[3-LEG] Per-drug shortage chain, one drug (?entity=carboplatin): leading supply narrowing

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x2d16a243ba9facc6ac85519d5efad2149dc4c6c3",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "250000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "8qEn3Y3GPXdQ28LHshPa4UYeD8V38Lq9b4jCRirQAY3n",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "250000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "discoverable": true,
    "info": {
      "input": {
        "example": {
          "entity": "carboplatin",
          "format": "thin"
        },
        "exampleRequest": "/gauge/drug-detail-region?entity=carboplatin&format=thin",
        "method": "GET",
        "queryParams": {
          "entity": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id=<signal_id> -> signals["
        },
        "type": "http"
      },
      "output": {
        "example": {
          "entity": "carboplatin",
          "grade": "screening-level, not decision-grade",
          "legs": {
            "alternative_supply": {
              "band": "multi-source-available",
              "record_hash": "sha256:a87b108234b4838311c621c05cc64421dc61b210f4a2f397b059e9b6313de9d1",
              "source_ref": "https://api.fda.gov/drug/ndc.json + https://rxnav.nlm.nih.gov/ + https://api.fda.gov/drug/shortages.json"
            },
            "alternatives_status": {
              "band": "alternatives-ok",
              "record_hash": "sha256:ca47c731d7f76e830c7a28a54ff412fc05eb5d603dbaa5ab673902d32eaead17",
              "source_ref": "https://rxnav.nlm.nih.gov/ + https://api.fda.gov/drug/shortages.json"
            },
            "status": {
              "band": "severe-shortage",
              "record_hash": "sha256:7db4e125643bd8fe08f2dd8086ca0133592e23c224d50817b858ae6dc0eeebd7",
              "source_ref": "https://api.fda.gov/drug/shortages.json"
            },
            "supply_narrowing": {
              "band": "adequate",
              "record_hash": "sha256:173777a0a9ab8b9afc1328ba9576df77579943a81bb69ff357ff34b005e44761",
              "source_ref": "https://api.fda.gov/drug/shortages.json"
            }
          },
          "name": "Carboplatin",
          "nature": "This API supplies data organisation and trend description only. It is not a recommendation to act; the decision is yours. Purely descriptive - no judgement, no prediction. Official source plus record_hash; verify with the free /gauge/verify.",
          "provenance": {
            "age_hours_now": 5.4,
            "freshness": "fresh",
            "freshness_basis": "cadence=default; fresh<=24h; recent<=192h; dead_source>1440h; age_basis=request-time(now minus observed_at)"
          },
          "scope": {
            "full": "https://api.truthbear.co/scope/v1",
            "intelligence_not_command": true,
            "monitoring_not_forecast": true,
            "verifiability": "unknown"
          }
        },
        "type": "json"
      }
    },
    "outputSchemaRef": "/manifest",
    "priceUsd": "$0.25",
    "priceUsdNumber": 0.25,
    "routeTemplate": "/gauge/drug-detail-region",
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "additionalProperties": false,
              "properties": {
                "entity": {
                  "description": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id=<signal_id> -> signals[0].entities[]",
                  "examples": [
                    "carboplatin",
                    "cisplatin",
                    "oxaliplatin",
                    "methotrexate",
                    "fluorouracil",
                    "epinephrine"
                  ],
                  "type": "string",
                  "x-accepted-values": {
                    "all": "https://api.truthbear.co/schemas/gauge-drug-detail-region.input.json",
                    "shown": 6,
                    "total": 24
                  }
                }
              },
              "required": [
                "entity"
              ],
              "type": "object"
            },
            "type": {
              "const": "http"
            }
          },
          "required": [
            "type",
            "method",
            "queryParams"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {},
            "type": {
              "const": "json"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      }
    }
  }
}

curl "https://api.truthbear.co/gauge/drug-detail-region"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.truthbear.co/gauge/drug-detail-region");
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.truthbear.co/gauge/drug-detail-region")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header