Which Animica signature scheme you can actually build on

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "6000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "animica:1",
    "payTo": "anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga",
    "asset": "ANM",
    "amount": "64710957722",
    "maxTimeoutSeconds": 60
  }
]

{
  "animica": {
    "catalog": "https://animica.dev/.well-known/x402",
    "content_type": "application/json",
    "currency": "USDC",
    "description": "Which Animica signature scheme you can actually build on. The chain reports three schemes enabled, but two are deprecated commitment stubs the node refuses to make keys for — and 4098 wallets are already stranded on one. Returns the live scheme list plus both id spaces (consensus schemeId and PQ algorithm id 0x1003), key and signature byte sizes, and a usable/not verdict per scheme with its evidence. Buy before generating a key or writing a signer. No model. Free when the chain cannot be read.",
    "documentation": "https://animica.dev/x402#product-chain_signing_policy",
    "name": "Animica signature-scheme advisory",
    "openapi": "https://animica.dev/x402/openapi.json",
    "price": "0.006000",
    "product": "chain_signing_policy",
    "provider": "Animica",
    "terms": {
      "amount_atomic": "6000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "chain_id": 8453,
      "network": "eip155:8453",
      "pay_to": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
      "scheme": "exact"
    },
    "x402_version": 2
  },
  "bazaar": {
    "discoverable": true,
    "info": {
      "input": {
        "body": {
          "include_disabled": true
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "body": {
              "properties": {
                "include_disabled": {
                  "description": "include schemes the chain reports as disabled (default false). Useful when auditing why a historical transaction verifies but a new one is refused.",
                  "type": "boolean"
                }
              },
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "include_disabled": {
                  "description": "same as body.include_disabled for GET callers (\"1\"/\"true\" to include)",
                  "type": "string"
                }
              },
              "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": {
      "input": {
        "bodyFields": {
          "include_disabled": {
            "description": "include schemes the chain reports as disabled (default false). Useful when auditing why a historical transaction verifies but a new one is refused.",
            "required": false,
            "type": "boolean"
          }
        },
        "bodyType": "json",
        "method": "POST",
        "queryParams": {
          "include_disabled": {
            "description": "same as body.include_disabled for GET callers (\"1\"/\"true\" to include)",
            "type": "string"
          }
        },
        "type": "http"
      },
      "output": {
        "description": "as_of {chain_id, read_at, policy_hash, policy_source}; recommended {name, consensus_scheme_id, pq_algorithm_id, pq_algorithm_id_hex, why}; schemes[] {name, consensus_scheme_id, enabled_on_chain, enabled_by_code, enabled_by_policy, reason_if_disabled, pubkey_lengths_bytes, signature_lengths_bytes, pq_algorithm_id, pq_algorithm_id_hex, usable_for_new_keys, verdict, detail, annotated}; warnings[]; id_spaces; what_is_measured; annotation_source; how_to_verify; inference {used:false}.",
        "type": "json"
      }
    }
  }
}

curl "https://animica.dev/x402/chain/signing-policy"
# -> 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/chain/signing-policy");
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/chain/signing-policy")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header