Signed integrity, provenance and freshness receipt for AI-agent JSON

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "1000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "1000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "2Yt1wWXY1R498sDh3UMXpcnwT3qUWyZxLqkGQy51yLCp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "content": {
            "answer": 42
          },
          "sources": [
            {
              "uri": "https://example.com/source"
            }
          ],
          "ttl_seconds": 300
        },
        "bodyType": "json",
        "discoverable": true,
        "method": "POST",
        "type": "http"
      },
      "inputSchema": {
        "properties": {
          "content": {},
          "sources": {
            "items": {
              "properties": {
                "observed_at": {
                  "type": "integer"
                },
                "uri": {
                  "type": "string"
                }
              },
              "required": [
                "uri"
              ],
              "type": "object"
            },
            "maxItems": 32,
            "type": "array"
          },
          "ttl_seconds": {
            "maximum": 86400,
            "minimum": 1,
            "type": "integer"
          }
        },
        "required": [
          "content"
        ],
        "type": "object"
      },
      "output": {
        "example": {
          "confidence": 0.65,
          "content_sha256": "hex",
          "expires_at": 0,
          "issued_at": 0,
          "public_key": "base64url",
          "signature": "base64url",
          "sources_sha256": "hex",
          "version": 1
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object"
    }
  },
  "phion": {
    "buyerClients": "https://phion.systems/clients",
    "freePreview": "https://phion.systems/v1/try/attest",
    "funnelVersion": "1",
    "nextAction": "Select one exact accepts entry, sign it with an x402 v2 client, and retry the same POST with payment-signature.",
    "schemaNormalizer": "https://phion.systems/v1/schema/normalize",
    "supportedNetworks": [
      "eip155:8453",
      "eip155:137",
      "eip155:42161",
      "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
    ],
    "validationBeforeSettlement": true
  }
}

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