# FDA Warning Letters Feed

> FDA Warning Letters Feed is a paid API for AI agents from ticks.bnm.farm, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns full-body FDA warning letters including firm name, subject, issue date, and source URL

## Facts

- Endpoint: GET https://ticks.bnm.farm/warning-letters
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fda-warning-letters-feed-82982e0f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SAidrs0pBbYWZSrU0dShu

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 fda-warning-letters-feed-82982e0f
```

Example prompt: Pull the latest FDA warning letters so I can see which firms were cited for selling unapproved or misbranded drugs and read the full text of each letter.

## When to prefer this

Choose this endpoint when you need structured, full-body text of FDA warning letters with metadata (firm, subject, date, source URL) in a single API call, rather than scraping FDA.gov directly. Particularly useful for compliance monitoring pipelines, legal due diligence workflows, or regulatory intelligence dashboards that need machine-readable enforcement data at low cost per call.

## Known failure modes

- Network or upstream FDA data unavailability returning a non-200 status
- Payment not processed resulting in 402 response before data is returned
- Empty letters array if no recent warning letters are indexed
- Stale data if the upstream FDA feed has not been refreshed recently

## How this service works

Official public data as JSON. Unpaid paid routes return HTTP 402.

## Output

A JSON object containing an array of warning letters, each with a CMS identifier, full letter body text, firm name, subject classification (e.g. 'Unapproved New Drugs/Misbranded'), issue date, and a direct FDA.gov source URL. The response also includes a product identifier ('fda-warning-letter-bodies') and a status field.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "schema": {
     "type": "object"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "asOf": "2026-08-13",
  "source": "https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/compliance-actions-and-activities/warning-letters",
  "status": "ok",
  "letters": [
   {
    "cms": "722606",
    "body": "WARNING LETTER\nMarch 4, 2026\nRE: Notice of Unlawful Sale of Unapproved and Misbranded Drugs…",
    "firm": "Citra100mg",
    "subject": "Unapproved New Drugs/Misbranded",
    "issuedOn": "2026-03-04",
    "sourceUrl": "https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/warning-letters/citra100mg-722606-03042026"
   }
  ],
  "product": "fda-warning-letter-bodies",
  "records": [
   {
    "id": "citra100mg-722606-03042026",
    "url": "https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/warning-letters/citra100mg-722606-03042026",
    "date": "2026-03-04",
    "firm": "Citra100mg",
    "type": "warning-letter"
   }
  ],
  "fetchedAt": "2026-08-19T15:20:36.317Z",
  "recordCount": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fda-warning-letters-feed-82982e0f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ticks.bnm.farm](https://www.zero.xyz/host/ticks.bnm.farm/llms.txt)