# USP Reference Standards Catalog Search

> USP Reference Standards Catalog Search is a paid API for AI agents from api.healthtravel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Searches the official USP Store catalog for Reference Standards, returning catalog details, pricing, stock status, lot info, and monograph associations for pharmaceutical substances.

## Facts

- Endpoint: GET https://api.healthtravel-api.workers.dev/api/health/usp-monographs-standards?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/usp-reference-standards-catalog-search-5a38c3b4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7UPvfQdAVGygqfvQHM3_H

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 usp-reference-standards-catalog-search-5a38c3b4
```

Example prompt: Can you search the USP Reference Standards catalog for aspirin and show me the catalog number, price, stock status, and current lot number?

## When to prefer this

Use this endpoint when you need authoritative USP Reference Standards catalog data — including pricing, stock availability, lot numbers, and monograph associations — sourced directly from the official USP Store. Prefer this over general chemical databases (PubChem, ChemSpider) when the specific need is procurement-readiness, regulatory compliance, or verification against USP-recognized standards.

## Known failure modes

- No results returned for obscure or misspelled substance names
- CAS number not indexed if non-standard format is used
- Pagination out of bounds returns empty result set
- Store link may be stale if USP catalog is updated
- Price and stock status may lag real-time inventory by a short delay
- Rate limiting or payment failure returns an error with no data

## How this service works

USP Reference Standards catalog search (official USP Store): total matches and per item the catalog number, name, package size, CAS number, chemical name, molecular formula, category (e.g. Active Pharmaceutical Ingredients), product line, price (USD), in-stock / ready-to-ship flags, current lot number and release date, associated monograph, therapeutic categories and store link. From store.usp.org.

## Output

Returns total match count and, for each matched reference standard: catalog number, name, package size, CAS number, chemical name, molecular formula, category (e.g. Active Pharmaceutical Ingredients), product line, price in USD, in-stock and ready-to-ship flags, current lot number and release date, associated monograph name, therapeutic categories, and a direct link to the USP Store product page.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "query"
     ],
     "properties": {
      "limit": {
       "type": "number",
       "description": "Results to return, 1-50 (default 20)"
      },
      "query": {
       "type": "string",
       "description": "Substance, CAS number or catalog number, e.g. aspirin, 50-78-2, 1044006"
      },
      "offset": {
       "type": "number",
       "description": "Results to skip for paging (default 0)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/usp-reference-standards-catalog-search-5a38c3b4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.healthtravel-api.workers.dev](https://www.zero.xyz/host/api.healthtravel-api.workers.dev/llms.txt)