# ScriptMasterLabs FDA Warning Letters API

> ScriptMasterLabs FDA Warning Letters API is a paid API for AI agents from acp-x402-discovery.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Retrieves FDA warning letters data via a pay-per-call endpoint settled in USDC on Base via the x402 protocol

## Facts

- Endpoint: GET https://acp-x402-discovery.onrender.com/x402/fda-warning-letters
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scriptmasterlabs-fda-warning-letters-api-bd2fe79a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ujv-MCbt0iAqN5g175lFZ

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-bd2fe79a
```

Example prompt: Can you pull the latest FDA warning letters so I can check if any recent enforcement actions have been issued against pharmaceutical or food companies?

## When to prefer this

Choose this endpoint when you need programmatic, pay-per-call access to FDA warning letter data settled via crypto (USDC on Base) without a subscription, particularly useful for AI agents that need on-demand regulatory compliance lookups for due diligence, risk monitoring, or research workflows. Prefer this over manual FDA.gov searches when automation and structured data output are required.

## Known failure modes

- Payment not settled — x402 payment in USDC on Base must be completed before data is returned
- Empty result set if no matching warning letters are found for the given filters
- Malformed or missing query properties causing a 400-level error
- Service unavailability on the Render-hosted endpoint causing a 503 timeout
- Schema mismatch if the underlying FDA data source changes structure

## 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 collection of FDA warning letters including details such as the issuing office, recipient company or individual, subject matter, date issued, and letter content or reference — enabling regulatory compliance review and enforcement monitoring.

## 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-bd2fe79a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from acp-x402-discovery.onrender.com](https://www.zero.xyz/host/acp-x402-discovery.onrender.com/llms.txt)