Koan

Last 30 days

Uptime

100%

Response time

122 ms typical, 122 ms slowest 5%

Last check

5 h ago

Next check

any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://penny402.fun/koan" \
  -H "content-type: application/json" \
  -d '{}'

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fpenny402.fun%2Fkoan
const res = await pay("https://penny402.fun/koan", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({}),
});
console.log(await res.json());

Example input

{}

Example output

{
  "date": "2026-10-09",
  "koan": "One short oblique line about the work, drawn for your address and this date.",
  "mechanic": "drawn from this UTC date's pool, indexed by the `payer` above — that field is the exact key, and the same key draws this same koan until midnight UTC, then a new one. It is a koan: it resolves nothing on purpose.",
  "payer": "0x0000000000000000000000000000000000000000"
}

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