Verifiable RNG — cryptographically-random integer(s) signed by the treasury key

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "6apuZvJQ51Led9iEjnHw6f5jfnXL4qjt8S1h58PeXzuR",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6",
    "asset": "0x431D5dfF03120AFA4bDf332c61A6e1766eF37BDB",
    "amount": "100000000000000000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "category": "gaming",
    "description": "Verifiable RNG — cryptographically-random integer(s) signed by the treasury key. Drop-in VRF for game studios. $0.001 USDC.",
    "discoverable": true,
    "info": {
      "input": {
        "body": {
          "count": 1,
          "high": 100,
          "label": "treasure_drop_42",
          "low": 1
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "commitment": null,
          "count": 1,
          "domain": "anchor-x402/roll/v1",
          "input_hash": "f4a1c5e3b9d8a2e0c7b4f6d9e1a3c8b5f7d2e4a9c1b6e8f3d5a7c2b4e9f1d6a8",
          "label": "treasure_drop_42",
          "range": [
            1,
            100
          ],
          "result": [
            47
          ],
          "result_hash": "8a6d1f9e4b2c7a3e5f0c9b8a4d2f6e1c3b7a5f9d2e8c4b6a1f3e7d5c9b2a4f6e",
          "scheme": "eip191",
          "signature": "0x6b3e2a7c…",
          "signer": "0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6"
        },
        "type": "json"
      }
    },
    "name": "Roll",
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "commitment": {
                  "description": "Optional 32-byte hex pre-commitment from the caller.",
                  "type": "string"
                },
                "count": {
                  "default": 1,
                  "description": "How many integers to sample. 1-100.",
                  "maximum": 100,
                  "minimum": 1,
                  "type": "integer"
                },
                "high": {
                  "description": "Inclusive high bound. Must be >= low.",
                  "type": "integer"
                },
                "label": {
                  "description": "Optional caller tag, included in the signed payload.",
                  "maxLength": 200,
                  "type": "string"
                },
                "low": {
                  "description": "Inclusive low bound of the integer range.",
                  "type": "integer"
                }
              },
              "required": [
                "low",
                "high"
              ]
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "builder-code": {
    "info": {
      "a": "bc_kxz79e8i"
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "additionalProperties": false,
      "properties": {
        "a": {
          "description": "App builder code",
          "pattern": "^[a-z0-9_]{1,32}$",
          "type": "string"
        },
        "s": {
          "description": "Service builder codes",
          "items": {
            "pattern": "^[a-z0-9_]{1,32}$",
            "type": "string"
          },
          "type": "array"
        },
        "w": {
          "description": "Wallet builder code",
          "pattern": "^[a-z0-9_]{1,32}$",
          "type": "string"
        }
      },
      "type": "object"
    }
  }
}

curl "https://api.anchor-x402.com/v1/roll"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

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

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