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API · /slope-api

Slope & Grade API

healthy 3,042 Subscribers

Slope and grade maths as an API, computed locally and deterministically. The convert endpoint converts a slope between every common form — percent grade, angle in degrees, a ratio such as 1:12, per mille and rise-per-run — where the slope m = rise ÷ run = tan(angle). The distance endpoint relates the run (horizontal), the rise (vertical) and the slope distance (the hypotenuse) of a right-triangle slope: give any two, optionally with the grade or angle, and it returns the rest. The ramp endpoint sizes a wheelchair or ADA ramp — from a rise and a maximum slope (defaulting to 1:12, the ADA maximum of 8.33%) it returns the required run and total ramp length, and if you supply an actual run it checks whether the ramp is within the limit. Everything is computed locally and deterministically, so it is instant and private. Ideal for civil-engineering and surveying tools, road, trail and accessibility apps, construction and ramp design, and mapping software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is slope and grade geometry; for roof pitch specifically use a roofing API.

#slope #grade #ramp #gradient #accessibility #developer-tools
api.oanor.com/slope-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
86 ms
Server probes · 24h
Subscribers
3,042
active
Total calls
40
last 7 days
status Full status page → · 20 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 12,235 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 12,235 calls/month
  • 2 req/sec
  • Convert + distance + ramp
  • No credit card
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Starter

€13.75 /month

  • 21,850 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 21.85k calls/month
  • 8 req/sec
  • ADA ramp compliance
  • Email support
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Pro

€33.65 /month

  • 268,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 268.5k calls/month
  • 20 req/sec
  • Civil / surveying pipelines
  • Priority support
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Mega

€71.65 /month

  • 1,385,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.385M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Grade Calculator API

Single-course grade maths as an API, computed locally and deterministically — the everyday "what do I need on the final" student calculations. The needed endpoint works out the score required on the final exam (or any remaining component) to reach a target overall grade, from the current grade and the weight the final carries, and flags whether the target is achievable or already secured. The projected endpoint gives the overall grade you would finish with for a hypothetical final score. The average endpoint computes the weighted average of graded components from a simple score:weight list (such as 90:40,80:60), and reports the total and remaining weight so you can see how much of the course is still ungraded. Percentages run 0–100 and weights accept either a percentage (30) or a fraction (0.3). Everything is computed locally and deterministically, so it is instant and private. Ideal for student and study apps, learning-management tools, and tutoring and education sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is single-course grade mechanics; for a multi-course grade-point average from credit hours use a GPA API.

api.oanor.com/gradecalc-api

ADA Ramp API

ADA wheelchair-ramp maths as an API, computed locally and deterministically — the run, landing and slope numbers a builder or accessibility planner sizes a ramp by. The rule the ADA fixes is 1 inch of rise per 12 of run, a maximum 8.33 % slope, so the ramp endpoint turns a rise into the ramp: run = rise × 12 (or × 16 / × 20 for a gentler grade if you have the room), plus the level landings the code requires — a 5-foot landing top and bottom and another between runs whenever the rise exceeds 30 inches — and the total length end to end, so a 24-inch rise needs a 24-foot run and 34 feet overall, while a 36-inch rise breaks into two runs with an intermediate landing for 51 feet. The fit endpoint answers the real-world question: does a ramp for this rise fit the run you have? It returns the minimum run an ADA 1:12 ramp needs, whether your space is enough, and the slope you would actually get if you forced it in — flagging when that exceeds 8.33 % and you need a switchback or a lower rise. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, accessibility, home-modification and contractor app developers, ramp-estimator and code-check tools, and building software. Pure local computation — no key, no third-party service, instant. Confirm against current ADA and local code. Live, nothing stored. 2 compute endpoints.

api.oanor.com/adaramp-api

Gradient API

Generate colour gradients and colour scales programmatically. Produce an evenly-spaced scale of N colours between two or more stops (interpolated in a perceptually smooth colour space — lab, lch, oklab, oklch — or plain rgb/hsl), get a single interpolated colour at any position between two colours, and build a ready-to-paste CSS gradient string (linear with any angle, or radial) from a list of stops. Colours accept hex (#f00, #ff0000) or CSS names (red, steelblue). Perfect for data-visualisation colour ramps, heatmaps, chart palettes, theme generation and UI backgrounds. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from colour conversion / harmonious palettes (one base colour) and image palette extraction.

api.oanor.com/gradient-api

Braille API

Convert text to Unicode braille and back. Uses uncontracted (Grade 1) English braille: the 26 letters, digits with the number sign, capitals with the capital sign, and common punctuation, all output as Unicode Braille Patterns (U+2800–U+28FF) so they render anywhere. The to-braille endpoint turns ordinary text into braille; the from-braille endpoint decodes braille back to text. Unknown characters pass through unchanged. Perfect for accessibility tooling and education, labels and signage mockups, braille-display previews and learning resources. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. Grade 1 only (no contractions). Distinct from cipher/alphabet encoders and from general text transforms.

api.oanor.com/braille-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Slope & Grade API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Slope & Grade API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Slope & 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 Slope & Grade API cost?
Slope & Grade API has a free tier with 100 calls / month. Paid plans start at €13.75 / 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 Slope & Grade API GDPR-compliant?
All requests to Slope & 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/slope-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/slope-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/slope-api/SOME_PATH");
curl_setopt($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/slope-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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