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API · /goldpurity-api

Gold Purity API

healthy 3,617 Subscribers

Gold purity and karat maths as an API, computed locally and deterministically — the karat, fineness and alloy numbers a jeweller, goldsmith, assayer or refiner works to. The karat-to-fineness endpoint converts between the two purity systems: karat is the number of 24ths of a piece that is pure gold, so the fineness (parts per thousand, the figure on a hallmark stamp) = karat ÷ 24 × 1000 and the gold percentage = karat ÷ 24 × 100 — 24K is pure (1000‰), 18K is 750‰ (75 %), 14K is 583‰, 9K is 375‰. The pure-gold-weight endpoint gives the actual fine gold in a piece = its total weight × the gold fraction (karat ÷ 24): a 10 g 18K ring holds 7.5 g of gold and 2.5 g of alloy, the fine-gold content a refiner pays on and the basis of the intrinsic metal value. The alloy-mix endpoint inverts it for the bench: to bring refined fine gold down to a target karat, the total weight = the fine gold ÷ (target karat ÷ 24) and the alloy to add = the total − the fine gold, so 7.5 g of pure gold makes 10 g of 18K with 2.5 g of master alloy. Everything is computed locally and deterministically, so it is instant and private. Ideal for jewellery and goldsmithing tools, pawn and scrap-gold apps, and assay and metal-value calculators. Pure local computation — no key, no third-party service, instant. Purity maths only — it does not fetch the live gold price. 3 compute endpoints. For a metal part's weight from its dimensions use a metal-weight API.

#gold #jewellery #karat #assay #precious-metals #developer-tools
api.oanor.com/goldpurity-api
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Machine-readable spec so AI agents can integrate this API.

/api/goldpurity-api/openapi.json
/api/goldpurity-api/llms.txt

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Gold Purity API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
79 ms
Server probes · 24h
Subscribers
3,617
active
Total calls
80
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 6,800 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 6,800 calls/month
  • 2 req/sec
  • Karat, fineness, pure gold, alloy mix
  • No credit card
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Starter

€7.40 /month

  • 60,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 60,000 calls/month
  • 6 req/sec
  • Hallmark & bench batching
  • Email support
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Pro

€24.60 /month

  • 248,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 248,000 calls/month
  • 15 req/sec
  • Pawn, scrap & assay pipelines
  • Priority support
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Mega

€76.00 /month

  • 1,150,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,150,000 calls/month
  • 40 req/sec
  • Platform & catalogue scale
  • Dedicated SLA
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Live free-market (bazaar) prices for the Iranian rial against foreign currencies, gold and gold coins. Iran's official rate is fixed and unused in practice; the real economy trades on the open bazaar rate, which is what this API exposes. The price endpoint returns one instrument's latest close/open/high/low, day change and date — in both rial and toman. The currencies endpoint returns every foreign currency (USD, EUR, GBP, AED, TRY, CNY, RUB …) against the rial at once. The gold endpoint returns Iran's gold market — the global ounce, 18k and 24k gram, the mesghal, and the famous gold coins (Emami, Bahar Azadi, half, quarter, gerami). The history endpoint returns an instrument's daily OHLC series. Read live, nothing stored. This is Iran's own free-market rial/gold/coin layer — distinct from official central-bank feeds and from other countries' parallel-dollar APIs.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Gold Purity API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Gold Purity API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Gold Purity API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Gold Purity API cost?
Gold Purity API has a free tier with 100 calls / month. Paid plans start at €7.40 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Gold Purity API GDPR-compliant?
All requests to Gold Purity API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/goldpurity-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/goldpurity-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/goldpurity-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/goldpurity-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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