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.

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 89 ms; Server probes · 24h
Subscribers: 4,335; active
Total calls: 40; last 7 days

Full status page → · 20 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

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

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

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

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

Built by

PremiumApi

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Screen Printing API

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api.oanor.com/screenprint-api

Reptile Husbandry API

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api.oanor.com/reptile-api

Garden Pond API

Garden and koi-pond maths as an API, computed locally and deterministically — the numbers behind a backyard water feature, so you do not have to guess at the hose. The volume endpoint turns length, width and average depth into the water volume in cubic feet, US gallons and litres, applying a shape factor (rectangular 1.0, oval or round 0.79, irregular 0.85) because a liner pond never holds the full bounding box: an 8 × 6 ft pond two feet deep is about 96 cubic feet, or 718 gallons. The liner endpoint sizes the flexible liner to fit a pond — length equals the pond length plus twice the maximum depth plus twice the overlap to anchor under the edging stones (same for width), so that same 8 × 6 pond at two feet deep with a one-foot overlap needs a 14 × 12 ft liner and matching underlayment. The stock endpoint turns a water volume into a safe fish load and the pump you need: roughly one koi per 250 gallons (they grow large and dirty) or one goldfish per 20, plus the pump flow in gallons per hour to turn the whole pond over at least once an hour for koi — 718 gallons holds about two koi and wants a ~720 GPH pump before head-height losses. Everything is computed locally and deterministically, so it is instant and private. Ideal for landscaping and pond-installer tools, garden-design and home-improvement apps, koi and water-garden hobbyist sites, and aquascaping calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. For pool chemistry use a pool API; for indoor fish tanks use an aquarium API.

api.oanor.com/pond-api

Sunscreen & UV API

Sun-safety maths as an API, computed locally and deterministically — the burn-time, SPF and reapplication numbers a sunscreen, weather or outdoor app keeps people safe with. The burntime endpoint estimates how long until sunburn from the Fitzpatrick skin type (1 very fair to 6 deeply pigmented), the UV index and the SPF: unprotected time is a skin-type base (type II around 15 minutes) scaled by 6 ÷ UV index, and protected time is that times the SPF — so fair type-II skin at UV 8 burns in about 11 minutes bare, or roughly 5½ hours under SPF 30, while very fair type-I skin in extreme UV 11 burns in 5 minutes. The spf endpoint flips it: the SPF needed = your desired minutes outdoors ÷ the unprotected time, with the reminder that real protection plateaus around SPF 30–50. The amount endpoint covers the part people get wrong — about 2 mg/cm², roughly 1 ounce (30 g, a shot glass) for a full adult body, reapplied every two hours — and totals the sunscreen for a day out. Everything is computed locally and deterministically, so it is instant and private. Ideal for sun-safety, weather, skincare and outdoor app developers, UV-alert and reminder tools, and wellness software. Pure local computation — no key, no third-party service, instant. Educational estimates, not medical advice. Live, nothing stored. 3 compute endpoints.

api.oanor.com/sunscreen-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.

Paper 3

Meta 1

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

GET /v1/convert

GSM ↔ US basis weight

Playground

Parameters

Custom headers

Language: Client:

GET /v1/stocks

Paper stock reference

Playground

Parameters

Custom headers

Language: Client:

GET /v1/weight

Sheet / ream / M-weight

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Spec

Playground

Custom headers

Language: Client:

Code snippets

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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Paper Weight API

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Related APIs

Screen Printing API

Reptile Husbandry API

Garden Pond API

Sunscreen & UV API

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