verified owner x402 eip155:8453

Generate 1-20 classic 9x9 sudoku puzzles with a proven-unique solution, 180-degree symmetr

Generate 1-20 classic 9x9 sudoku puzzles with a proven-unique solution, 180-degree symmetric givens and a technique grade (easy/medium/hard/expert) decided by a human-style solver, not by clue count. Deterministic for a given seed. Returns puzzle + solution strings and the techniques each puzzle needs.

10000 (raw units)

price

—

calls / 30d

—

unique payers

2026-09-21

updated

Provider

Quietforge Docs API · verified

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x3F5115236f25618c16021E983acaAF2CAaa1A35e",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "type": "object",
  "properties": {
    "seed": {
      "type": "integer"
    },
    "count": {
      "type": "integer"
    },
    "format": {
      "type": "string"
    },
    "grading": {
      "type": "object"
    },
    "symmetry": {
      "type": "string"
    },
    "unique_solution": {
      "type": "boolean"
    },
    "puzzles": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "n": {
            "type": "integer"
          },
          "level": {
            "type": "string",
            "enum": [
              "easy",
              "medium",
              "hard",
              "expert"
            ]
          },
          "givens": {
            "type": "integer"
          },
          "techniques": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "puzzle": {
            "type": "string",
            "description": "81 chars, row by row, 0 = empty"
          },
          "solution": {
            "type": "string",
            "description": "81 chars"
          }
        },
        "required": [
          "n",
          "level",
          "givens",
          "puzzle",
          "solution"
        ]
      }
    },
    "elapsed_ms": {
      "type": "integer"
    }
  },
  "required": [
    "seed",
    "count",
    "puzzles"
  ]
}

Use it

curl

curl "https://qf-api.quietforge-studio.workers.dev/v1/sudoku"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://qf-api.quietforge-studio.workers.dev/v1/sudoku");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://qf-api.quietforge-studio.workers.dev/v1/sudoku")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/15739.json, and this resource appears in /discovery/resources and /discovery/search.