Prediction-market exchanges and entity metadata (Lukka VASP)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x995c0abdcd2ad76548e5f7deb54d32549b2b781f",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "limit": "10",
          "offset": "0"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "exchanges": [
            {
              "entityCode": "KALSHI",
              "letterGrade": "B2",
              "lukkaVasp": "Kalshi",
              "lukkaVaspId": "LV40C47CFE3",
              "primaryLocation": "United States",
              "startTs": "2022-05-01T00:00:00Z",
              "status": "Active",
              "vaspClassification": "Centralized",
              "vaspScore": "59.9225",
              "vaspType": "Prediction",
              "website": "https://kalshi.com/"
            }
          ]
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "limit": {
                  "description": "Maximum number of exchanges to return.",
                  "type": "string"
                },
                "offset": {
                  "description": "Zero-based pagination offset.",
                  "type": "string"
                },
                "primary_location": {
                  "description": "Optional location filter.",
                  "type": "string"
                },
                "vasp_classification": {
                  "description": "Optional VASP classification filter.",
                  "type": "string"
                },
                "vasp_score": {
                  "description": "Optional exact VASP score filter.",
                  "type": "string"
                },
                "vasp_score_gt": {
                  "description": "Optional lower bound for VASP score.",
                  "type": "string"
                },
                "vasp_score_lt": {
                  "description": "Optional upper bound for VASP score.",
                  "type": "string"
                },
                "vast_type": {
                  "description": "Legacy exchange-type filter.",
                  "type": "string"
                }
              },
              "required": [
                "limit",
                "offset"
              ],
              "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"
    }
  }
}

curl "https://api.predictionmarketdata.io/exchanges"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.predictionmarketdata.io/exchanges");
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.predictionmarketdata.io/exchanges")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header