Cron expression next run times API

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Next run times (in UTC) of a standard 5-field cron expression (minute hour day month weekday; ranges, lists, steps and names like MON or JAN supported). Use to check a schedule before deploying it.

When to use it

See when a cron schedule will run next
Check a schedule before deploying it
Explain a cron line to a user

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Inputs

Name	Type	Description
`expr` (required)	string	The cron expression
`count`	integer	How many runs (1-50, default 5)
`from`	string	Start time, ISO (default now)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/cron/next?expr=*%2F15%209-17%20*%20*%20MON-FRI"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/cron/next?expr=*%2F15%209-17%20*%20*%20MON-FRI&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "expr": "*/15 9-17 * * MON-FRI",
  "next": [
    "2026-10-19T09:00:00.000Z",
    "2026-10-19T09:15:00.000Z"
  ]
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is cron_next, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

How many run times can I get?

Set count; the start time can be set with from.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.