Pre-payment guard for x402 agents: free POST /v1/intel/preflight before spending, paid sig

[
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "GFpLvocNdEjnSsLH3VJQL6wGcjGxTbUBrj6fqN3Qe1Gs",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "50000",
    "maxTimeoutSeconds": 45
  }
]

{
  "bazaar": {
    "exampleUrl": "https://intel.twzrd.xyz/v1/intel/trust/GFpLvocNdEjnSsLH3VJQL6wGcjGxTbUBrj6fqN3Qe1Gs",
    "info": {
      "input": {
        "discoverable": true,
        "method": "GET",
        "queryParams": {},
        "type": "http"
      },
      "output": {
        "example": {
          "paid": true,
          "receipt": {
            "leaf": "0x<keccak256 of the preimage>",
            "preimage": {
              "settlement_tx": "<your on-chain x402 payment>"
            },
            "signature": "<Ed25519 signature over the leaf>",
            "signing_alg": "ed25519",
            "version": 6
          },
          "score": 61.8,
          "score_version": "intel_renorm_v1_1"
        },
        "type": "json"
      }
    },
    "routeTemplate": "/v1/intel/trust/:pubkey",
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "headers": {
              "additionalProperties": {
                "type": "string"
              },
              "type": "object"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "pathParams": {
              "additionalProperties": {
                "type": "string"
              },
              "type": "object"
            },
            "queryParams": {
              "additionalProperties": {
                "type": "string"
              },
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "twzrd_decision_bind": {
    "correlation_id": "a7c0264b-680b-4b38-ac56-29f6ea3aff73",
    "outcome_attestation": "TWZRD:AO_DECISION_OUTCOME_V1",
    "schema": "twzrd.decision_bind.v1"
  }
}

curl "https://intel.twzrd.xyz/v1/intel/trust/:pubkey"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://intel.twzrd.xyz/v1/intel/trust/:pubkey");
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://intel.twzrd.xyz/v1/intel/trust/:pubkey")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header