Verify an FDA drug record: given a claim_type (approval, ndc, or recall) and its identifie

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xf3b36a95913eb2676fcdedb2ba6b0c96ade58de1",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "claim_type": "approval",
          "expected_name": "Lipitor",
          "identifier": "NDA020702"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "canonical": {
            "brand_names": [
              "LIPITOR"
            ],
            "claim_type": "approval",
            "generic_names": [
              "ATORVASTATIN CALCIUM"
            ],
            "identifier": "NDA020702",
            "sponsor_name": "UPJOHN"
          },
          "checks": {
            "exists": true,
            "name_match": true
          },
          "cost": {
            "amount": "0.005",
            "currency": "USDC"
          },
          "evidence": [
            {
              "retrieved_at": "2026-08-30T12:00:00Z",
              "source": "openfda",
              "url": "https://api.fda.gov/drug/drugsfda.json?search=application_number%3A%22NDA020702%22&limit=1"
            }
          ],
          "latency_ms": 260,
          "verdict": "confirmed"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "description": "Provide a claim_type and the matching identifier; expected_name is optional and checked against the canonical record when given.",
              "properties": {
                "claim_type": {
                  "description": "Which FDA record type to check.",
                  "enum": [
                    "approval",
                    "ndc",
                    "recall"
                  ],
                  "type": "string"
                },
                "expected_name": {
                  "description": "Optional name to cross-check: brand/sponsor name for approval/ndc, recalling firm for recall.",
                  "type": "string"
                },
                "identifier": {
                  "description": "The application_number (approval), product_ndc (ndc), or recall_number (recall).",
                  "type": "string"
                }
              },
              "required": [
                "claim_type",
                "identifier"
              ]
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "canonical": {
                  "type": [
                    "object",
                    "null"
                  ]
                },
                "checks": {
                  "type": "object"
                },
                "cost": {
                  "type": "object"
                },
                "evidence": {
                  "type": "array"
                },
                "latency_ms": {
                  "type": "integer"
                },
                "verdict": {
                  "enum": [
                    "confirmed",
                    "contradicted",
                    "unknown"
                  ],
                  "type": "string"
                }
              },
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://goodsong.dev/verify/drug"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

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