Call any x402 endpoint WITHOUT paying and get back what its own 402 challenge says: the re

[
  {
    "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": "Call any x402 endpoint WITHOUT paying and get back what its own 402 challenge says: the real price, asset, network, payTo address, scheme, timeout, and the request schema when the merchant publishes one. Directory listings are written once and go stale; this is the merchant's own current statement of the terms you are about to accept. It also distinguishes the cases a directory cannot: a resource that answers 402 properly, one that is listed as paid but answers WITHOUT payment, one that is listed but gone, and one that simply fails. No payment header is ever sent, so this cannot settle anything, and unknown endpoints are probed with GET — never a write verb with a guessed body.",
    "documentation": "https://animica.dev/x402#product-mesh_probe",
    "name": "x402 Mesh — verify one endpoint before you pay it",
    "openapi": "https://animica.dev/x402/openapi.json",
    "price": "0.005799",
    "product": "mesh_probe",
    "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": {
          "resource": "https://animica.dev/x402/qrng/draw"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "body": {
              "properties": {
                "fresh": {
                  "description": "ignore any cached probe and call it again now (default false)",
                  "type": "boolean"
                },
                "method": {
                  "description": "HTTP verb to probe with. Omit and GET is tried first, then POST with an empty body — a write verb is never guessed at an unknown endpoint",
                  "type": "string"
                },
                "resource": {
                  "description": "absolute http(s) URL of the x402 endpoint to verify",
                  "type": "string"
                }
              },
              "required": [
                "resource"
              ],
              "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": {
          "fresh": {
            "description": "ignore any cached probe and call it again now (default false)",
            "required": false,
            "type": "boolean"
          },
          "method": {
            "description": "HTTP verb to probe with. Omit and GET is tried first, then POST with an empty body — a write verb is never guessed at an unknown endpoint",
            "required": false,
            "type": "string"
          },
          "resource": {
            "description": "absolute http(s) URL of the x402 endpoint to verify",
            "required": true,
            "type": "string"
          }
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "description": "outcome (paywalled|open|dead|error|blocked), http_status, method, price {atomic, usd, asset, network, pay_to, scheme, max_timeout_seconds}, call_spec, accepts[], latency_ms, probed_at, cached",
        "type": "json"
      }
    }
  }
}

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