Paid AI-agent access to Blockchain

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x995ffeF6c39234F0bBc95cf0E84FE1B6e6e2d8e0",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bda02913",
    "amount": "1000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "description": "Get BTC address balance",
    "info": {
      "input": {
        "body": {
          "address": "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "format": "application/json",
        "type": "json"
      }
    },
    "method": "POST",
    "schema": {
      "properties": {
        "input": {
          "properties": {
            "body": {
              "properties": {
                "address": {
                  "description": "Bitcoin or Bitcoin Cash address",
                  "type": "string"
                }
              },
              "required": [
                "address"
              ],
              "type": "object"
            },
            "bodyType": {
              "const": "json"
            },
            "method": {
              "const": "POST"
            },
            "type": {
              "const": "http"
            }
          },
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "address": {
                  "type": "string"
                },
                "confirmed": {
                  "description": "Confirmed balance in satoshis",
                  "format": "int64",
                  "type": "integer"
                },
                "received": {
                  "description": "Total received in satoshis",
                  "format": "int64",
                  "type": "integer"
                },
                "txCount": {
                  "description": "Total number of transactions",
                  "type": "integer"
                },
                "unconfirmed": {
                  "description": "Unconfirmed balance in satoshis",
                  "format": "int64",
                  "type": "integer"
                },
                "utxo": {
                  "description": "Number of unspent outputs",
                  "type": "integer"
                }
              },
              "required": [
                "address",
                "confirmed",
                "unconfirmed",
                "utxo",
                "txCount",
                "received"
              ],
              "type": "object"
            },
            "format": {
              "const": "application/json"
            },
            "type": {
              "const": "json"
            }
          },
          "type": "object"
        }
      }
    },
    "serviceName": "Explorer Gateway API",
    "tags": [
      "Bitcoin"
    ]
  }
}

curl "https://api.blockchain.info/explorer-gateway-kt/x402/btc/address"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.blockchain.info/explorer-gateway-kt/x402/btc/address");
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://api.blockchain.info/explorer-gateway-kt/x402/btc/address")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header