasp allowance)"
      },
      "lengthInches": {
       "type": "number",
       "description": "A chain length in inches, to name it (use this or style)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "clasp": {
       "type": [
        "null",
        "string"
       ]
      },
      "style": {
       "type": [
        "null",
        "string"
       ]
      },
      "sitsAt": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "lengthCm": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "neckInches": {
       "type": [
        "null",
        "number"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "lengthInches": {
       "type": [
        "null",
        "number"
       ]
      },
      "sn
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/jewelry-maker-calc-necklace-length-f05cd0af/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from jewelry-calc.x402tookit.com](https://www.zero.xyz/host/jewelry-calc.x402tookit.com/llms.txt)