Independent due diligence for AI-agent services: x402, A2A, MCP, OpenAPI, ERC-8004, reacha

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "9000",
    "maxTimeoutSeconds": 600
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "url": "https://example-agent.com"
        },
        "bodyType": "json",
        "discoverable": true,
        "method": "POST",
        "type": "http"
      },
      "inputSchema": {
        "properties": {
          "url": {
            "format": "uri",
            "type": "string"
          }
        },
        "required": [
          "url"
        ],
        "type": "object"
      },
      "output": {
        "example": {
          "audit": {
            "checks": [],
            "score": 100,
            "verdict": "pass"
          },
          "receipt": {
            "signature": "base64url"
          }
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object"
    }
  }
}

curl "https://phion.systems/v1/paid/inspect-agent"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://phion.systems/v1/paid/inspect-agent");
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://phion.systems/v1/paid/inspect-agent")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header