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API · /physics-api

Physics Motion API

healthy 4,223 Subscribers

Classical-mechanics maths as an API. The kinematics endpoint is a full SUVAT solver: give any three of initial velocity (u), final velocity (v), acceleration (a), time (t) and displacement (s) and it computes the rest using the standard constant-acceleration equations. The projectile endpoint takes a launch speed and angle (and an optional launch height and gravity) and returns the horizontal and vertical velocity components, the time to the peak, the maximum height, the total flight time, the range and the impact speed. The free-fall endpoint computes a vacuum fall from a height or for a time, with an optional initial velocity, returning the fall time, distance and impact velocity. Gravity defaults to standard 9.80665 m/s² but can be set for the Moon, Mars or any body. Everything is computed locally and deterministically in SI units, so it is instant and private. Ideal for physics education and homework, engineering and simulation, game and ballistics development, and motion tools. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is motion physics; for planetary data use a planets API and for unit conversion use a unit API.

#physics #kinematics #projectile #mechanics #science #developer-tools
api.oanor.com/physics-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Physics Motion API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
72 ms
Server probes · 24h
Subscribers
4,223
active
Total calls
76
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 7,835 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 7,835 calls/month
  • 2 req/sec
  • Kinematics + projectile + free fall
  • No credit card
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Starter

€9.35 /month

  • 17,350 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 17.35k calls/month
  • 8 req/sec
  • Full SUVAT solver
  • Email support
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Pro

€29.25 /month

  • 224,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 224.5k calls/month
  • 20 req/sec
  • Education / simulation pipelines
  • Priority support
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Mega

€67.25 /month

  • 1,165,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.165M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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 Center of Mass API — oanor API marketplace

Center of Mass API

Centre-of-mass and barycentre mechanics as an API, computed locally and deterministically. The point-masses endpoint computes the centre of mass of a system of point masses in one, two or three dimensions, applying x_com = Σ(m_i·x_i)/Σm_i to each axis from a list of masses and their x (and optional y and z) coordinates — masses of 1, 2 and 3 at positions 0, 1 and 2 give a centre of mass at 1.333, and four equal masses at the corners of a square sit at its centre. The two-body endpoint computes the barycentre of two masses separated by a distance, r1 = d·m2/(m1+m2) from the first body, which always lies closer to the heavier one — for the Earth-Moon system the barycentre is about 4 670 km from Earth’s centre, still inside the planet. Lists may be passed as comma-separated values (masses=1,2,3&x=0,1,2) or as JSON arrays in a POST body, and units are consistent and unit-agnostic. Everything is computed locally and deterministically, so it is instant and private. Ideal for physics, engineering-statics, astronomy, robotics, game-physics and mechanics-education app developers, balance-point and barycentre tools, and simulation software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 2 endpoints. This is the centre of mass; for the rotational moment of inertia use a moment-of-inertia API.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Physics Motion API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Physics Motion API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Physics Motion 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 Physics Motion API cost?
Physics Motion API has a free tier with 100 calls / month. Paid plans start at €9.35 / 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 Physics Motion API GDPR-compliant?
All requests to Physics Motion 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/physics-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/physics-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/physics-api/SOME_PATH");
curl_setopt($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/physics-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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