# TruthBear Drug Shortage Detail – 3-Leg Chain > TruthBear Drug Shortage Detail – 3-Leg Chain is a paid API for AI agents from api.truthbear.co, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14). Runs a sequential three-leg supply-chain analysis for a single drug, connecting labeler availability narrowing to FDA shortage status per NDC to confirmed affected presentations. ## Facts - Endpoint: GET https://api.truthbear.co/gauge/drug-detail-region - Price: $0.25/call - Payment: x402 - Status: unknown - Last checked: 2026-09-14 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/truthbear-drug-shortage-detail-3-leg-chain-3aa1844c - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rFB69skvMYXMD93iAEHa3 Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability truthbear-drug-shortage-detail-3-leg-chain-3aa1844c ``` Example prompt: Can you run the full 3-leg drug shortage chain for carboplatin — I want to see how many labelers are still active versus listed, whether the FDA has flagged any NDCs as in shortage, and which specific presentations are confirmed affected? ## When to prefer this Use this endpoint when you need a structured, multi-signal confirmation of drug shortage status that goes beyond a simple FDA lookup — specifically when you want to correlate labeler supply narrowing with official NDC shortage listings and presentation-level confirmation in a single chained call. Prefer it over raw openFDA queries when you need a confidence-gated, sequential analysis rather than a single data point. ## Known failure modes - 422 no_charge returned when no data exists for the given entity — not billed - Invalid or unrecognized entity name returns an error or empty result - openFDA upstream outage may reduce the number of legs that can be populated, lowering confidence score - Querying a drug not in the monitored catalog returns no meaningful chain data ## How this service works [3-LEG] Per-drug shortage chain, one drug (?entity=carboplatin): leading supply narrowing - available labelers against total listed -> current current FDA shortage status per NDC -> realized affected presentations (confirmation gate). A chain, not one reading: confidence = how many legs are lit, in order. Sources: openFDA. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.25 per call. ## Output A JSON object with up to three sequentially gated legs: (1) active labelers vs. total listed labelers indicating supply narrowing; (2) current FDA shortage status per NDC; (3) confirmed affected drug presentations. The confidence field indicates how many legs returned data (0–3). Returns HTTP 422 with no charge if no data is available. ## Request schema (JSON Schema) ```json { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "type": "object", "required": [ "type", "method", "queryParams" ], "properties": { "type": { "const": "http" }, "method": { "enum": [ "GET" ], "type": "string" }, "queryParams": { "type": "object", "required": [ "entity" ], "properties": { "entity": { "type": "string", "examples": [ "carboplatin", "cisplatin", "oxaliplatin", "methotrexate", "fluorouracil", "epinephrine" ], "description": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id= -> signals[0].entities[]", "x-accepted-values": { "all": "https://api.truthbear.co/schemas/gauge-drug-detail-region.input.json", "shown": 6, "total": 24 } } }, "additionalProperties": false } } }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "const": "json" }, "example": {} } } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "legs": { "status": { "band": "severe-shortage", "source_ref": "https://api.fda.gov/drug/shortages.json", "record_hash": "sha256:7db4e125643bd8fe08f2dd8086ca0133592e23c224d50817b858ae6dc0eeebd7" }, "supply_narrowing": { "band": "adequate", "source_ref": "https://api.fda.gov/drug/shortages.json", "record_hash": "sha256:173777a0a9ab8b9afc1328ba9576df77579943a81bb69ff357ff34b005e44761" }, "alternative_supply": { "band": "multi-source-available", "source_ref": "https://api.fda.gov/drug/ndc.json + https://rxnav.nlm.nih.gov/ + https://api.fda.gov/drug/shortages.json", "record_hash": "sha256:a87b108234b4838311c621c05cc64421dc61b210f4a2f397b059e9b6313de9d1" }, "alternatives_status": { "band": "alternatives-ok", "source_ref": "https://rxnav.nlm.nih.gov/ + https://api.fda.gov/drug/shortages.json", "record_hash": "sha256:ca47c731d7f76e830c7a28a54ff412fc05eb5d603dbaa5ab673902d32eaead17" } }, "name": "Carboplatin", "grade": "screening-level, not decision-grade", "scope": { "full": "https://api.truthbear.co/scope/v1", "verifiability": "unknown", "monitoring_not_forecast": true, "intelligence_not_command": true }, "entity": "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": { "freshness": "fresh", "age_hours_now": 5.4, "freshness_basis": "cadence=default; fresh<=24h; recent<=192h; dead_source>1440h; age_basis=request-time(now minus observed_at)" } } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/truthbear-drug-shortage-detail-3-leg-chain-3aa1844c/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from api.truthbear.co](https://www.zero.xyz/host/api.truthbear.co/llms.txt)