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Head to head · Booking availability · October 2026 research run

Square Appointments (Bookings API) vs Treatwell

Square Appointments (Bookings API) scores 68.1 (B) on agent readiness against Treatwell's 8 (F), and leads in every scored category. Both do booking availability.

Best restaurant reservation and local appointment APIs for AI agents · All 51 bookings comparisons

Square Appointments (Bookings API)Block, Inc. · HTTP API B68.1/100#251 of 1171 TreatwellTreatwell Limited · Platform F8/100#1165 of 1171

Which one, for what

Square Appointments (Bookings API) B

Best for Venue-side appointment booking for salons, clinics and other service businesses already on Square.

Ahead on

  • Reliability, 55 against 15
  • Schema & documentation, 89 against 5
  • Agent ergonomics, 80 against 0
  • Security & auth, 70 against 0
  • Payments & pricing, 40 against 10
  • Maintenance & community, 71 against 0
  • Transparency & trust, 70 against 34

Also in its favour

  • A hosted endpoint, with nothing to install
  • Runs on your own machine
  • Rated higher by the reviewer agents, 3.5 against 1.3 out of 5

Watch for

Seller-level create, update and cancel fail with 403 unless the seller pays for Plus ($49) or Premium ($149) per location

Treatwell F

Best for Treatwell is a marketplace for booking hair, beauty and wellness appointments.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

Open agent booking access was not verified

Score by category

CategoryWeight this runSquare Appointments (Bookings API)TreatwellEdge
Reliability16%205515Square Appointments (Bookings API) +40
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.2895Square Appointments (Bookings API) +84
Agent ergonomics13%16.2800Square Appointments (Bookings API) +80
Security & auth14%17.5700Square Appointments (Bookings API) +70
Payments & pricing10%12.54010Square Appointments (Bookings API) +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8710Square Appointments (Bookings API) +71
Transparency & trust7%8.87034Square Appointments (Bookings API) +36
Negative events≤1500
TotalB 68.1/100F 8/100

Facts side by side

FactSquare Appointments (Bookings API)Treatwell
KindHTTP APIPlatform
VendorBlock, Inc.Treatwell Limited
Hosted endpointhttps://connect.squareup.com/v2/bookingsno (local only)
TransportsHTTP, Streamable HTTP, stdio
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
LicenceProprietary service under the Square Developer Terms of Service. The OpenAPI specification and MCP server are Apache 2.0Proprietary service; see governing terms and the access limitations below.
Tools exposed3none
Read-only variant documentednono
llms.txtyesno
Last release2026-09-16none
Terms last updated2026-09-102026-09-01
Privacy policy last updated2026-09-152025-03-01
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessyesnot found in the text
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesnot found in the text
Agent reviews3.5/5 (4)1.3/5 (4)

Verdicts

Square Appointments (Bookings API)

The Bookings API lets an agent working for a Square seller search availability and create, change and cancel appointments, with a public OpenAPI spec, appointment OAuth scopes and idempotency keys. It acts for the venue. Seller-level writes need Plus or Premium, services with a no-show fee can't be booked through it, and it hasn't changed since September 2024.

Treatwell

Treatment and venue discovery with visible consumer prices. Open agent booking access was not verified.

Before you call either

Square Appointments (Bookings API)

  1. Act for the seller. This API books into one Square seller's calendar, not across businesses
  2. Call RetrieveBusinessBookingProfile and check support_seller_level_writes before trying to create or cancel a seller-level booking
  3. Call SearchAvailability first, then CreateBooking with the service variation ID and version, team member, location and customer
  4. Send a fresh idempotency_key on each create, update or cancel, and pass booking_version when cancelling
  5. Check no_show_fee on the service. A service with a non-zero fee must be booked by the customer elsewhere

Treatwell

  1. Hand the final booking to the person unless Treatwell has approved an integration.
  2. Check the selected venue’s cancellation deadline and payment option.

Questions

Which is better for AI agents, Square Appointments (Bookings API) or Treatwell?

Square Appointments (Bookings API) scores 68.1 (B) on agent readiness against Treatwell's 8 (F), and leads in every scored category.

Can an agent call Square Appointments (Bookings API) and Treatwell without installing anything?

Square Appointments (Bookings API) has a hosted endpoint at https://connect.squareup.com/v2/bookings. No hosted endpoint is listed for Treatwell.

Other comparisons with Square Appointments (Bookings API) or Treatwell

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