Retrieve a live EVM block header and a bounded list of real transaction hashes by height,

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x8647F7D7a1368a467Ad1FF757fBc2e7167973558",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "block": "latest",
          "chain": "base",
          "transaction_limit": 250
        },
        "type": "http"
      },
      "output": {
        "example": {
          "block": {
            "hash": "0x...",
            "number": "33752215",
            "transaction_count": 184,
            "transactions_truncated": false
          },
          "network": "base",
          "success": true
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "additionalProperties": true,
              "properties": {
                "block": {
                  "description": "Block tag, decimal height, or canonical hex quantity. Defaults to latest.",
                  "type": "string"
                },
                "block_hash": {
                  "description": "Optional 32-byte block hash. Takes precedence over block.",
                  "type": "string"
                },
                "chain": {
                  "description": "base, ethereum, or arbitrum; defaults to base.",
                  "type": "string"
                },
                "transaction_limit": {
                  "description": "Maximum transaction hashes returned, from 0 to 500; defaults to 250.",
                  "type": "integer"
                }
              },
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "additionalProperties": true,
              "properties": {
                "block": {
                  "additionalProperties": true,
                  "properties": {
                    "hash": {
                      "type": "string"
                    },
                    "number": {
                      "type": "string"
                    },
                    "transaction_count": {
                      "type": "integer"
                    },
                    "transactions_truncated": {
                      "type": "boolean"
                    }
                  },
                  "required": [
                    "number",
                    "hash",
                    "transaction_count",
                    "transactions_truncated"
                  ],
                  "type": "object"
                },
                "network": {
                  "type": "string"
                },
                "success": {
                  "type": "boolean"
                }
              },
              "required": [
                "success",
                "network",
                "block"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/evm_block"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/evm_block");
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://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/evm_block")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header