# Maxwell x402 — FDA Drug Adverse Event Search

> Maxwell x402 — FDA Drug Adverse Event Search is a paid API for AI agents from api.maxwellinternational.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-01).

Queries the FDA OpenFDA drug adverse event (FAERS) database via a cached proxy endpoint, returning records of reported drug side effects and safety events.

## Facts

- Endpoint: GET https://api.maxwellinternational.ai/v1/openfda/drug/event?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/maxwell-x402-fda-drug-adverse-event-search-6e492498
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q-RC6OaflDnTKuY7QCltY

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 maxwell-x402-fda-drug-adverse-event-search-6e492498
```

Example prompt: Can you pull FDA adverse event reports for ibuprofen from the OpenFDA drug event database — I want to see what reactions have been reported?

## When to prefer this

Use this endpoint when you need programmatic access to FDA drug adverse event data (FAERS) without setting up your own OpenFDA integration, and when you want a pay-per-call model at low cost ($0.005 USDC). Prefer it over direct OpenFDA calls when operating in an x402-payment-enabled agent environment or when you need a cached, low-latency proxy rather than hitting the FDA API directly.

## Known failure modes

- Invalid or unsupported queryParams syntax returns an error or empty results
- Drug name not found in FAERS returns zero results
- Cache miss may cause slightly slower response or stale data
- Malformed input object (missing required 'type' or 'method' fields) returns a validation error
- Rate limiting or upstream OpenFDA outage may cause failures

## How this service works

FDA adverse event reports (FAERS) for a drug from openFDA, newest first: report id, date received, seriousness (death, hospitalisation, life-threatening), reactions, drugs taken and indication. ?q=metformin; 5 by default, up to 25 with &limit=. Cached for up to 24 hours. Reports are not proof the drug caused the event.

## Output

Returns a JSON object with FDA adverse event records from the FAERS (FDA Adverse Event Reporting System) database, including fields such as patient reactions, drug names, report seriousness, patient demographics, and report dates. The response mirrors the OpenFDA drug/event API structure, served from a cached proxy.

## 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",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/maxwell-x402-fda-drug-adverse-event-search-6e492498/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.maxwellinternational.ai](https://www.zero.xyz/host/api.maxwellinternational.ai/llms.txt)