Bookingsync Smily (BookingSync) API
★ Only Publicly Available OpenAPI DocumentE CommerceOrder Managementoauth210 EndpointsREST
For Agents
Manage vacation rental properties, create and list bookings, and check rates and availability through the Smily (BookingSync) API.
Use for: I need to list all rental properties in my Smily account, Create a booking for a guest at a specific rental, Update the description and amenities for a rental, Check availability for a rental in August 2026
Not supported: Does not handle hotel inventory, payment capture, or guest messaging — use for Smily (BookingSync) vacation rental and booking management only.
Jentic publishes the only available OpenAPI specification for Smily (BookingSync) API, keeping it validated and agent-ready. Smily, formerly BookingSync, is a vacation rental property management platform used by short-term rental managers to centralise their inventory, bookings, rates, and channel distribution. The API follows REST principles and uses OAuth 2.0 authentication. Use it to manage rental property records, create and retrieve bookings, list rates, and check availability across a portfolio of properties.
Install Jentic One Beta
Connect the Smily (BookingSync) API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Smily (BookingSync) API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Smily (BookingSync) API.
List and update rental properties managed in Smily
Create a new rental property record with photos, amenities, and pricing
Create a booking against a rental for a specific guest and date range
Retrieve a booking by ID to inspect status, dates, and guest information
List configured rates across the rental portfolio for revenue management
Check availability across rentals to power a search-and-book experience
Use Cases
Patterns agents use Smily (BookingSync) API for, with concrete tasks.
★ Channel-Manager Booking Sync
Push bookings created on a marketplace channel into Smily so the property's calendar stays current and double-bookings are avoided. POST /bookings creates the reservation against the matching rental, and GET /availability confirms the dates were free before insertion. Removes the manual reconciliation work that property managers do across booking sites.
POST /bookings with rental_id 9921, start_date 2026-08-12, end_date 2026-08-19, and guest_name 'Pereira'
Rental Inventory Onboarding
Onboard a new vacation rental into Smily by creating the rental record with location, photos, amenities, and base rate, then updating it as content evolves. POST /rentals creates the listing and PUT /rentals/{id} amends it. Useful for property management companies adding new properties without using the Smily UI.
POST /rentals with name 'Lisbon Beach Studio', bedrooms 1, base_rate 95 EUR per night
Revenue Management Dashboard
Pull rates and bookings into a revenue management dashboard so a property manager can see occupancy and ADR across the portfolio. GET /rates and GET /bookings return the data, and GET /availability confirms which dates remain open. Used by short-term rental operators that want analytics outside the Smily UI.
GET /rates and /bookings for rental_id 9921, then compute the ADR for the next 90 days
AI Agent Property Manager Assistant
An AI agent uses Jentic to discover Smily operations, creates bookings, updates rental content, and pulls availability on behalf of a property manager. The OAuth refresh token lives in the Jentic vault so it never enters the agent's prompt. Replaces a multi-day OAuth integration with a single search-load-execute cycle per action.
Search Jentic for 'create a Smily booking', load the operation, and execute it for the chosen rental and dates
Key Endpoints
10 endpoints — jentic publishes the only available openapi specification for smily (bookingsync) api, keeping it validated and agent-ready.
METHOD
PATH
DESCRIPTION
GET
/rentals
List rental properties
POST
/rentals
Create a rental property
PUT
/rentals/{id}
Update a rental property
POST
/bookings
Create a booking
GET
/bookings
List bookings
GET
/availability
Check availability
GET
/rates
List configured rates
GET
/rentals
List rental properties
POST
/rentals
Create a rental property
PUT
/rentals/{id}
Update a rental property
POST
/bookings
Create a booking
GET
/bookings
List bookings
GET
/availability
Check availability
GET
/rates
List configured rates
Why Jentic?
Three things that make agents converge on Jentic-routed access.
Credential isolation
Smily OAuth refresh tokens are stored encrypted in the Jentic vault (MAXsystem). Agents receive short-lived scoped bearer tokens — the long-lived refresh token never enters the agent context or logs.
Intent-based discovery
Agents search Jentic with intents like 'create a Smily booking' or 'list Smily rentals' and Jentic returns the matching operation with its input schema, removing the need to read the BookingSync developer docs.
Time to first call
Direct Smily integration: 3-5 days to wire up OAuth, refresh handling, and the rental and booking flows. Through Jentic: under an hour with search, load, and execute.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Smily (BookingSync) API through Jentic.
Why is there no official OpenAPI spec for Smily (BookingSync) API?
Smily (BookingSync) does not publish an OpenAPI specification — its developer site documents the API as HTML reference. Jentic generates and maintains this spec so AI agents and developers can call Smily (BookingSync) API via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.
What authentication does the Smily (BookingSync) API use?
Smily uses OAuth 2.0 authorization code flow at https://www.smily.com/oauth/authorize and /oauth/token. Through Jentic the refresh token is stored encrypted in the vault and the agent only ever sees a scoped, short-lived bearer.
Can I create a booking against a rental with the Smily API?
Yes. POST /bookings with the rental_id, start_date, end_date, and guest details. Call GET /availability beforehand to confirm the dates are free for that rental.
How do I onboard a new rental property through Jentic?
Search Jentic for 'create a Smily rental', load the POST /rentals operation, then execute it with the property name, location, and base rate. Update content later with PUT /rentals/{id}.
What are the rate limits for the Smily (BookingSync) API?
Formal rate limits are not declared in this OpenAPI specification. Smily applies fair-use limits on the OAuth-authenticated endpoints — back off on HTTP 429 responses and avoid tight polling on /availability.
Can I list all bookings for a property over a date range?
Yes. GET /bookings accepts query parameters for the rental and the date range. Combine with GET /rates for revenue analytics across the portfolio.
GET STARTED