API · x402

Lay out 8-30 clue/answer pairs into one connected freeform crossword (no black squares)…

by Quietforge Docs API · verified provider · updated 2026-09-22

What it does

Lay out 8-30 clue/answer pairs into one connected freeform crossword (no black squares) and return it as JSON: the letter grid, every slot with row/col/direction, standard row-major crossword numbering, Across and Down clue lists and the stats. A verifier proves every run of letters is exactly one supplied answer and every answer appears once. Deterministic per seed. For personalised puzzle gifts, newsletters, classroom sheets and games.

Tags: crossword · puzzle · generator · games · content

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/15981.json for the price and payment options.
Pay. Call GET https://qf-api.quietforge-studio.workers.dev/v1/crossword. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.02 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.02	0x3F5115236f25618c16021E983acaAF2CAaa1A35e	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x3F5115236f25618c16021E983acaAF2CAaa1A35e",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "20000",
    "amountUsd": 0.02,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "type": "object",
  "properties": {
    "title": {
      "type": "string"
    },
    "subtitle": {
      "type": "string"
    },
    "seed": {
      "type": "integer"
    },
    "entries": {
      "type": "integer"
    },
    "rows": {
      "type": "integer"
    },
    "cols": {
      "type": "integer"
    },
    "crossings": {
      "type": "integer"
    },
    "grid": {
      "type": "array",
      "items": {
        "type": "array"
      },
      "description": "rows of cells; letter or null"
    },
    "slots": {
      "type": "array",
      "items": {
        "type": "object"
      }
    },
    "numbering": {
      "type": "array",
      "items": {
        "type": "object"
      }
    },
    "clues": {
      "type": "object",
      "properties": {
        "across": {
          "type": "array"
        },
        "down": {
          "type": "array"
        }
      }
    },
    "verified": {
      "type": "boolean"
    },
    "elapsed_ms": {
      "type": "integer"
    }
  },
  "required": [
    "title",
    "entries",
    "grid",
    "slots",
    "numbering",
    "clues"
  ]
}

Example shape — generated from the schema, not a captured live response

{
  "title": "string",
  "subtitle": "string",
  "seed": 0,
  "entries": 0,
  "rows": 0,
  "cols": 0,
  "crossings": 0,
  "grid": [
    [
      "value"
    ]
  ],
  "slots": [
    {}
  ],
  "numbering": [
    {}
  ],
  "clues": {
    "across": [
      "value"
    ],
    "down": [
      "value"
    ]
  },
  "verified": true,
  "elapsed_ms": 0
}

Examples

curl

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

Details

Provider: Quietforge Docs API
Endpoint: https://qf-api.quietforge-studio.workers.dev/v1/crossword
Machine-readable: /resources/15981.json