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API · /tldr-api

tldr CLI Help API

healthy 4,183 Subscribers

Simplified, example-driven help for the command line as an API — the community tldr-pages project, 7,045 command-line tools across Linux, macOS, Windows and more. Instead of dense man pages, every command (tar, git, ffmpeg, curl, docker, ssh, awk, …) comes back as a short description plus a handful of practical, copy-paste example commands with placeholders. Look up a command, search commands by name or description, filter by platform, or fetch a random command. Ideal for terminals, IDEs, chatbots, developer tools, onboarding and learning. Open data from tldr-pages (CC-BY).

#tldr #cli #command-line #cheatsheet #developer-tools #terminal
api.oanor.com/tldr-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
81 ms
Server probes · 24h
Subscribers
4,183
active
Total calls
200
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 3,400 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 3,400 calls/month
  • 2 req/sec
  • Command + search + random
  • No credit card
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Starter

€3.90 /month

  • 48,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 48k calls/month
  • 8 req/sec
  • Platform filters
  • Email support
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Pro

€12.10 /month

  • 239,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 239k calls/month
  • 20 req/sec
  • Terminals / IDEs / chatbots
  • Priority support
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Mega

€33.00 /month

  • 1,195,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.19M calls/month
  • 50 req/sec
  • Developer-tools platform
  • Dedicated SLA
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ASCII Art API

Turn text into ASCII-art banners as an API, with 300+ classic FIGlet fonts (Standard, Slant, Big, Ghost, Doom, 3D-ASCII, Banner and many more). Send a word or short phrase and a font and get back ready-to-paste ASCII art, with control over output width and the letter-spacing layout. Browse and search the full font catalogue. Rendering runs entirely on the engine — no third-party service, so it is fast and always available. Ideal for CLI tools and terminal output, README and changelog headers, build banners, chat and Discord bots, retro UIs and any place a plain string deserves a little flourish.

api.oanor.com/asciiart-api

GST API

Validate and decode Indian GSTINs (the 15-character Goods & Services Tax Identification Number) instantly and entirely offline. The validate endpoint checks the structure and recomputes the official GSTIN check digit — the base-36 weighted algorithm the GSTN itself uses — and confirms the embedded state code is real, returning a clear valid/invalid verdict with the specific reasons a number fails. The decode endpoint breaks a GSTIN into its parts: the GST state/UT code and its name, the embedded 10-character PAN, the PAN holder type (company, individual/proprietor, firm/LLP, HUF, trust, government and more, read from the PAN's 4th letter), the entity registration number, the default 'Z' slot and the check digit. A states endpoint returns the full GST state-code reference for building dropdowns and lookups. Everything is pure computation — no network call, no key, no cache — so it is fast and private, ideal for checkout and onboarding forms, invoicing and e-invoice/e-way-bill pipelines, vendor master data cleansing and bulk validation. A structural GSTIN validator and decoder — distinct from EU VAT-number validation (vat), IBAN bank-account validation (iban) and card-number checks (creditcard). Note: this verifies the number's structure and check digit, not whether it is actively registered in the GSTN portal. No upstream key, no cache.

api.oanor.com/gst-api

ads.txt API

Fetch and evaluate any publisher's ads.txt / app-ads.txt — the IAB authorized-digital-sellers standard. Pass a domain and the check endpoint fetches its ads.txt server-side, then returns every seller record parsed into its fields — advertising system, the publisher's seller/account id, the DIRECT or RESELLER relationship and the optional certification-authority id (TAG-ID) — alongside counts (direct, reseller, distinct ad systems) and the declared variables OWNERDOMAIN, MANAGERDOMAIN, CONTACT and SUBDOMAINS. The verify endpoint answers the one question programmatic-advertising integrations actually ask: is this advertising system, with this publisher id, authorized to sell this domain's inventory? — returning an authorized boolean and the matching records. A missing file is reported as found:false (not an error), and soft-404 HTML pages are detected and rejected so you never parse a "page not found" as records. The request is made server-side and private or internal targets are refused (SSRF-guarded). Built for ad-tech supply-chain verification, SSP/DSP onboarding checks, anti-fraud and inventory audits. An ads.txt seller-authorization checker — distinct from the security-contact file reader (securitytxt), the robots.txt crawlability evaluator (robots) and the sitemap parser (sitemap). No upstream key, no cache.

api.oanor.com/adstxt-api

Sitemap API

Fetch and parse an XML sitemap (the sitemaps.org protocol). Pass a sitemap URL and the parse endpoint fetches it — following redirects and transparently gunzipping .gz sitemaps — and returns its type: a urlset with every URL and its lastmod, changefreq and priority, or a sitemapindex listing the child sitemaps, with offset/limit paging for large files. The urls endpoint goes further: when the sitemap is an index it fetches the child sitemaps too and flattens every page URL into a single list, with a configurable cap on URLs and child sitemaps and a truncated flag so you stay in control. The request is made server-side and private or internal targets are refused (SSRF-guarded). Built for SEO audits, building crawl queues and content inventories, change monitoring and migration checks. A sitemap fetcher and parser — distinct from generic XML-to-JSON conversion (xml), the robots.txt evaluator (robots) and the on-page SEO audit (seo). No upstream key, no cache.

api.oanor.com/sitemap-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for tldr CLI Help API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call tldr CLI Help API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for tldr CLI Help 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 tldr CLI Help API cost?
tldr CLI Help API has a free tier with 100 calls / month. Paid plans start at €3.90 / 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 tldr CLI Help API GDPR-compliant?
All requests to tldr CLI Help 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/tldr-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/tldr-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/tldr-api/SOME_PATH");
curl_setopt($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/tldr-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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