ToolVet
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Cron Next

by Saylor Innovations Dev Tools in Developer tools

x402 APIPassing, checked 2 h ago

Cron expression explained in plain English with the next run times in any time zone - validates a 5-field cron and handles DST

GET
https://saylorinnovations.com/api/cron/next
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
253 ms
619 ms slowest 5%
Last check
Passed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed

How to call it

GET https://saylorinnovations.com/api/cron/next

Each call costs $0.01 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://saylorinnovations.com/api/cron/next?count=3&expr=30+9+*+*+mon-fri&from=2026-10-12T12%3A00%3A00Z&tz=America%2FNew_York

Parameters

ParameterTypeRequiredDescription
countstringNoHow many upcoming run times to return, 1 to 20 (default 5) Default: "5".
exprstringNoStandard 5-field cron (minute hour day-of-month month day-of-week) or @hourly, @daily, @weekly, @monthly, @yearly; names like mon-fri and jan are accepted
fromstringNoISO 8601 instant to start from (default: now)
tzstringNoIANA time zone the schedule is evaluated in (default UTC) Default: "UTC".

Example response

The provider's example. We can't check it without paying.

{
  "count": 3,
  "description": "At 09:30 on Monday, Tuesday, Wednesday, Thursday, Friday",
  "expression": "30 9 * * mon-fri",
  "from": "2026-10-12T12:00:00.000Z",
  "next_runs": [
    {
      "local": "2026-10-12T09:30",
      "utc": "2026-10-12T13:30:00.000Z",
      "weekday": "mon"
    },
    {
      "local": "2026-10-13T09:30",
      "utc": "2026-10-13T13:30:00.000Z",
      "weekday": "tue"
    },
    {
      "local": "2026-10-14T09:30",
      "utc": "2026-10-14T13:30:00.000Z",
      "weekday": "wed"
    }
  ],
  "semantics": "standard 5-field cron; when both day-of-month and day-of-week are restricted a day matches if EITHER does (POSIX); local times skipped by a DST gap do not run",
  "timezone": "America/New_York"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/cron/next?count=3&expr=30+9+*+*+mon-fri&from=2026-10-12T12%3A00%3A00Z&tz=America%2FNew_York'

# 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 - 'https://saylorinnovations.com/api/cron/next?count=3&expr=30+9+*+*+mon-fri&from=2026-10-12T12%3A00%3A00Z&tz=America%2FNew_York' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fcron%2Fnext
const res = await pay("https://saylorinnovations.com/api/cron/next?count=3&expr=30+9+*+*+mon-fri&from=2026-10-12T12%3A00%3A00Z&tz=America%2FNew_York");
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://saylorinnovations.com/api/cron/next?count=3&expr=30+9+*+*+mon-fri&from=2026-10-12T12%3A00%3A00Z&tz=America%2FNew_York")
    print(res.status_code, res.text)

Security scan

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Recent checks

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2 days agoPassed402215 ms$0.01