# iCal Create (.ics Generator)

> iCal Create (.ics Generator) is a paid API for AI agents from ical.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Generates a valid .ics calendar file from event fields such as summary, start/end time, location, and description.

## Facts

- Endpoint: POST https://ical.openverbs.com/v1/create
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ical-create-ics-generator-72b26473
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qukl-ZMXJp5JW2aOJc0PB

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ical-create-ics-generator-72b26473 -d '<json body>'
```

Example prompt: Create an .ics calendar file for 'Team Strategy Meeting' starting Monday June 9th at 10am and ending at 11:30am, at 'HQ Conference Room B', with the description 'Quarterly planning session for all team leads'.

## When to prefer this

Use this endpoint when you need to programmatically generate a standards-compliant .ics file from structured event data — e.g. in automated workflows that send calendar invites, confirmation emails with attachments, or any agent that needs to output a downloadable calendar event. Prefer this over manual iCal construction to avoid formatting errors and ensure RFC 5545 compliance.

## Known failure modes

- Missing required 'summary' field returns a validation error
- Missing required 'start' field returns a validation error
- Invalid ISO datetime format for start/end causes a parse error
- summary exceeding 1000 characters is rejected
- description exceeding 10000 characters is rejected
- Payment not included or insufficient (x402) results in a 402 response

## How this service works

Build a valid .ics document from event fields (summary, start/end, location, …).

## Output

A valid iCalendar (.ics) document as text, containing the VEVENT component populated with the provided fields (summary, DTSTART, DTEND, location, description, UID, URL, PRODID, and calendar name) — ready to be attached to an email, saved to disk, or served as a downloadable file.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "summary",
      "start"
     ],
     "properties": {
      "end": {
       "type": "string",
       "description": "ISO end datetime."
      },
      "uid": {
       "type": "string",
       "maxLength": 256,
       "description": "Event UID. Auto-generated when omitted."
      },
      "url": {
       "type": "string",
       "maxLength": 2000,
       "description": "Event URL."
      },
      "start": {
       "type": "string",
       "description": "ISO start datetime (or date for all-day)."
      },
      "allDay": {
       "type": "boolean",
       "description": "Whether this is an all-day event. Defaults to false."
      },
      "prodId": {
       "type": "string",
       "maxLength": 256,
       "description": "Calendar PRODID. Defaults to a generic openverbs id."
      },
      "summary": {
       "type": "string",
       "maxLength": 1000,
       "minLength": 1,
       "description": "Event title."
      },
      "location": {
       "type": "string",
       "maxLength": 1000,
       "description": "Event location."
      },
      "description": {
       "type": "string",
       "maxLength": 10000,
       "description": "Event description."
      },
      "calendarName": {
       "type": "string",
       "maxLength": 256,
       "description": "Calendar display name."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ical-create-ics-generator-72b26473/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ical.openverbs.com](https://www.zero.xyz/host/ical.openverbs.com/llms.txt)