Verify a post-quantum signature (ML-DSA-65 / Dilithium3 / SPHINCS+ as enabled by chain pol

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5799",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "animica:1",
    "payTo": "anim1zqpsmegc0qcvzjfukm89xs0zeu3eqyyyel7kelehuszvwfarqypky2gr946ga",
    "asset": "ANM",
    "amount": "68878682293",
    "maxTimeoutSeconds": 60
  }
]

{
  "animica": {
    "catalog": "https://animica.dev/.well-known/x402",
    "content_type": "application/json",
    "currency": "USDC",
    "description": "Verify a post-quantum signature (ML-DSA-65 / Dilithium3 / SPHINCS+ as enabled by chain policy) against a message and public key, using the same verifier the Animica chain itself uses to admit transactions. Useful when an agent must check a PQ-signed attestation without shipping a post-quantum library of its own. A signature that does not verify is a SUCCESSFUL call answering ok:false - you paid for the answer, and \"invalid\" is an answer. Only an inability to perform the check is treated as a failure.",
    "documentation": "https://animica.dev/x402#product-pq_verify",
    "name": "Post-quantum signature verification",
    "openapi": "https://animica.dev/x402/openapi.json",
    "price": "0.005799",
    "product": "pq_verify",
    "provider": "Animica",
    "terms": {
      "amount_atomic": "5799",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "chain_id": 8453,
      "network": "eip155:8453",
      "pay_to": "0x5D17c40FD6b119dc6006C4Ab3C20a917FCaB2aCD",
      "scheme": "exact"
    },
    "x402_version": 2
  },
  "bazaar": {
    "discoverable": true,
    "info": {
      "input": {
        "body": {
          "alg_id": 4099,
          "message": "00",
          "public_key": "00",
          "signature": "00"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "body": {
              "properties": {
                "alg_id": {
                  "description": "scheme id - 4099 (0x1003) is ML-DSA-65, the only scheme that can spend on Animica",
                  "type": "integer"
                },
                "message": {
                  "description": "hex-encoded message bytes",
                  "type": "string"
                },
                "public_key": {
                  "description": "hex-encoded public key",
                  "type": "string"
                },
                "sign_hash": {
                  "description": "hex domain/sign-hash bytes, when the scheme binds one",
                  "type": "string"
                },
                "signature": {
                  "description": "hex-encoded signature",
                  "type": "string"
                }
              },
              "required": [
                "alg_id",
                "message",
                "signature",
                "public_key"
              ],
              "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": {
      "input": {
        "bodyFields": {
          "alg_id": {
            "description": "scheme id - 4099 (0x1003) is ML-DSA-65, the only scheme that can spend on Animica",
            "required": true,
            "type": "integer"
          },
          "message": {
            "description": "hex-encoded message bytes",
            "required": true,
            "type": "string"
          },
          "public_key": {
            "description": "hex-encoded public key",
            "required": true,
            "type": "string"
          },
          "sign_hash": {
            "description": "hex domain/sign-hash bytes, when the scheme binds one",
            "required": false,
            "type": "string"
          },
          "signature": {
            "description": "hex-encoded signature",
            "required": true,
            "type": "string"
          }
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "description": "ok (the verdict), reason, scheme_id, scheme_name, pub_fingerprint, sizes, verified_at",
        "type": "json"
      }
    }
  }
}

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