Roundhouse AI

Animica

Fisher-Yates permutation of your list (or of 1..N), up to 10000 items, derived from ONE verified randomness draw. Returns the permutation of 0-based indices plus the shuffled items, with the exact swap-and-byte-consumption rule so you can recompute it offline.

Searchofflineeip155:8453Exactvia cdp
https://animica.dev/x402/random/shuffle
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 26 snapshots so far.
$3.23
Verified settled volume
273 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0054
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-20 04:13Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required. Your request as sent is not usable: send a JSON object body with content-type: application/json",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "decimals": 6
      },
      "payTo": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://animica.dev/x402/random/shuffle",
      "description": "Fisher-Yates permutation of your list (or of 1..N), up to 10000 items, derived from ONE verified randomness draw. Returns the permutation of 0-based indices plus the shuffled items, with the exact swap-and-byte-consumption rule so you can recompute it offline.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "bodyFields": {
            "n": {
              "type": "integer",
              "required": false,
              "description": "shuffle 1..n instead of a supplied list (1..10000); supply exactly one of items or n"
            },
            "items": {
              "type": "array",
              "required": false,
              "description": "the list to shuffle, 1..10000 entries (any JSON values)"
            },
            "request_id": {
              "type": "string",
              "required": false,
              "description": "your own tag; mixed into the DRNG seed"
            }
          }
        },
        "output": {
          "type": "json",
          "description": "result {permutation (0-based indices), items (shuffled), count}, randomness, source, health, attestation, verification, derivation {rules, steps, recompute}, payment metadata"
        }
      },
      "maxAmountRequired": "4878",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "ANM",
      "extra": {
        "unit": "nANM",
        "native": true,
        "chain_id": 1,
        "decimals": 9,
        "rate_side": "bid",
        "how_to_pay": "Sign a TRANSFER of at least `amount` nANM to payTo on Animica (chainId 1) and send the signed raw transaction as payload.rawTransaction. You pay the chain fee; we submit it. Because we sponsor no gas on this lane, it is priced 25% below the USDC price.",
        "rate_source": "nonkyc",
        "genesis_hash": "0xa0892158cf997c56e91d0aa12e60c36037dae34800a2b54111a8fa17ec88b7de",
        "price_display": "84.208103130 ANM",
        "usd_equivalent": "0.003658",
        "usd_list_price": "0.004878",
        "discount_percent": 25,
        "rate_observed_at": "2026-09-09T14:15:35.000Z",
        "rate_usd_per_anm": "0.00004344"
      },
      "payTo": "anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga",
      "scheme": "exact",
      "network": "animica:1",
      "mimeType": "application/json",
      "resource": "https://animica.dev/x402/random/shuffle",
      "description": "Fisher-Yates permutation of your list (or of 1..N), up to 10000 items, derived from ONE verified randomness draw. Returns the permutation of 0-based indices plus the shuffled items, with the exact swap-and-byte-consumption rule so you can recompute it offline.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "bodyFields": {
            "n": {
              "type": "integer",
              "required": false,
              "description": "shuffle 1..n instead of a supplied list (1..10000); supply exactly one of items or n"
            },
            "items": {
              "type": "array",
              "required": false,
              "description": "the list to shuffle, 1..10000 entries (any JSON values)"
            },
            "request_id": {
              "type": "string",
              "required": false,
              "description": "your own tag; mixed into the DRNG seed"
            }
          }
        },
        "output": {
          "type": "json",
          "description": "result {permutation (0-based indices), items (shuffled), count}, randomness, source, health, attestation, verification, derivation {rules, steps, recompute}, payment metadata"
        }
      },
      "maxAmountRequired": "84208103130",
      "maxTimeoutSeconds": 60
    }
  ],
  "freeTrial": {
    "url": "https://animica.dev/x402/random/shuffle/trial",
    "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",
    "endpoint": "POST /x402/random/shuffle/trial",
    "limit_per_day": 3
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "n": 5
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json"
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "body": {
                "type": "object",
                "properties": {
                  "n": {
                    "type": "integer",
                    "description": "shuffle 1..n instead of a supplied list (1..10000); supply exactly one of items or n"
                  },
                  "items": {
                    "type": "array",
                    "description": "the list to shuffle, 1..10000 entries (any JSON values)"
                  },
                  "request_id": {
                    "type": "string",
                    "description": "your own tag; mixed into the DRNG seed"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              }
            }
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {}
            }
          }
        }
      },
      "discoverable": true
    }
  },
  "x402Version": 1
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.00541USDC≈ $0.00541 USD
on Base · exact scheme

Pay 0.00541 USDC on Base to 0x5D17…B2aCD. The signed payment is good for 1 minute.

Paid to
0x5D17…B2aCD
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
5410 smallest units
52626799844units
on animica:1 · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
anim1z…946ga
Token contract
ANM
Payment window
1 minute
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "decimals": 6
    },
    "payTo": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
    "amount": "5410",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "ANM",
    "extra": {
      "unit": "nANM",
      "native": true,
      "chain_id": 1,
      "decimals": 9,
      "rate_side": "bid",
      "how_to_pay": "Sign a TRANSFER of at least `amount` nANM to payTo on Animica (chainId 1) and send the signed raw transaction as payload.rawTransaction. You pay the chain fee; we submit it. Because we sponsor no gas on this lane, it is priced 25% below the USDC price.",
      "rate_source": "nonkyc",
      "genesis_hash": "0xa0892158cf997c56e91d0aa12e60c36037dae34800a2b54111a8fa17ec88b7de",
      "price_display": "52.626799844 ANM",
      "usd_equivalent": "0.004057",
      "usd_list_price": "0.005410",
      "discount_percent": 25,
      "rate_observed_at": "2026-08-20T04:12:11.000Z",
      "rate_usd_per_anm": "0.00007709"
    },
    "payTo": "anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga",
    "amount": "52626799844",
    "scheme": "exact",
    "network": "animica:1",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "n": 5
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json"
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "body": {
              "type": "object",
              "properties": {
                "n": {
                  "type": "integer",
                  "description": "shuffle 1..n instead of a supplied list (1..10000); supply exactly one of items or n"
                },
                "items": {
                  "type": "array",
                  "description": "the list to shuffle, 1..10000 entries (any JSON values)"
                },
                "request_id": {
                  "type": "string",
                  "description": "your own tag; mixed into the DRNG seed"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            }
          }
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {}
          }
        }
      }
    },
    "discoverable": true
  },
  "animica": {
    "name": "Verifiable shuffle",
    "price": "0.005410",
    "terms": {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "pay_to": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
      "scheme": "exact",
      "network": "eip155:8453",
      "chain_id": 8453,
      "amount_atomic": "5410"
    },
    "catalog": "https://animica.dev/.well-known/x402",
    "openapi": "https://animica.dev/x402/openapi.json",
    "product": "random_shuffle",
    "currency": "USDC",
    "provider": "Animica",
    "free_trial": {
      "url": "https://animica.dev/x402/random/shuffle/trial",
      "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",
      "endpoint": "POST /x402/random/shuffle/trial",
      "limit_per_day": 3
    },
    "description": "Fisher-Yates permutation of your list (or of 1..N), up to 10000 items, derived from ONE verified randomness draw. Returns the permutation of 0-based indices plus the shuffled items, with the exact swap-and-byte-consumption rule so you can recompute it offline.",
    "content_type": "application/json",
    "x402_version": 2,
    "documentation": "https://animica.dev/x402#product-random_shuffle"
  },
  "discovery": {
    "info": {
      "input": {
        "type": "http",
        "method": "POST",
        "bodyType": "json",
        "bodyFields": {
          "n": {
            "type": "integer",
            "required": false,
            "description": "shuffle 1..n instead of a supplied list (1..10000); supply exactly one of items or n"
          },
          "items": {
            "type": "array",
            "required": false,
            "description": "the list to shuffle, 1..10000 entries (any JSON values)"
          },
          "request_id": {
            "type": "string",
            "required": false,
            "description": "your own tag; mixed into the DRNG seed"
          }
        }
      },
      "output": {
        "type": "json",
        "description": "result {permutation (0-based indices), items (shuffled), count}, randomness, source, health, attestation, verification, derivation {rules, steps, recompute}, payment metadata"
      },
      "entropy": {
        "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",
        "model": "os.urandom CSPRNG",
        "source": "software-fallback",
        "vendor": "os",
        "attested": false,
        "is_quantum": false,
        "is_hardware": false,
        "observed_at": "2026-08-20T04:13:04.848Z",
        "health_passed": true,
        "signer_backend": "software",
        "min_entropy_per_byte": 7.7981
      }
    },
    "discoverable": true
  }
}

Provenance

Seen in the source catalog
2026-08-20 04:13Z
Last indexed by Roundhouse
2026-09-19 03:50Z
Last enriched (probe, favicon, geo)
2026-09-23 20:45Z
x402 version
2
Max timeout
60s
Liveness probe
HTTP 0
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 26 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service Animica and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Animica'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://animica.dev/x402/random/shuffle, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.