# Calendar Availability API

> Calendar Availability API is a paid API for AI agents from beautiful-nature-production-a883.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Returns busy and free time slots for a calendar, given a time range query

## Facts

- Endpoint: POST https://beautiful-nature-production-a883.up.railway.app/availability?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/calendar-availability-api-d21395e6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AgB8nDELkTVb3ej52af0-

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 calendar-availability-api-d21395e6 -d '<json body>'
```

Example prompt: Can you check my calendar for October 15th and show me which time slots are free and which are already booked?

## When to prefer this

Use this endpoint when an AI agent needs to determine calendar availability — specifically when you need structured busy/free slot data returned in a machine-readable format. It is well-suited for scheduling automation flows where the agent must check conflicts before proposing or booking meeting times.

## Known failure modes

- Missing or malformed request body returns an error
- Invalid date/time format may cause parsing failures
- No time range specified may return empty or default results
- Service unavailability on Railway hosting infrastructure
- Payment failure via x402 protocol blocks the request

## How this service works

Calendar & scheduling for AI agents

## Output

A JSON object with two arrays: 'busy' (list of occupied time blocks with start, end, and event title) and 'free' (list of available time blocks with start and end timestamps), both in ISO 8601 UTC format.

## 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": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "busy": [
   {
    "end": "2026-10-15T11:00:00Z",
    "start": "2026-10-15T10:00:00Z",
    "title": "Standup"
   }
  ],
  "free": [
   {
    "end": "2026-10-15T10:00:00Z",
    "start": "2026-10-15T09:00:00Z"
   },
   {
    "end": "2026-10-15T12:00:00Z",
    "start": "2026-10-15T11:00:00Z"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/calendar-availability-api-d21395e6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from beautiful-nature-production-a883.up.railway.app](https://www.zero.xyz/host/beautiful-nature-production-a883.up.railway.app/llms.txt)