# ICS Calendar File Generator

> ICS Calendar File Generator is a paid API for AI agents from ics.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Generates a valid RFC 5545 iCalendar (.ics) file from event data including title, start/end times, location, description, organizer, and attendees

## Facts

- Endpoint: POST https://ics.hergertsynthora.com/service
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ics-calendar-file-generator-c344cf0e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-Wnm5dL2pOSJV1tN3aEEf

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 ics-calendar-file-generator-c344cf0e -d '<json body>'
```

Example prompt: Create a calendar invite for 'Q3 Planning Meeting' on Friday June 20 at 2pm to 3:30pm UTC at the main conference room, with the description 'Quarterly planning session for all leads', and generate the .ics file so I can attach it to the invite email.

## When to prefer this

Use this endpoint when you need to programmatically generate standards-compliant .ics calendar files that can be attached to emails or imported into calendar applications like Google Calendar, Outlook, or Apple Calendar — especially when correctness of RFC 5545 escaping, line-folding, and UID generation is important and you want a zero-dependency serverless solution

## Known failure modes

- Invalid ISO 8601 date format returns a parsing error
- Missing required title or start time returns a validation error
- Malformed attendee email addresses may cause generation failure
- End time before start time may produce invalid output or error
- Missing X-WALLET header after free trial exhaustion returns a payment required error

## How this service works

Generate a valid iCalendar (.ics, RFC 5545) file from event data (title, start/end ISO 8601, location, description, attendees). Correct escaping, line-folding, UID. Zero deps, no hallucination. Ed25519-signed. First 3 calls FREE (X-WALLET).

## Output

Returns a valid RFC 5545 iCalendar (.ics) file with correct VEVENT structure, properly escaped fields, line-folding, a generated UID, and times normalized to UTC — ready to attach to an email or calendar system

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "end": {
   "type": "string"
  },
  "start": {
   "type": "string",
   "description": "ISO 8601 start"
  },
  "title": {
   "type": "string"
  },
  "location": {
   "type": "string"
  },
  "description": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "ics",
  "result": {
   "ics": "BEGIN:VCALENDAR...END:VCALENDAR",
   "uid": "...@synthora",
   "filename": "Sync.ics",
   "dtstart_utc": "20260801T150000Z",
   "content_type": "text/calendar; charset=utf-8"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ics-calendar-file-generator-c344cf0e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ics.hergertsynthora.com](https://www.zero.xyz/host/ics.hergertsynthora.com/llms.txt)