Code execution (Pro)

Execute Python or JavaScript code in a secure, isolated cloud sandbox (Pro tier). Same as /api/code-run but with 60s timeout and 50k char code limit for longer computations. Returns stdout, stderr, and the expression result.

Input

Example output

{
  "language": "python",
  "stdout": "Hello from Agent402!\n",
  "stderr": "",
  "result": null,
  "error": null
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/code-run-pro \
  -H "Content-Type: application/json" \
  -d '{"code":"print('Hello from Agent402!')","language":"python"}'

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/code-run-pro", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "code": "print('Hello from Agent402!')",
    "language": "python"
  }),
});

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