# Jewelry Melt Value Calculator

> Jewelry Melt Value 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 2026-10-29).

Calculates the intrinsic melt value of gold, silver, or platinum jewelry from weight, purity (karat or fineness), and a user-supplied spot price per troy ounce.

## Facts

- Endpoint: GET https://jewelry-calc.x402tookit.com/melt-value?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-melt-value-calculator-0dc63881
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X1PReSCL6J1FVo5KvE9Yi

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-melt-value-calculator-0dc63881
```

Example prompt: What's the melt value of an 18k gold ring that weighs 5.2 grams, given that gold is currently $3,200 per troy ounce? Also assume the buyer pays 85% of melt value.

## When to prefer this

Use this endpoint when you need a deterministic, formula-based melt value computation and you already have a current spot price from a market data source. It is ideal for jewelry resale agents, estate valuation tools, scrap metal buyers, and jewelry makers who need the raw metal cost of a piece. Prefer this over general-purpose LLM math when you need structured per-field breakdowns (pure metal weight, purity percent, payout-adjusted value) without hallucination risk.

## Known failure modes

- Missing required 'grams' parameter causes a 400-class error
- Missing 'spotPerTroyOunce' returns an error since no built-in spot price exists
- Neither 'karat' nor 'fineness' supplied may produce a null or error result
- Karat value out of 1–24 range or fineness out of 0–1000 may be rejected or return unexpected purity
- Invalid weightUnit string may fall back to grams or return an error
- Payment failure (x402) returns 402 before any calculation is attempted

## How this service works

Melt value of gold, silver or platinum jewelry from weight, karat or fineness and the spot price per troy ounce you supply.

## Output

Returns melt value in the caller's currency, along with a breakdown of pure metal weight (grams, pennyweights, troy ounces), purity percentage derived from karat or fineness, melt value per gram of the whole piece, and optionally a discounted melt value at a given payout percentage. Also includes an 'asOf' timestamp and source/disclaimer fields.

## 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": [
      "grams",
      "spotPerTroyOunce"
     ],
     "properties": {
      "grams": {
       "type": "number",
       "description": "Total weight of the piece (grams unless weightUnit says otherwise)"
      },
      "karat": {
       "type": "number",
       "description": "Gold karat 1 to 24 (use karat or fineness)"
      },
      "fineness": {
       "type": "number",
       "description": "Fineness per thousand, for example 925 for sterling or 750 for 18k"
      },
      "weightUnit": {
       "type": "string",
       "description": "g (default), dwt, ozt (troy ounces) or oz (avoirdupois ounces)"
      },
      "payoutPercent": {
       "type": "number",
       "description": "Share of melt value a buyer pays, 1 to 100 (default 100)"
      },
      "spotPerTroyOunce": {
       "type": "number",
       "description": "The metal's price per troy ounce, in your currency (you supply it; none is built in)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "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"
       ]
      },
      "meltValue": {
       "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-melt-value-calculator-0dc63881/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)