Code execution

Execute Python or JavaScript code in a secure, isolated cloud sandbox. Returns stdout, stderr, and the expression result. No setup needed; pay per call via x402. 30s timeout, 10k char code limit.

Input

Field	Type	Description
code *	string	Source code to execute (max 10,000 chars)
language	string	Language: python (default) or javascript

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

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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