Random bytes from the Animica node's randomness service with a signed digest attestation a

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1786",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "animica:1",
    "payTo": "anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga",
    "asset": "ANM",
    "amount": "31583913197",
    "maxTimeoutSeconds": 60
  }
]

{
  "animica": {
    "catalog": "https://animica.dev/.well-known/x402",
    "content_type": "application/json",
    "currency": "USDC",
    "description": "Random bytes from the Animica node's randomness service with a signed digest attestation and an entropy-health report, 1..1024 bytes per draw. Current trust model, stated up front and in every response: the entropy source is a software CSPRNG (os.urandom) and the signer is a software key, so source.is_quantum=false and attestation.attested=false today; those fields flip truthfully if a hardware/quantum provider is ever connected. The free catalog entry carries the same live entropy block, so you can check the source before paying.",
    "documentation": "https://animica.dev/x402#product-qrng",
    "free_trial": {
      "endpoint": "GET /x402/qrng/draw/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/qrng/draw/trial"
    },
    "name": "Signed random bytes",
    "openapi": "https://animica.dev/x402/openapi.json",
    "price": "0.001786",
    "product": "qrng",
    "provider": "Animica",
    "terms": {
      "amount_atomic": "1786",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "chain_id": 8453,
      "network": "eip155:8453",
      "pay_to": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
      "scheme": "exact"
    },
    "x402_version": 2
  },
  "bazaar": {
    "discoverable": true,
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "bytes": 32
        },
        "type": "http"
      },
      "output": {
        "example": {
          "attestation": {
            "alg": "ed25519",
            "attested": false,
            "backend": "software",
            "digest_hex": "ae7686343e9459d0ddaabb3b80cbdb9d28599eec501ffefe4736b60355f8bf29",
            "public_key_hex": "8a2228f4bde8f72964a7ff4aa759f24932ae1cccd9462ad94ca6e508d6b87a64",
            "signature_hex": "cb219cdb424f395b664076ee57cae6a1245544b53306d35860de4a689ff410dc79d27ffbcfaa927268db47da2c155e06bf0eaf2d838083f81ad1450c1a7cb904"
          },
          "bytes": 32,
          "encoding": "hex",
          "health": {
            "min_entropy_per_byte": 7.8106,
            "passed": true
          },
          "product": "qrng",
          "randomness": "6950d0ba85a3c0a03b193a50e998c6c6b16b53447d0e0ccb68e2a5722ac526ea",
          "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 (gitlab.com/Animica) — 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": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "bytes": {
                  "description": "number of random bytes, 1..1024 (default 32); alias: n",
                  "type": "integer"
                }
              },
              "type": "object"
            },
            "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": 7.8002,
        "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": "2026-09-15T07:21:36.262Z",
        "signer_backend": "software",
        "source": "software-fallback",
        "vendor": "os"
      },
      "input": {
        "alternateMethods": [
          {
            "bodyFields": {
              "bytes": {
                "description": "number of random bytes, 1..1024 (default 32); alias: n",
                "required": false,
                "type": "integer"
              }
            },
            "bodyType": "json",
            "method": "POST",
            "note": "query parameters also work on POST; supplying both with different values is a 400 rather than a silent winner",
            "path": "/x402/qrng"
          }
        ],
        "method": "GET",
        "queryParams": {
          "bytes": {
            "description": "number of random bytes, 1..1024 (default 32); alias: n",
            "type": "integer"
          }
        },
        "type": "http"
      },
      "output": {
        "description": "randomness (hex), bytes, source, health {passed, min_entropy_per_byte}, attestation {alg, public_key_hex, digest_hex, signature_hex, attested}, verification rules, payment metadata",
        "type": "json"
      }
    }
  }
}

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

const res = await fetch("https://animica.dev/x402/qrng/draw");
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://animica.dev/x402/qrng/draw")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header