Skill: Answer-a-question with sources

Bundled execution of the Answer-a-question with sources workflow — The 'research a question, return an answer with citations' workflow. Brave answer for the AI-synthesized take with citations, Brave web for the canonical SERP, Brave news for time-sensitive context, then a deterministic web-fetch + extract pass on the top citations to verify the answer hasn't hallucinated. Five tools, one cited paragraph, every claim traced back to a fetched URL. One x402 payment runs 5 underlying tools (answer, search, search-news, extract, extract-entities); partial-success per step.

Input

Field	Type	Description
question *	string	the research question to answer with citations

Example output

{
  "pack": "search-and-cite",
  "args": {
    "question": "What is the Sahm Rule and has it triggered recently?"
  },
  "steps": [
    {
      "slug": "answer",
      "ok": true,
      "result": {}
    },
    {
      "slug": "search",
      "ok": true,
      "result": {}
    },
    {
      "slug": "search-news",
      "ok": true,
      "result": {}
    },
    {
      "slug": "extract",
      "ok": true,
      "result": {}
    },
    {
      "slug": "extract-entities",
      "ok": true,
      "result": {}
    }
  ],
  "summary": "5/5 steps succeeded"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/skill/search-and-cite \
  -H "Content-Type: application/json" \
  -d '{"question":"What is the Sahm Rule and has it triggered recently?"}'

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/skill/search-and-cite", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "question": "What is the Sahm Rule and has it triggered recently?"
  }),
});

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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