# Realtime Market API – Cal.com booking page

> Access real-time gold, forex, crypto, and stock market data with ultra-low latency and simple REST endpoints. Designed for trading platforms, fintech apps, and analytics systems. 50+ instruments. Latency under <150ms. Uptime 99.99%.

Booking page: https://cal.com/realmarketapi

## Event types

- [Cuộc họp 15 phút](https://cal.com/realmarketapi/15min): 15 min, confirmed instantly, event type id 5361486. Details: https://cal.com/realmarketapi/15min.md
- [Cuộc họp 30 phút](https://cal.com/realmarketapi/30min): 30 min, confirmed instantly, event type id 5361485. Details: https://cal.com/realmarketapi/30min.md

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=<event type id>&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

Each event type's `.md` document lists its required booking fields and the `POST https://api.cal.com/v2/bookings` request (`cal-api-version: 2026-02-25`).

## More

- API docs: https://cal.com/docs/api-reference/v2/introduction