Verifiable Random Tools

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1

0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Payment option 2

0.005 USDC
Atomic price: 5000 · Network: eip155:137 · Asset: USDC · Scheme: exact

Payment option 3

0.005 USDC
Atomic price: 5000 · Network: eip155:42161 · Asset: USDC · Scheme: exact

Payment option 4

0.005 USDC
Atomic price: 5000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2"
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2"
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "5000",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000",
    "payTo": "ASt6xvRyQ7ntERsmcYVMdLqZvz1GEN8Fzexzq62tXrNQ"
  }
]

Observed health

Status

Reachable

Latest latency

10 ms

Average latency

11 ms

HTTP status

405

Last checked

2026-11-02T12:39:39.494Z

Reachability

100% over 10 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "additionalProperties": false,
      "description": "String selection request bound to a future drand round.",
      "properties": {
        "algorithm_version": {
          "default": "drand-hkdf-sha256-v1",
          "description": "Optional version guard; when supplied it must match the server's pinned derivation algorithm.",
          "enum": [
            "drand-hkdf-sha256-v1"
          ],
          "type": "string"
        },
        "client_seed": {
          "default": "",
          "description": "Optional public domain-separation label, not secret entropy.",
          "maxLength": 256,
          "type": "string"
        },
        "count": {
          "description": "Number of values to select.",
          "maximum": 1000,
          "minimum": 1,
          "type": "integer"
        },
        "items": {
          "description": "Candidate strings to select from, at most 131072 UTF-8 bytes combined; duplicate values are allowed and remain distinguishable by original_indices.",
          "items": {
            "maxLength": 256,
            "type": "string"
          },
          "maxItems": 1000,
          "minItems": 1,
          "type": "array"
        },
        "replacement": {
          "default": false,
          "description": "False selects each input position at most once; true makes independent draws and permits repeated positions.",
          "type": "boolean"
        },
        "target_round": {
          "default": 0,
          "description": "0 asks the server to choose the next safe unpublished round; a positive value makes a client_fixed commitment and must still be safely in the future.",
          "minimum": 0,
          "type": "integer"
        }
      },
      "required": [
        "items",
        "count"
      ],
      "type": "object"
    },
    "bodyType": {
      "enum": [
        "json",
        "form-data",
        "text"
      ],
      "type": "string"
    },
    "method": {
      "enum": [
        "POST"
      ],
      "type": "string"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "type": "object"
}

Output schema

{
  "properties": {
    "example": {
      "additionalProperties": false,
      "description": "Verifiable Random result and complete drand derivation transcript.",
      "properties": {
        "algorithm_version": {
          "description": "Pinned canonicalization, derivation, and sampling algorithm version required to reproduce the result.",
          "enum": [
            "drand-hkdf-sha256-v1"
          ],
          "type": "string"
        },
        "beacon": {
          "additionalProperties": false,
          "description": "Locally verified drand Quicknet proof used as the public randomness source.",
          "properties": {
            "chain_hash": {
              "description": "Pinned Quicknet chain hash used to fetch and verify the round.",
              "enum": [
                "52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971"
              ],
              "type": "string"
            },
            "network": {
              "description": "Pinned drand network name.",
              "enum": [
                "quicknet"
              ],
              "type": "string"
            },
            "randomness": {
              "description": "Lowercase hexadecimal randomness derived from the verified signature.",
              "pattern": "^[0-9a-f]{64}$",
              "type": "string"
            },
            "round": {
              "description": "Exact verified Quicknet round used for this result.",
              "minimum": 1,
              "type": "integer"
            },
            "scheduled_time": {
              "description": "Scheduled UTC publication time of the selected round.",
              "format": "date-time",
              "type": "string"
            },
            "scheme": {
              "description": "Pinned drand signature scheme.",
              "enum": [
                "bls-unchained-g1-rfc9380"
              ],
              "type": "string"
            },
            "signature": {
              "description": "Lowercase hexadecimal BLS signature verified against the pinned Quicknet public key.",
              "pattern": "^[0-9a-f]{96}$",
              "type": "string"
            }
          },
          "required": [
            "network",
            "chain_hash",
            "scheme",
            "round",
            "scheduled_time",
            "randomness",
            "signature"
          ],
          "type": "object"
        },
        "example_only": {
          "description": "True only in compiled catalog/keepalive examples; live paid results are false.",
          "type": "boolean"
        },
        "operation": {
          "description": "Random operation performed by this route.",
          "enum": [
            "pick"
          ],
          "type": "string"
        },
        "processed_at": {
          "description": "UTC time when the service accepted the request and committed to the round-selection decision.",
          "format": "date-time",
          "type": "string"
        },
        "request_hash": {
          "description": "Lowercase SHA-256 of your canonical request JSON — retain the exact request body so you can re-derive the result offline.",
          "pattern": "^[0-9a-f]{64}$",
          "type": "string"
        },
        "result": {
          "additionalProperties": false,
          "description": "Operation-specific result derived deterministically from the verified beacon and request hash.",
          "properties": {
            "items": {
              "description": "Selected strings in draw order.",
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "original_indices": {
              "description": "For each selected value, its zero-based position in the input array.",
              "items": {
                "type": "integer"
              },
              "type": "array"
            }
          },
          "required": [
            "items",
            "original_indices"
          ],
          "type": "object"
        },
        "selection_mode": {
          "description": "server_next means the server chose the next safe unpublished round, so you trust its selection chronology; client_fixed means the round is the one you committed to before paying and no other round can be substituted; example_only appears only in catalog examples.",
          "enum": [
            "server_next",
            "client_fixed",
            "example_only"
          ],
          "type": "string"
        },
        "target_round": {
          "description": "Echoes the round actually selected for this result; in server_next mode this is the server-chosen round, not the 0 you sent.",
          "minimum": 1,
          "type": "integer"
        }
      },
      "required": [
        "operation",
        "algorithm_version",
        "selection_mode",
        "target_round",
        "example_only",
        "processed_at",
        "request_hash",
        "beacon",
        "result"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}