# Jewelry Maker Calc

Ring size conversion, bead counts, necklace and bracelet lengths, metal weight, carat estimates, karat alloy mixing and melt value.

## How to pay

Machine-payable over x402. USDC on: Base (eip155:8453), Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp), Polygon (eip155:137), Arbitrum One (eip155:42161).
No accounts. No API keys. No signup. The paying wallet is the account.

## Machine-readable

- OpenAPI: https://jewelry-calc.x402tookit.com/openapi.json
- x402 manifest: https://jewelry-calc.x402tookit.com/.well-known/x402
- Catalog (free): https://jewelry-calc.x402tookit.com/catalog
- Health (free): https://jewelry-calc.x402tookit.com/health
- Uptime (free): https://jewelry-calc.x402tookit.com/uptime

## Endpoints (8)

### GET /bead-count — $0.02
Number of beads for a strand of a given finished length from bead size and spacing, with finished length and total weight.
Params: lengthInches?: number, lengthCm?: number, beadMm: number, spacingMm?: number, claspMm?: number, gramsPerBead?: number
Example: https://jewelry-calc.x402tookit.com/bead-count?lengthInches=16&beadMm=6

### GET /bracelet-size — $0.02
Bracelet or anklet length from wrist or ankle circumference and fit (snug, standard, comfortable, loose), with clasp allowance.
Params: circumferenceInches: number, fit?: string, unit?: string, claspInches?: number
Example: https://jewelry-calc.x402tookit.com/bracelet-size?circumferenceInches=6.5&fit=standard

### GET /diamond-weight — $0.02
Estimate a diamond's carats from millimetre size and shape, or the diameter of a round stone for a given carat weight.
Params: shape?: string, lengthMm?: number, widthMm?: number, depthPercent?: number, carats?: number
Example: https://jewelry-calc.x402tookit.com/diamond-weight?shape=round&lengthMm=6.5

### GET /karat-alloy — $0.02
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.
Params: karat?: number, fineGoldGrams?: number, goldGrams?: number, mixKarat1?: number, mixGrams2?: number, mixKarat2?: number
Example: https://jewelry-calc.x402tookit.com/karat-alloy?karat=18&fineGoldGrams=10

### GET /melt-value — $0.02
Melt value of gold, silver or platinum jewelry from weight, karat or fineness and the spot price per troy ounce you supply.
Params: grams: number, weightUnit?: string, karat?: number, fineness?: number, spotPerTroyOunce: number, payoutPercent?: number
Example: https://jewelry-calc.x402tookit.com/melt-value?grams=12.4&karat=14&spotPerTroyOunce=2000

### GET /metal-weight — $0.02
Casting weight in grams, pennyweight and troy ounces from volume or wax model weight, for gold, silver, platinum and more.
Params: metal: string, volumeCm3?: number, volumeMm3?: number, waxGrams?: number, waxDensity?: number, wastePercent?: number
Example: https://jewelry-calc.x402tookit.com/metal-weight?metal=sterling-silver&volumeCm3=0.8

### GET /necklace-length — $0.02
Name a necklace length (choker, princess, matinee, opera, rope) and where it sits, or suggest a length from neck size.
Params: lengthInches?: number, style?: string, neckInches?: number
Example: https://jewelry-calc.x402tookit.com/necklace-length?lengthInches=18&neckInches=14

### GET /ring-size — $0.02
Convert a ring size between US, EU (ISO circumference), UK letter, inside diameter and circumference in mm and inches.
Params: usSize?: number, euSize?: number, diameterMm?: number, circumferenceMm?: number
Example: https://jewelry-calc.x402tookit.com/ring-size?usSize=7

## Terms

Jewelry arithmetic computed locally from the numbers given, using standard published formulas and approximate densities, provided as is. Ring sizing varies by brand and finger (always try a physical sizer), carat-from-millimetre figures are estimates because cut and depth vary, and melt value is the metal content at the spot price you supply, not retail or resale value. No prices are built in. Not an appraisal or a certification of any stone or metal.