# ScriptMasterLabs FDA Warning Letters API

> ScriptMasterLabs FDA Warning Letters API is a paid API for AI agents from acp-x402-scriptmasterlabs.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Retrieves FDA warning letter data via a pay-per-call API settled in USDC on Base via x402 protocol

## Facts

- Endpoint: GET https://acp-x402-scriptmasterlabs.onrender.com/x402/fda-warning-letters?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scriptmasterlabs-fda-warning-letters-api-c2f3de7b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AtwRbj3oH8Ti0zire12tC

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 scriptmasterlabs-fda-warning-letters-api-c2f3de7b
```

Example prompt: Can you pull the latest FDA warning letters — I need to check if there have been any recent enforcement actions against food or pharma manufacturers for compliance violations?

## When to prefer this

Use this endpoint when you need programmatic, pay-per-call access to FDA warning letter data settled in crypto (USDC on Base) without needing a traditional API key or subscription. It is ideal for compliance agents, due diligence workflows, or financial/regulatory research tools that already operate within the x402 micropayment ecosystem. If you need free or high-volume access, the FDA's own public API may be preferable.

## Known failure modes

- Empty response if no matching warning letters found for given filters
- 402 Payment Required if USDC payment via x402 is not properly settled
- 500 server error if the underlying data source is unavailable
- Malformed or sparse response due to loosely defined input schema
- Rate limiting or access errors if payment fails on Base network

## How this service works

Pay-per-call crypto, RWA, federal, SEC, and compliance APIs. Settled in USDC on Base via x402. Hyphen routes only (e.g. /x402/rwa-aggregates, /x402/gas-tracker).

## Output

Returns a list of FDA warning letters including details such as issuing office, company or individual named, subject of the violation, product category, letter date, and relevant regulatory citations. The response reflects publicly available FDA enforcement data served via the ScriptMasterLabs x402 API layer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scriptmasterlabs-fda-warning-letters-api-c2f3de7b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from acp-x402-scriptmasterlabs.onrender.com](https://www.zero.xyz/host/acp-x402-scriptmasterlabs.onrender.com/llms.txt)