# FDA Warning Letters Feed

> FDA Warning Letters Feed is a paid API for AI agents from api.companyrecords-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).

Returns the latest FDA warning letters from the FDA listing page, including company name, issuing center, violation subject, and issue date with links.

## Facts

- Endpoint: GET https://api.companyrecords-api.workers.dev/api/gov/fda-warning-letters?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fda-warning-letters-feed-83b7b068
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DcEzBi5k6VeS7RLcD667Q

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-83b7b068
```

Example prompt: Can you pull the latest FDA warning letters and filter them to show any involving dietary supplement violations — give me up to 15 results?

## When to prefer this

Use this endpoint when you need quick, structured access to the most recent FDA warning letters without scraping the FDA website yourself. Ideal for compliance monitoring, due diligence workflows, or regulatory news aggregation where only the latest enforcement actions matter. Not suitable when you need full letter text, historical data beyond the first listing page, or comprehensive enforcement history for a company.

## Known failure modes

- FDA website unavailable or changed structure — endpoint may return stale or empty data
- Company name filter too short (under 2 chars) or too long (over 60 chars) returns validation error
- Limit parameter outside 1–20 range may be rejected or clamped
- No matching results for a specific company name filter — returns empty letters array
- Payment failure (x402) if USDC balance insufficient

## How this service works

Pay-per-call company registry, government, legal and B2B data tools for AI agents, from official registers and public sources. Payment: x402, USDC on Base, Solana, Arc, Polygon, Arbitrum, Monad, World Chain, Optimism, Avalanche, Celo or Stellar, or RLUSD/XRP on the XRP Ledger. No signup, no API key; a failed call is not charged.

## Output

A JSON object containing a total count, the FDA source URL, a checkedAt timestamp, and an array of warning letter records each with: company name, issuing FDA center or program, violation subject category, issue date (YYYY-MM-DD), and a direct URL to the letter on FDA.gov. Returns the first listing page only (up to 20 results); does not include full letter text or historical records.

## 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": [],
     "properties": {
      "q": {
       "type": "string",
       "description": "Optional company-name filter, 2 to 60 characters"
      },
      "limit": {
       "type": "string",
       "description": "Letters to return, 1 to 20 (default 10)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "total": 10,
  "source": "https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/compliance-actions-and-activities/warning-letters",
  "letters": [
   {
    "url": "https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/warning-letters/rohto-pharmaceutical-co-ltd-733215-10142026",
    "issued": "2026-10-14",
    "company": "Rohto Pharmaceutical Co., Ltd.",
    "subject": "CGMP/Finished Pharmaceuticals/Unapproved New Drug/Misbranded/Adulterated",
    "issuingCenter": "Center for Drug Evaluation and Research (CDER)"
   },
   {
    "url": "https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/warning-letters/psyched-wellness-ltd-730137-09292026",
    "issued": "2026-09-29",
    "company": "Psyched Wellness Ltd.",
    "subject": "Dietary Supplement/Adulterated",
    "issuingCenter": "Human Foods Program"
   }
  ],
  "checkedAt": "2026-10-23T09:37:06.239Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fda-warning-letters-feed-83b7b068/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.companyrecords-api.workers.dev](https://www.zero.xyz/host/api.companyrecords-api.workers.dev/llms.txt)