# Kit Rx Drug Data: FDA Labels, NDC, Shortages & NADAC

> Drug data for AI agents: FDA drug labels, NDC lookup and conversion, drug shortages and recalls, CMS NADAC acquisition prices, paid per call over x402.

Drug cards from FDA labeling and NLM RxNorm, NDC product records and 10/11-digit conversion, FDA drug shortage and recall reports, and CMS NADAC per-unit acquisition prices. Each call is one x402 v2 payment in USDC on Base, Polygon, Arbitrum, Avalanche or Sei; no signup or API key. Requests that fail or match nothing are not charged.

## Payment

- Protocol: x402 v2, scheme exact, USDC on Base (eip155:8453); also accepted: eip155:137,eip155:42161,eip155:43114,eip155:1329 (Polygon, Arbitrum, Avalanche, Sei). payTo 0xAf8E0A8a8A0A8f65831b2dD0FFe0c1B804698D70
- An unpaid request returns HTTP 402 with the payment requirements in the PAYMENT-REQUIRED header.
- Only 2xx responses are settled. 400 (invalid input), 404 (no match) and 5xx (upstream down) are free.
- A request with no query parameters runs the documented example query and says so in notes (defaulted_to_example: true).
- Machine-readable: https://rx.kit-rx.com/openapi.json, https://rx.kit-rx.com/.well-known/x402, https://rx.kit-rx.com/catalog.json
- MCP: remote Streamable HTTP server at https://rx.kit-rx.com/mcp (MCP Registry name com.kit-rx.api/kitrx). Each route is a tool; paid tools use the x402 MCP transport (_meta["x402/payment"]); kitrx_catalog is free.
- Human docs: https://rx.kit-rx.com/docs (one page per endpoint). Agent skill: https://rx.kit-rx.com/.well-known/agent-skills/index.json

## Endpoints

- GET https://rx.kit-rx.com/v1/rx/drug ($0.02) params: name. Drug card for a generic or brand name: NLM RxNorm concept (RxCUI, ingredients, brands); one openFDA label (brand checked against RxNorm ingredients, else single-ingredient full prescribing info, most common route, earliest NDA/BLA) with clipped boxed warning, indications, dosing, contraindications, warnings, interactions, pregnancy, lactation, special-formulation flag, other routes, DailyMed link; DEA schedule and status (NDC data); FDA shortage and 2-year recall summaries.
- GET https://rx.kit-rx.com/v1/rx/shortages ($0.01) params: q?, status?, limit?. FDA drug shortage records from openFDA, most recently updated first, with optional drug-name and status filters (current, to be discontinued, resolved). Name filters match every word in generic name, brand or presentation, plus RxNorm ingredients for brand names. Entries give generic name, presentation, dosage form, status, availability, related info, reason, therapeutic category, company, ISO dates and package NDC, plus counts by status and an in_shortage flag.
- GET https://rx.kit-rx.com/v1/rx/recalls ($0.01) params: q?, months?, classification?, limit?. FDA drug recall enforcement reports from openFDA, newest report first, filtered by optional drug, brand or firm text (every word must match; brand names also match their RxNorm ingredients), look-back months and FDA classification (I, II, III). Entries include recall number, classification, status, product description, reason, recalling firm, distribution pattern, initiation and report dates (ISO) and voluntary or mandated status, plus counts by classification.
- GET https://rx.kit-rx.com/v1/rx/ndc-convert ($0.002) params: ndc. Converts a National Drug Code between FDA 10-digit layouts (4-4-2, 5-3-2, 5-4-1) and the HIPAA 11-digit 5-4-2 form, dashed or undashed. Ambiguous undashed 10-digit input is resolved against NLM RxNav by checking all three possible layouts. Returns ndc11, ndc11_dashed, ndc10, product_ndc, segment_format, resolution method, candidate layouts, and RxNav status (ACTIVE, OBSOLETE, ALIEN, UNKNOWN) with RxCUI and concept name.
- GET https://rx.kit-rx.com/v1/rx/ndc ($0.02) params: ndc. Full product record for one package NDC: normalized NDC forms; RxNav status, RxCUI, concept name and history; labeler, marketing category, status and dates, application number, DEA schedule, imprint, color, shape and size from RxNav; brand and generic name, dosage form, route, active ingredients with strengths and package description from the openFDA NDC Directory; latest CMS NADAC unit cost; openFDA recall enforcement reports from the last 36 months.
- GET https://rx.kit-rx.com/v1/rx/price ($0.01) params: q, strength?. Latest CMS NADAC (National Average Drug Acquisition Cost) per-unit prices for a drug name, brand name or NDC, from data.medicaid.gov (monthly pharmacy invoice survey, weekly files). Groups by NADAC description, pricing unit (EA, ML, GM), generic or brand rate class and OTC flag, each with min, median and max unit cost across NDCs, effective date, NDC count, sample NDCs, and a 30-unit acquisition cost for per-dose EA items. Single-source generics map to RxNorm brand names.

## Data sources

US FDA (openFDA), NLM RxNav/RxNorm, CMS NADAC (data.medicaid.gov), Wikidata, GLEIF, SEC EDGAR, US Census Geocoder, USGS EPQS, NOAA NWS, RDAP registries, Cloudflare DNS-over-HTTPS, and the checked websites themselves. Reports are informational summaries; verify critical decisions against the primary source.