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API · /chmod-api

chmod API

healthy 3,654 Subscribers

A Unix file-permission calculator as an API. Convert a symbolic permission string (rwxr-xr-x) to its octal mode (755) and back, and explain any mode in plain English with a per-class breakdown (owner / group / others, each read / write / execute). Full support for the special bits — setuid (4), setgid (2) and the sticky bit (1) — so 4755 ↔ rwsr-xr-x and 1777 ↔ rwxrwxrwt are handled correctly, including the capital S/T forms. Perfect for Dockerfiles and CI scripts, deployment and provisioning tooling, teaching, and any time you need to double-check a chmod value. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from anything that touches real files or networking.

#chmod #unix #permissions #linux #sysadmin #developer-tools
api.oanor.com/chmod-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
87 ms
Server probes · 24h
Subscribers
3,654
active
Total calls
56
last 7 days
status Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 720 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 720 calls/month
  • 2 req/sec
  • Symbolic + octal + describe
  • No credit card
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Starter

€0.90 /month

  • 5,700 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 5.7k calls/month
  • 8 req/sec
  • setuid/setgid/sticky
  • Email support
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Pro

€18.60 /month

  • 123,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 123k calls/month
  • 20 req/sec
  • CI / provisioning pipelines
  • Priority support
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Mega

€54.60 /month

  • 635,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 635k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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AUR API

The Arch User Repository (AUR) as an API. Look up any AUR package for its version, description, upstream URL, maintainer and submitter, community votes and popularity score, license, out-of-date flag, keywords and full dependency lists (depends, make-depends, opt-depends), plus its source snapshot and ready-to-run git-clone command; search the whole AUR by name, description, maintainer, dependencies or keywords (results sorted by popularity); and list every package maintained by a given user. Covers the 90,000+ community-maintained packages of Arch Linux, from yay, paru and visual-studio-code-bin to google-chrome and spotify. Live from the official AUR RPC. Ideal for Arch/AUR helpers and dashboards, package and dependency tooling, and Linux developer portals. Open data from the Arch User Repository.

api.oanor.com/aur-api

Flathub API

The Linux desktop-app store — Flathub (Flatpak) — as an API. Look up any app by its reverse-DNS id for its name, summary and description, developer, license, categories, homepage / bug-tracker / donation links, latest version and release date, screenshot count and total install count; search the whole store by keyword; and read an app's install statistics, including last-month and last-7-day installs and the top countries. Every app comes with the exact `flatpak install` command. Covers the Linux desktop from Firefox, Blender, GIMP, OBS Studio and Inkscape to VLC, Krita and LibreOffice. Live from the official flathub.org API. Ideal for app catalogs and dashboards, software-center integrations, Linux developer tooling and install-analytics. Open data from Flathub.

api.oanor.com/flathub-api

RAID Calculator API

RAID storage-array maths as an API, computed locally and deterministically. The capacity endpoint computes the usable and raw capacity, the storage efficiency and the fault tolerance of a RAID level — RAID 0 stripes for n×disk with no redundancy, RAID 1 mirrors to one disk and tolerates n−1 failures, RAID 5 gives (n−1)×disk with one-disk tolerance, RAID 6 gives (n−2)×disk with two-disk tolerance, and RAID 10 gives (n/2)×disk — and reports the minimum disks each level needs. The compare endpoint lays the levels side by side for the same disks and disk size so you can weigh capacity against redundancy. The rebuild endpoint estimates how long it takes to rebuild a single disk at a given rebuild speed, the window during which a second failure would lose data in RAID 5/6. Everything is computed locally and deterministically, so it is instant and private. Ideal for storage, NAS, server and IT-admin app developers, capacity-planning and procurement tools, and homelab calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is RAID array sizing; for data-transfer time use a transfer API.

api.oanor.com/raid-api

Air Compressor API

Compressed-air maths as an API, computed locally and deterministically — the receiver, pump-up and SCFM numbers a pneumatics tech or shop owner sizes a system with. The receiver-size endpoint gives the tank you need to ride out a demand burst: volume = demand (free-air CFM) × minutes × 14.7 ÷ the usable pressure window (max − min) — pulling 20 CFM for a minute over a 175-to-100 psi window wants about a 30-gallon receiver, the buffer that lets the pump catch up. The pumpup endpoint gives the time to raise a receiver from one pressure to another: volume × pressure rise ÷ (14.7 × compressor CFM), so a 60-gallon tank from 100 to 175 psi on a 15 CFM compressor takes about 2.7 minutes. The scfm endpoint corrects actual CFM to standard CFM for the inlet conditions — SCFM = ACFM × (inlet pressure ÷ 14.696) × (528 ÷ inlet temperature in Rankine) — so a compressor at 5,000 feet delivers about 17 % fewer SCFM than at sea level, the reason you size tools on SCFM, not the nameplate. Everything is computed locally and deterministically, so it is instant and private. Ideal for pneumatics and shop-air apps, compressor-sizing and tool-demand tools, industrial-air calculators, and trade aids. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Estimates — duty cycle and the pump curve shift real numbers.

api.oanor.com/compressor-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for chmod API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call chmod API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for chmod 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 chmod API cost?
chmod API has a free tier with 100 calls / month. Paid plans start at €0.90 / 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 chmod API GDPR-compliant?
All requests to chmod 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/chmod-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/chmod-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/chmod-api/SOME_PATH");
curl_setopt($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/chmod-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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