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API · /climbgrade-api

Climbing Grade API

healthy 3,760 Subscribers

Rock-climbing grade conversion as an API, computed locally and deterministically — the cross-system grade translations a climber, gym or guidebook app needs when the same route reads differently in every country. The route endpoint takes a roped-climbing grade in any major system — the American Yosemite Decimal System (5.5 to 5.15d), French sport grades (4b to 9c+), the UIAA scale used across Central Europe (IV to XIII-) or the Australian/New Zealand Ewbank numbers (12 to 40) — and returns the equivalents in all of them, so a 5.11a is a French 6c, a UIAA VII+ and an Ewbank 22. The boulder endpoint converts between the American V-scale (VB and V0 to V17) and the French Fontainebleau scale (3 to 9A), so a V5 is Font 6C and a problem graded 7A is about V6. You can pass a grade in any supported system and it finds the row and gives the rest — handy for syncing a tick list across regions or showing a climber a grade they recognise. Everything is computed locally and deterministically, so it is instant and private. Ideal for climbing, bouldering, gym, guidebook and outdoor-sports app developers, tick-list and route-database tools, and training-log software. Pure local computation — no key, no third-party service, instant. Chart equivalents — grades are inherently approximate across systems. Live, nothing stored. 2 conversion endpoints.

#climbing #bouldering #grades #outdoor #sports #developer-tools
api.oanor.com/climbgrade-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Climbing Grade 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
3,760
active
Total calls
60
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 7,300 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 7,300 calls/month
  • 2 req/sec
  • Route + boulder grade conversion
  • No credit card
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Starter

€4.38 /month

  • 55,800 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 55,800 calls/month
  • 6 req/sec
  • YDS, French, UIAA, Ewbank, V-scale, Font
  • Email support
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Pro

€12.15 /month

  • 229,500 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 229,500 calls/month
  • 15 req/sec
  • Tick-list & route-database pipelines
  • Priority support
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Mega

€37.60 /month

  • 1,336,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,336,000 calls/month
  • 40 req/sec
  • Platform scale
  • Dedicated SLA
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Climbing Fall API — oanor API marketplace

Climbing Fall API

Rock-climbing fall maths as an API, computed locally and deterministically — the safety numbers behind a lead fall, from the harshness of the catch to whether you hit the deck. The fall-factor endpoint gives the fall factor, distance fallen ÷ rope paid out, from 0 to a maximum of 2: it, not the absolute distance, decides how hard the catch is, so 4 metres on 2 metres of rope is a brutal factor-2 onto the anchor while the same fall on 10 metres of rope is a mild 0.4. The impact-force endpoint gives the peak force the rope transmits from the spring model F = mg + √((mg)² + 2·mg·k·f), where k is the rope modulus (~20 kN for a dynamic single rope) and f the fall factor — so an 80 kg climber on a factor-1 fall feels about 6.4 kN, and the top runner sees roughly 1.66× that from the pulley effect. The ground-fall endpoint adds it up: total drop = twice the height above the last piece, plus slack, plus the rope's stretch, and tells you whether that clears the ground or a ledge. Everything is computed locally and deterministically, so it is instant and private. Ideal for climbing apps, gym and guiding tools, route-planning and education sites, and gear calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Educational estimates — not a substitute for instruction and judgement.

api.oanor.com/climbing-api

 GPA API — oanor API marketplace

GPA API

Calculate a weighted grade-point average (GPA). The calc endpoint takes a list of courses — each with a grade and the credit hours it is worth — and returns the credit-weighted GPA, the totals, and a per-course breakdown of quality points so you can see exactly how the average was formed. Grades may be US letter grades (A, A-, B+, … F) on the standard 4.0 scale, or 4.3 with the us_plus scale that gives A+ extra weight; percentages from 0 to 100 mapped to letters and points with the usual cutoffs; raw grade points given directly as numbers; or your own custom letter-to-point mapping for any institution's scheme. Courses can be passed as a JSON array or a compact string like "A:3,B+:4,C:2", and credits default to 1 for an unweighted average. The scales endpoint lists the built-in grade scales and their point values. Everything is computed locally and deterministically, so it is instant and private — no student data is stored. Ideal for student planners and dashboards, university and school portals, LMS and ed-tech apps, scholarship and admissions tools, and academic what-if calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This computes GPA; for general statistics use a statistics API.

api.oanor.com/gpa-api

 Kite Flying API — oanor API marketplace

Kite Flying API

Kite-flying maths as an API, computed locally and deterministically — the line-pull, altitude and minimum-wind numbers a kite flyer, festival organiser or kite app works a flight out with. The line-pull endpoint gives the tension a kite puts on the line ≈ ½ × air density × wind speed² × sail area × a force coefficient (~0.8 for a typical flat or delta kite): because it rises with the square of the wind, doubling the wind quadruples the pull — a 1.5 m² kite holds about 47 N (nearly 5 kgf) at 8 m/s but four times that in a strong blow, so the line and your grip must be sized to the gusts, not the average. The altitude endpoint gives the flying height = the line let out × the sine of the line angle above the horizontal, with the downwind distance from the cosine: 100 m of line at a 45° angle reaches about 71 m up and 71 m downwind, while a heavy or under-flown kite sags to a low angle and never climbs. The min-wind endpoint gives the lightest wind that lifts off, where the aerodynamic lift just equals the weight: min wind = √(2 × mass × g ÷ (air density × area × lift coefficient)), so a 200 g, 1.5 m² kite needs only about 1.6 m/s (6 km/h) — lighter sails and bigger area drop the threshold. Everything is computed locally and deterministically, so it is instant and private. Ideal for kite-flying and festival apps, hobby and STEM-education tools, and outdoor calculators. Pure local computation — no key, no third-party service, instant. Flat-kite estimates — combine with real wind readings. 3 compute endpoints. For drag and terminal velocity use a drag API; for structural wind load a wind-load API.

api.oanor.com/kite-api

 Slackline Tension API — oanor API marketplace

Slackline Tension API

Tensioned-line point-load statics as an API, computed locally and deterministically — the line-tension and anchor-force numbers a slackliner, highliner or rigger works out before they weight a line. This is the V a loaded line makes under a person, not a self-weight catenary: the tension endpoint takes the span, the sag and the body load and returns the line tension and the horizontal anchor pull, because vertical balance is 2·T·sin(angle) = the body weight — so the flatter the line (the smaller the sag) the more the tension blows up, which is exactly why drum-tightening a line to kill the bounce can load the anchors to many times body weight. The sag endpoint inverts it: from a known line tension it returns the sag a mid-span load settles to (sin angle = weight ÷ twice the tension), and flags when the tension is too low to hold the load at all. The off-centre-load endpoint handles standing away from the middle, where the two halves carry different tensions: the horizontal pull is equal on both sides (H = weight × a × b ÷ (sag × span)) but the shorter, steeper segment runs at the higher tension and fails first — the reason a highliner near an anchor stresses that leash harder than one in the centre. Everything is computed locally and deterministically, so it is instant and private. Ideal for slackline and highline rigging tools, climbing and outdoor-gear apps, and tension-and-anchor calculators. Pure local computation — no key, no third-party service, instant. Geometric statics — combine with the real webbing and anchor ratings. 3 compute endpoints. For a self-weight hanging cable use a catenary API; for working-load-limit and safety factor a rigging API.

api.oanor.com/slackline-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Climbing Grade API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Climbing Grade API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Climbing Grade 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 Climbing Grade API cost?
Climbing Grade API has a free tier with 100 calls / month. Paid plans start at €4.38 / 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 Climbing Grade API GDPR-compliant?
All requests to Climbing Grade 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/climbgrade-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/climbgrade-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/climbgrade-api/SOME_PATH");
curl_setopt($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/climbgrade-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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