# Jewelry Maker Calc – Karat & Alloy Calculator

> Jewelry Maker Calc – Karat & Alloy Calculator is a paid API for AI agents from jewelry-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-03).

Converts a gold karat to fineness and purity percentage, calculates how much alloy to add to fine gold to reach a target karat, or finds the resulting karat when mixing two pieces of gold.

## Facts

- Endpoint: GET https://jewelry-calc.x402tookit.com/karat-alloy?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/jewelry-maker-calc-karat-alloy-calculator-072823f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WNnn_CBBRqD8JL8mgZZdc

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-karat-alloy-calculator-072823f1
```

Example prompt: I have 15 grams of fine 24k gold and want to alloy it down to 18 karat — how much alloy metal do I need to add, and what will the fineness and gold percentage be?

## When to prefer this

Use this endpoint when you need precise jewelry-industry karat-to-fineness conversions, alloy addition calculations for goldsmithing, or karat blending math for combining two pieces of gold. It is purpose-built for jewelers and metalworkers, covering the three core gold alloy scenarios in one API.

## Known failure modes

- Missing required karat or input parameters returns an error or null results
- Karat value outside 1–24 range may return validation errors
- Conflicting mix parameters (e.g. providing both karat and mix fields simultaneously) may cause unexpected results
- Network or payment failure returns HTTP 402 or 5xx

## How this service works

Gold karat to fineness and percent, and the alloy to add to fine gold to reach a target karat, or the karat of a mix.

## Output

Returns the fineness (parts per thousand), gold percentage, alloy percentage for the given karat; or the grams of alloy metal needed and total alloyed grams to reach a target karat from fine gold; or the resulting karat when combining two pieces. Includes a summary field 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": {
      "karat": {
       "type": "number",
       "description": "A karat from 1 to 24 (for the fineness and alloy mix)"
      },
      "goldGrams": {
       "type": "number",
       "description": "Alternative: grams of gold at mixKarat1 to combine with mixGrams2 (see mix fields)"
      },
      "mixGrams2": {
       "type": "number",
       "description": "Grams of the second piece"
      },
      "mixKarat1": {
       "type": "number",
       "description": "Karat of the first piece, for the mix calculation"
      },
      "mixKarat2": {
       "type": "number",
       "description": "Karat of the second piece (0 for pure alloy metal)"
      },
      "fineGoldGrams": {
       "type": "number",
       "description": "Grams of fine (24k) gold you start with, to get the alloy needed for the target karat"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "karat": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "fineness": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/jewelry-maker-calc-karat-alloy-calculator-072823f1/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)