oanor
Sign up free
Marketplace Pricing Features Sign in

API · /sudoku-api

Sudoku API

healthy 4,074 Subscribers

Generate, solve and validate Sudoku puzzles through a fast, fully-local API. Create fresh puzzles at four difficulty levels (easy, medium, hard, expert), each guaranteed to have exactly one solution, returned as both an 81-character string and a 9x9 grid alongside the full solution. Solve any valid puzzle with a backtracking engine that also reports whether the solution is unique, and validate a grid to detect rule conflicts and completeness. Inputs accept an 81-character string (0 or . for blanks) or a 9x9 array, by GET or JSON POST. Pure server-side compute with no third-party upstream, so responses are instant and the service is always available. Ideal for puzzle apps and games, newspapers and printables, tutors and training-data generation.

#sudoku #puzzle #game #generator #solver #brain
api.oanor.com/sudoku-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
74 ms
Server probes · 24h
Subscribers
4,074
active
Total calls
12
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 200 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 200 puzzles/month, 2 req/s
  • Generate, solve & validate
  • Unique-solution guarantee
  • No credit card
Sign in to subscribe

Basic

€2.00 /month

  • 10,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 10,000 puzzles/month, 5 req/s
  • All 4 difficulty levels
  • String or 9x9 grid I/O
  • Commercial use, email support
Sign in to subscribe

Pro

€8.00 /month

  • 75,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 75,000 puzzles/month, 15 req/s
  • High-volume generation
  • Uniqueness & conflict detection
  • Priority email support
Sign in to subscribe

Mega

€24.00 /month

  • 400,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 400,000 puzzles/month, 40 req/s
  • App & training-data scale
  • Maximum concurrency
  • Priority support
Sign in to subscribe

Built by

P
PremiumApi

Related APIs

Other APIs with overlapping tags.

Wordle API

A complete toolkit for Wordle-style word games: score a guess against a hidden answer and get the exact green/yellow/grey feedback pattern (with correct duplicate-letter handling), validate any word against the official dictionary, solve a puzzle from the clues collected so far (returns the remaining consistent answers and a suggested next guess that best narrows them down), pull a random answer word, and fetch the deterministic daily word for any date with its puzzle number. Built on the official answer list (2,315 words) and the full set of ~13,000 accepted guesses. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side compute (no third-party upstream), so responses are instant and always available. Ideal for word-game backends, solvers and assistants, bots and educational apps.

api.oanor.com/wordle-api

Poker API

A complete Texas Hold’em toolkit in one fast, fully-local API. Calculate win, tie and equity probabilities for your hole cards against any number of opponents (1–9) on any board — pre-flop, flop, turn or river — using a Monte Carlo simulation with adjustable accuracy. Evaluate the best five-card hand from any five to seven cards and get its rank and tiebreakers, or describe a hand in plain language. Cards use the familiar notation (As, Td, 9h, 2c) and every endpoint works by GET or JSON POST. Pure server-side compute with no third-party upstream, so responses are instant and the service is always available. Ideal for poker trainers and study tools, game developers, hand-history trackers and odds widgets.

api.oanor.com/poker-api

Password API

A fast, fully-local password toolkit: generate cryptographically-secure random passwords (configurable length, character classes and exclude-similar), estimate password strength (entropy bits, a 0-4 score, character-class breakdown, common-password detection, an offline crack-time estimate and actionable feedback), and create memorable diceware-style passphrases. Built on Node crypto, no third-party upstream, and inputs are never logged — so responses are instant, private and always available. Ideal for signup and account flows, admin tools, password managers and security features.

api.oanor.com/password-api

Barcode API

Generate barcodes as PNG images — EAN-13, EAN-8, UPC-A/E, Code 128, Code 39, ITF-14, ISBN and 2D codes (QR, Data Matrix, PDF417, Aztec) — returned as base64 or a raw image, with adjustable size and human-readable text. Fully server-side. Perfect for retail, inventory, shipping labels, ticketing and asset tracking.

api.oanor.com/barcode-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Sudoku API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Sudoku API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Sudoku 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 Sudoku API cost?
Sudoku API has a free tier with 100 calls / month. Paid plans start at €2.00 / 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 Sudoku API GDPR-compliant?
All requests to Sudoku 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/sudoku-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/sudoku-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/sudoku-api/SOME_PATH");
curl_setopt($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/sudoku-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

Ratings

Sign in to rate.

No reviews yet.

Discussion

Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.

Sign in to start a thread or reply.

Sign in

New thread

/ 4000

📌 Pinned 🔒 Locked

·

· ·

/ 4000

🔒 This thread is locked — no new replies.

  • No threads yet — start the discussion.

Support

Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.

Sign in to open a support ticket.

Sign in

Open new ticket

Describe what you need help with. The provider team gets an email and replies on the ticket page.

  • No tickets yet for this API.

Subscription active — calls can start immediately.

Send your first request —

Subscription active — copy a snippet and fire off your first call.