Password generator

Generate cryptographically random passwords. ?length=8..128 (default 24), ?symbols=true|false (default true), ?count=1..20. Send GET /api/password with no required fields (3 optional) and pay $0.001 per call over x402 or MPP, or call it free by solving a proof-of-work challenge. It returns a JSON object with passwords and entropyBits.

Category: Generators & IDs · Tags: password random generator security · Also found as: join-code invite-code one-time-code random-code

TRY IN PLAYGROUND →

Parameters

Example request

curl -i "https://agent402.tools/api/password?length=32&symbols=true&count=1"

Without payment this returns HTTP 402 Payment Required with the exact price for password; any x402 v2 or MPP client pays it and retries.

Example response

{
  "passwords": [
    "k9#mP2…"
  ],
  "entropyBits": 190
}

From an MCP client

catalog.call {
  "slug": "password",
  "params": {
    "length": "32",
    "symbols": "true",
    "count": "1"
  }
}

On the hosted connector at https://agent402.tools/mcp, catalog.call runs password free (rate-limited, no wallet). Local install: npx -y agent402-mcp.

Errors and behavior

• Every field is optional. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Free tier: no outbound network call leaves the server for this tool, so proof-of-work (16 leading zero bits of sha256) pays for it.
• A POST with a JSON body to /api/password is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/password?length=32&symbols=true&count=1");

No wallet? Pay with compute

Fetch a challenge, solve the sha256 puzzle (16 leading zero bits, a fraction of a second of CPU), and resend with the X-Pow-Solution header:

import { createHash } from "node:crypto";
const lz = (b) => { let t = 0; for (const x of b) { if (!x) { t += 8; continue; } t += Math.clz32(x) - 24; break; } return t; };
const c = await (await fetch("https://agent402.tools/api/pow/challenge?slug=password")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/password?length=32&symbols=true&count=1", { method: "GET", headers: { "X-Pow-Solution": c.token + ":" + n } });

Part of these workflows

Password generator is one step in this skill pack, each sold as a single call:

• User onboarding - Take a signup form submission and run the full onboarding workup deterministically: validate the email, score the chosen password, mint a stable internal ID, derive a URL-safe handle from the display name, generate a recovery / API secret, hash the password for storage, and verify the 2FA setup code. One pass, every step a pure-CPU call.

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