FDA drug adverse events

Top reported adverse reactions for a drug from the FDA FAERS database (openFDA), ranked by report count — a fast read on a drug's real-world safety signal. Live FDA data, no key. ?drug=aspirin&limit=10

Input

Example output

{
  "drug": "aspirin",
  "count": 2,
  "topReactions": [
    {
      "reaction": "NAUSEA",
      "reports": 4211
    },
    {
      "reaction": "DYSPNOEA",
      "reports": 3987
    }
  ],
  "source": "api.fda.gov (openFDA FAERS, public domain)"
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/drug-adverse-events?drug=aspirin&limit=10"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/drug-adverse-events?drug=aspirin&limit=10");

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