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API · /paper-api

Paper Weight API

healthy 4,335 Subscribers

Paper-weight maths as an API, computed locally and deterministically. The convert endpoint converts between grammage (GSM, grams per square metre — the universal measure) and the US basis weight in pounds, which depends on the paper stock type: bond/writing (basis 17×22 in), text/book/offset (25×38), cover (20×26), index (25.5×30.5), tag (24×36) and bristol (22.5×28.5). The weight endpoint computes the mass of a single sheet, a 500-sheet ream and the M-weight (the weight of 1000 sheets in pounds) at a given grammage and sheet size — accepting dimensions in millimetres, centimetres, inches or metres, or a named size (A3–A5, letter, legal, tabloid). The stocks endpoint is a reference of the US stock types with their conversion factors and basis sizes. Everything is computed locally and deterministically, so it is instant and private. Ideal for printing and publishing tools, stationery and packaging apps, print-shop estimators, and shipping-weight calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is paper grammage and basis weight; for general mass-unit conversion use a unit-conversion API.

#paper #gsm #basis-weight #printing #stationery #developer-tools
api.oanor.com/paper-api
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Machine-readable spec so AI agents can integrate this API.

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

Discovery: GET /api/index.json lists every API.

Paper Weight API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
83 ms
Server probes · 24h
Subscribers
4,335
active
Total calls
76
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 12,435 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 12,435 calls/month
  • 2 req/sec
  • Convert + weight + stocks
  • No credit card
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Starter

€13.95 /month

  • 22,050 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 22.05k calls/month
  • 8 req/sec
  • Ream & M-weight, named sizes
  • Email support
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Pro

€33.85 /month

  • 270,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 270.5k calls/month
  • 20 req/sec
  • Printing / publishing pipelines
  • Priority support
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Mega

€71.85 /month

  • 1,395,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.395M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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The open music-metadata database as an API — artists, release-groups (albums), releases, recordings and labels, identified by stable MusicBrainz IDs (MBIDs), returned as clean JSON. Search any entity by name or Lucene query; look up an artist with their external links and tags, an album, a release with its full track list, a recording with its ISRCs, or a label; and browse an artist's complete discography. Live data with MBIDs, disambiguations, types, countries, life spans, ISRCs, barcodes, catalogue numbers and relations — the canonical identifiers that link and de-duplicate music data across services. Ideal for metadata enrichment and matching, music catalogues, tagging and library tools, and research. 11 data endpoints. Authenticated with an x-oanor-key; fair-use rate limits per plan.

api.oanor.com/musicbrainz-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Paper Weight API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Paper Weight API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Paper Weight 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 Paper Weight API cost?
Paper Weight API has a free tier with 100 calls / month. Paid plans start at €13.95 / 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 Paper Weight API GDPR-compliant?
All requests to Paper Weight 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/paper-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/paper-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/paper-api/SOME_PATH");
curl_setopt($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/paper-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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