Research

{
  "answer": "The main features of the Rust programming language include an emphasis on performance, type safety, concurrency, and memory safety [1]. Rust supports multiple programming paradigms [1]. The language's syntax is heavily influenced by C++ and functional programming languages such as OCaml [2]. Rust has a focus on static typing and a borrow system, similar to other systems programming languages [5]. However, sources [3] and [4] do not provide information about Rust, instead discussing other programming languages, Zig and V, respectively. Overall, the sources suggest that Rust is a systems programming language with a strong focus on safety and performance [1][2][5].",
  "claims_verified": true,
  "claims_verified_reason": null,
  "query": "What are the main features of the Rust programming language?",
  "sources": [
    {
      "published_at": null,
      "source": "wikipedia",
      "title": "Rust (programming language)",
      "url": "https://en.wikipedia.org/wiki/Rust_(programming_language)"
    },
    {
      "published_at": null,
      "source": "wikipedia",
      "title": "Rust syntax",
      "url": "https://en.wikipedia.org/wiki/Rust_syntax"
    },
    {
      "published_at": null,
      "source": "wikipedia",
      "title": "Zig (programming language)",
      "url": "https://en.wikipedia.org/wiki/Zig_(programming_language)"
    },
    {
      "published_at": null,
      "source": "wikipedia",
      "title": "V (programming language)",
      "url": "https://en.wikipedia.org/wiki/V_(programming_language)"
    },
    {
      "published_at": null,
      "source": "wikipedia",
      "title": "Mojo (programming language)",
      "url": "https://en.wikipedia.org/wiki/Mojo_(programming_language)"
    }
  ],
  "synthesis": "llm",
  "timing_ms": {
    "search": 1230,
    "synthesis": 644,
    "total": 2160,
    "verify": 287
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://x402.agentindex.world/research' \
  -H 'content-type: application/json' \
  --data-raw '{"query":"What are the main features of the Rust programming language?"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://x402.agentindex.world/research' \
  -H 'content-type: application/json' \
  --data-raw '{"query":"What are the main features of the Rust programming language?"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

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

// Pays at most $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402.agentindex.world%2Fresearch&method=POST
const res = await pay("https://x402.agentindex.world/research", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "query": "What are the main features of the Rust programming language?"
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://x402.agentindex.world/research",
        json={
            "query": "What are the main features of the Rust programming language?",
        },
    )
    print(res.status_code, res.text)