Monitoring · x402

Uniform integers in [min, max] derived from ONE verified randomness draw by rejection s…

Uniform integers in [min, max] derived from ONE verified randomness draw by rejection sampling (never modulo bias) — up to 1000 per request. The response carries the raw draw, the node's source/health/attestation and the exact rule, so you can recompute every…

by animica.dev · discovered, not yet claimed by its owner · updated 2026-08-22

Not responding. This endpoint did not answer its last liveness check (2026-10-13). It may be temporarily down.

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: animica · bazaar · discovery

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/7517.json for the price and payment options.
Pay. Call GET https://animica.dev/x402/random/int. 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, animica:1, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.005808 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, animica:1
Uptime: 0 of the last 1 checks answered
Calls (30d): 3 · 1 unique payers (third-party data from the public x402 Bazaar)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.005808	0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD	60s
exact	animica:1 animica:1	ANM	68989547038	anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5808",
    "amountUsd": 0.005808,
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "animica:1",
    "payTo": "anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga",
    "asset": "ANM",
    "amount": "68989547038",
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

{
  "animica": {
    "catalog": "https://animica.dev/.well-known/x402",
    "content_type": "application/json",
    "currency": "USDC",
    "description": "Uniform integers in [min, max] derived from ONE verified randomness draw by rejection sampling (never modulo bias) — up to 1000 per request. The response carries the raw draw, the node's source/health/attestation and the exact rule, so you can recompute every integer offline.",
    "documentation": "https://animica.dev/x402#product-random_int",
    "free_trial": {
      "endpoint": "POST /x402/random/int/trial",
      "limit_per_day": 3,
      "note": "Same code and same response shape as the paid endpoint. No payment, no payment headers. Quota is per client per UTC day; when it is spent this endpoint says so and points back here.",
      "price": "0",
      "url": "https://animica.dev/x402/random/int/trial"
    },
    "name": "Uniform random integers",
    "openapi": "https://animica.dev/x402/openapi.json",
    "price": "0.005808",
    "product": "random_int",
    "provider": "Animica",
    "terms": {
      "amount_atomic": "5808",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "chain_id": 8453,
      "network": "eip155:8453",
      "pay_to": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
      "scheme": "exact"
    },
    "x402_version": 2
  },
  "bazaar": {
    "discoverable": true,
    "info": {
      "input": {
        "body": {
          "count": 3,
          "max": 6,
          "min": 1
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "attestation": {
            "alg": "ed25519",
            "attested": false,
            "backend": "software",
            "digest_hex": "14a2636cf09e18539ab6ed62de65af350c2f6014d269b74d127fc1604c7aa68a",
            "public_key_hex": "8a2228f4bde8f72964a7ff4aa759f24932ae1cccd9462ad94ca6e508d6b87a64",
            "signature_hex": "bee4d32ee31dd92b07f1eee3113ed722c3c96c5fae98c509bcca8f66a5ceaff3eb4a6cd41cd97fc32deebdeeab18b4affea467549dd4ef387ddbdae6d415e900"
          },
          "bytes": 32,
          "derivation": {
            "algorithm": "uniform-int-rejection-sampling",
            "domain": "animica/qrng/public/v1",
            "entropy_hex": "8e8d85d9c03247ffdff7b3db1c917b7a0e97a569e8cf098071dd91cc9121ae55",
            "kind": "range",
            "recompute": {
              "beacon_hex": "8e8d85d9c03247ffdff7b3db1c917b7a0e97a569e8cf098071dd91cc9121ae55",
              "kind": "range",
              "output": [
                5,
                1,
                2
              ],
              "params": {
                "count": 3,
                "hi": 6,
                "lo": 1
              },
              "request_id": "",
              "round_id": 0
            },
            "request_id": "",
            "rules": {
              "seed": "seed = sha3_256(\"animica/qrng/public/v1\" || \"|k:\" || kind || \"|r:\" || request_id || \"|b:\" || bytes(randomness))",
              "stream": "stream = sha3_256(seed || be8(counter)) for counter = 0,1,2,… concatenated; consumed left to right, never reused",
              "uniform_int": "randbelow(n): k = floor((bitlen(n)+7)/8)+1 bytes per attempt, read big-endian as x; limit = 2^(8k); accept when x < limit - (limit mod n); value = x mod n. Rejected attempts still consume their k bytes. n <= 1 consumes nothing and returns 0. This is rejection sampling — plain \"x mod n\" would bias small values."
            },
            "seed_hex": "5fb4cc0e8007c201060453ee9b7cacb38444d32d76d423c61e601117fadd3068",
            "steps": [
              "seed the DRNG with kind=\"range\" and your request_id over the raw randomness above",
              "for i = 0..2: ints[i] = 1 + randbelow(6)"
            ],
            "stream_bytes_consumed": 6,
            "verifier": {
              "api": "AnimicaBeacon.drngSeed(entropy, kind, request_id) + AnimicaBeacon.QDRNG reproduce the stream; AnimicaBeacon.verifyResult(derivation.recompute) === true whenever `recompute` is present",
              "file": "randomness/beacon_api/static/verify.js (Animica repo, github.com/animicaorg) — zero-dependency, runs in Node and the browser",
              "note": "verify.js calls the seed material `beacon` because it was written for beacon rounds. This product is NOT a beacon round: the seed material is the raw `randomness` bytes above, which the node signed (see `verification`)."
            }
          },
          "encoding": "hex",
          "health": {
            "min_entropy_per_byte": 7.8216,
            "passed": true
          },
          "product": "random_int",
          "randomness": "8e8d85d9c03247ffdff7b3db1c917b7a0e97a569e8cf098071dd91cc9121ae55",
          "result": {
            "count": 3,
            "ints": [
              5,
              1,
              2
            ],
            "max": 6,
            "min": 1
          },
          "source": {
            "attested": false,
            "device_path": null,
            "is_hardware": false,
            "is_quantum": false,
            "model": "os.urandom CSPRNG",
            "name": "software-fallback",
            "notes": "non-attested fallback for testing/degraded mode",
            "vendor": "os"
          },
          "verification": {
            "attested": false,
            "method": "signed-digest-attestation",
            "rules": [
              "attestation.digest_hex == sha3_256(bytes(randomness))",
              "ed25519_verify(pubkey=attestation.public_key_hex, message=raw_bytes(attestation.digest_hex), signature=attestation.signature_hex)"
            ],
            "trust_model": "signed by the serving node, not client-recomputable: you trust the node's entropy source, then verify it signed exactly these bytes. Check health.passed and attestation.attested before relying on it.",
            "verifier": "randomness/beacon_api/static/verify.js in the animica repo (github.com/animicaorg) — dependency-free Node module exporting sha3_256; pair with any ed25519 verifier"
          }
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "body": {
              "properties": {
                "count": {
                  "description": "how many integers, 1..1000 (default 1; alias n)",
                  "type": "integer"
                },
                "max": {
                  "description": "upper bound, inclusive (>= min)",
                  "type": "integer"
                },
                "min": {
                  "description": "lower bound, inclusive",
                  "type": "integer"
                },
                "request_id": {
                  "description": "your own tag; mixed into the DRNG seed so you can recompute this exact draw",
                  "type": "string"
                }
              },
              "required": [
                "min",
                "max"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {},
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "discovery": {
    "discoverable": true,
    "info": {
      "entropy": {
        "attested": false,
        "health_passed": true,
        "is_hardware": false,
        "is_quantum": false,
        "min_entropy_per_byte": 7.7725,
        "model": "os.urandom CSPRNG",
        "note": "observed on the gateway's own readiness draw, published unpaid so the trust model is knowable before purchase; the same fields ride verbatim on every paid response",
        "observed_at": "2026-08-22T08:41:02.928Z",
        "signer_backend": "software",
        "source": "software-fallback",
        "vendor": "os"
      },
      "input": {
        "bodyFields": {
          "count": {
            "description": "how many integers, 1..1000 (default 1; alias n)",
            "required": false,
            "type": "integer"
          },
          "max": {
            "description": "upper bound, inclusive (>= min)",
            "required": true,
            "type": "integer"
          },
          "min": {
            "description": "lower bound, inclusive",
            "required": true,
            "type": "integer"
          },
          "request_id": {
            "description": "your own tag; mixed into the DRNG seed so you can recompute this exact draw",
            "required": false,
            "type": "string"
          }
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "description": "result {ints}, randomness (hex raw draw), source, health, attestation, verification, derivation {rules, steps, recompute} for offline recomputation, payment metadata",
        "type": "json"
      }
    }
  }
}

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

null

Examples

curl

curl "https://animica.dev/x402/random/int"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://animica.dev/x402/random/int");
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://animica.dev/x402/random/int")
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: animica.dev
Endpoint: https://animica.dev/x402/random/int
Machine-readable: /resources/7517.json