Summary
Parses cron expressions into plain English and returns the next N scheduled run times, with full timezone support via IANA names. Exposes a single tool, explain_cron, that handles 5-field POSIX cron syntax and clamps output to 100 future executions. Runs on Cloudflare Workers with a pay-per-call model at €0.01 per request, no subscription or expiration. Useful when you need to validate scheduling logic, debug cron strings in CI/CD pipelines, or surface upcoming job times to end users without bundling a parser into your own stack. Non-2xx responses are refunded automatically, and the service logs zero PII since inputs are just cron strings and timezone identifiers.
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cron-explainer
A tiny pay-per-call API that parses cron expressions, returns the next N fire times, and produces a short English description. Timezone-aware (IANA).
Live: https://cron-explainer.cron-explainer-prod.workers.dev/ Pricing: 0.01 EUR per successful call, prepaid via Stripe Checkout in packs of 500 / 5,000 / 50,000 calls. Non-2xx responses are refunded. No subscription. Keys never expire.
Quick start
- Get a key at https://cron-explainer.cron-explainer-prod.workers.dev/ (Stripe Checkout, €5 minimum).
- Copy the key — it's shown exactly once.
- Call the API:
curl -X POST https://cron-explainer.cron-explainer-prod.workers.dev/v1/explain \
-H "content-type: application/json" \
-H "x-api-key: $YOUR_KEY" \
-d '{"cron":"0 9 * * 1-5","tz":"Europe/Lisbon","n":3}'
Response:
{
"input": {"cron":"0 9 * * 1-5","tz":"Europe/Lisbon","n":3},
"valid": true,
"description": "At 09:00, Monday through Friday",
"next": ["2026-04-24T08:00:00.000Z","2026-04-27T08:00:00.000Z","2026-04-28T08:00:00.000Z"],
"flags": {"dst_transition_ahead": false, "ambiguous": false, "notes": []},
"errors": []
}
Check remaining balance:
curl -H "x-api-key: $YOUR_KEY" \
https://cron-explainer.cron-explainer-prod.workers.dev/v1/balance
MCP
The server is listed on the official MCP registry as
io.github.IdoAzaCalls/cron-explainer with a Streamable HTTP endpoint at
POST /mcp. It exposes one tool, explain_cron. Pass your x-api-key as
an HTTP header on the MCP transport; billing is identical to the REST path.
Registry entry: https://registry.modelcontextprotocol.io/v0/servers?search=cron-explainer
Endpoints
| Method | Path | Purpose |
|---|---|---|
POST | /v1/explain | Parse + describe + next fire times (billed) |
GET | /v1/balance | Remaining balance for an x-api-key |
POST | /v1/checkout | Create a Stripe Checkout Session |
GET | /v1/schema | JSON Schema for request/response |
POST | /mcp | MCP Streamable HTTP (JSON-RPC 2.0) |
GET | /.well-known/mcp.json | Static tool manifest |
GET | /health | Liveness probe |
GET | /legal/{tos,privacy,disclaimer,notices} | Legal docs |
Limits
- Cron: 5-field POSIX/Vixie syntax (minute, hour, day-of-month, month, day-of-week).
- Timezones: IANA names (e.g.
Europe/Lisbon,America/Los_Angeles). Defaults toUTC. nclamps to[1, 100].- Best-effort accuracy. See
/legal/disclaimerfor warranty terms. - Zero PII: inputs are cron strings and IANA timezones only. Request and response bodies are never logged.
Stack
TypeScript on Cloudflare Workers. Cron parsing via
croner (MIT). English descriptions via
cronstrue (MIT). Full NOTICE
text at /legal/notices.
Contact
azariaido@gmail.com — billing issues, bug reports, custom pricing.
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
