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API · /cipher-api

Cipher API

healthy 4,732 Subscribers

Encode and decode classical ciphers and alphabets as an API — Morse code, ROT13, the Caesar shift (with any shift 1-25), Atbash, the NATO phonetic alphabet, leetspeak, A1Z26 (letters to numbers) and string reversal. Send text and a cipher and get the transformed string back, or decode it again — most are perfectly reversible. Everything runs locally, so it is fast and always available. Ideal for puzzle and escape-room games, ARGs, treasure hunts, education and coding lessons, retro and hacker-themed UIs, and chat bots. For base64/hex/URL encodings use the Encoding API; for cryptographic hashes use the Hash API.

#cipher #morse #rot13 #caesar #encryption #education
api.oanor.com/cipher-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
76 ms
Server probes · 24h
Subscribers
4,732
active
Total calls
16
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 16,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 16,000 calls/month
  • 2 req/sec
  • 8 ciphers, encode & decode
  • No credit card
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Starter

€2.40 /month

  • 235,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 235k calls/month
  • 8 req/sec
  • Caesar shift control
  • Email support
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Pro

€8.30 /month

  • 920,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 920k calls/month
  • 20 req/sec
  • Games & education apps
  • Priority support
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Mega

€27.60 /month

  • 3,800,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 3.8M calls/month
  • 50 req/sec
  • Bots & high-traffic apps
  • Dedicated SLA
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Classical Music API

The classical-music repertoire as an API — powered by Open Opus, an open catalogue of classical composers and their works. Search composers by name or browse them by musical epoch (Medieval, Renaissance, Baroque, Classical, Romantic and beyond), getting each composer's full name, epoch and birth/death years; then list a composer's works, optionally filtered by genre — orchestral, chamber, keyboard, stage, vocal or opera. From Bach and Mozart to Beethoven's 44 orchestral works, it turns the canon of classical music into a clean search-and-browse API. A classical-music repertoire reference — distinct from commercial music catalogues of tracks, artists and albums. Ideal for classical-music, education, concert-programming, streaming and media applications. Open data from Open Opus (CC-BY-SA / CC0).

api.oanor.com/classical-api

Example Sentences API

Real example sentences with human translations as an API — powered by Tatoeba, the large collaborative corpus of millions of sentences in hundreds of languages, each linked to translations contributed and reviewed by real people (not machine translation). Search for sentences containing a word or phrase in one language and get how they are actually translated into another — perfect for seeing a word "in the wild", building vocabulary and flashcards, or as a human-quality translation aid. Look up any sentence by id to get its full set of translations. From "good morning" in English to its German, French, Spanish, Japanese or Mandarin equivalents, across ISO-639-3 languages, it is ideal for language-learning, vocabulary, flashcard, dictionary-companion and linguistics applications. A human-translated example-sentence corpus — distinct from dictionaries (definitions), machine translation and word APIs. Open data from Tatoeba (CC-BY 2.0 FR / CC0).

api.oanor.com/tatoeba-api

Wikibooks API

Wikibooks as an API — the Wikimedia library of free, open-content textbooks, manuals and learning guides, community-written and freely licensed. Wikibooks covers programming and computer science, mathematics, the natural and social sciences, languages, engineering, cooking, music and much more, organised as books made up of chapters. This API wraps the official Wikibooks MediaWiki service into clean JSON. /v1/search?q=python programming searches the library and returns matching book and chapter titles with a text snippet and word count. /v1/book?title=Python Programming returns a book's overview — its short description, the plain-text introduction, a cover thumbnail and the canonical URL. /v1/chapters?title=Python Programming lists the book's chapters (its subpages, e.g. Python Programming/Operators, Python Programming/Classes), each with the chapter name and URL, so you can browse and present a whole book's structure. Titles are Wikibooks page names; get the exact title from /v1/search first. Ideal for e-learning platforms and study apps, open-education and OER tools, reading lists, and developer/teaching content aggregators. Content is licensed CC BY-SA by the Wikibooks community. Distinct from book-metadata catalogues — this is actual free educational content. For travel guides see the Wikivoyage API, for the encyclopaedia the Wikipedia API.

api.oanor.com/wikibooks-api

Kanji API

The Japanese kanji writing system as an API — every Jōyō, Kyōiku and Jinmeiyō kanji with its on/kun readings, English meanings, JLPT level, school grade, stroke count and newspaper frequency. Look up a single kanji (e.g. 字 → grade 1, JLPT 4, readings ジ / あざ, meanings "character, letter"), find every kanji that shares a kana reading (e.g. かじ), list the vocabulary that uses a given kanji, or pull a whole standard set (Jōyō 2,136 · Kyōiku · grade-1…grade-6 · Jinmeiyō) with paging. Backed by the open KANJIDIC2 / JMdict datasets via kanjiapi.dev. Ideal for Japanese-learning and flashcard apps, SRS/Anki-style study tools, furigana and reading aids, language-education platforms and linguistics research.

api.oanor.com/kanji-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Cipher API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Cipher API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Cipher 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 Cipher API cost?
Cipher API has a free tier with 100 calls / month. Paid plans start at €2.40 / 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 Cipher API GDPR-compliant?
All requests to Cipher 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/cipher-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/cipher-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/cipher-api/SOME_PATH");
curl_setopt($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/cipher-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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