Get started

OneTapCheckIn for AI agents

OneTapCheckIn helps organizations run events by managing attendee profiles, check-ins, and attendance alerts. Event and operations teams use it to track who showed up and when. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect OneTapCheckInSee the 19 actions ↓
SchedulingAPI keyMCP + RESTonetapcheckin.com
AUDIT LOG · ONETAPCHECKINPOLICY: acme-support
09:41:07 · claude · u_8f2read
onetapcheckin.list_alerts
List Alerts✓ allowed · 212ms
09:41:08 · claude · u_8f2read
onetapcheckin.find_lists
Find Lists✓ allowed · 164ms
09:41:09 · claude · u_8f2write
onetapcheckin.create_list
Create List✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
onetapcheckin.delete_list
Delete List✕ blocked · policy: deny
EVERY ONETAPCHECKIN CALL, ON THE RECORD
01 · USE CASES

What agents do in OneTapCheckIn.

01

Check in a participant

Update a participant's attendance record the moment they arrive at an event.

02

Look up a participant list read-only

Find participants registered for an event before printing badges or sending reminders.

03

Remove a participant with approval

Take a participant off a list only after an organizer confirms the removal is correct.

02 · ACTIONS

19 OneTapCheckIn actions, graded by risk.

Every OneTapCheckIn action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

7

Look things up. Allowed by default.

  • onetapcheckin.find_lists
    Find Lists
  • onetapcheckin.list_alerts
    List Alerts
  • onetapcheckin.find_profiles
    Find Profiles
  • onetapcheckin.list_passports
    List Passports
  • onetapcheckin.get_organization
    Get Organization
  • onetapcheckin.find_participants
    Find Participants
  • onetapcheckin.get_profile_custom_fields
    Get Profile Custom Fields

write

9

Create and change things. Allow, or ask the user first.

  • onetapcheckin.create_list
    Create List
  • onetapcheckin.update_list
    Update List
  • onetapcheckin.create_profile
    Create Profile
  • onetapcheckin.update_profile
    Update Profile
  • onetapcheckin.create_profiles
    Create Profiles
  • onetapcheckin.add_participants
    Add Participants
  • onetapcheckin.update_participant
    Update Participant
  • onetapcheckin.update_participant_attendance
    Update Participant Attendance
  • onetapcheckin.update_participant_attendance_batch
    Update Participant Attendance Batch

destructive

3

Delete, cancel or archive. Ask first, or deny outright.

  • onetapcheckin.delete_list
    Delete List
  • onetapcheckin.delete_profile
    Delete Profile
  • onetapcheckin.remove_participant
    Remove Participant
03 · HOW IT WORKS

OneTapCheckIn in three steps.

  1. 01Your users connect OneTapCheckInThey add their OneTapCheckIn api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “create List” can wait for the user, and “delete List” can be denied outright.
  3. 03Any agent can actYour agent calls OneTapCheckIn through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('onetapcheckin', {
  read: 'allow',
  write: 'ask',        // create_list
  destructive: 'deny',  // delete_list
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How OneTapCheckIn connects.

Users add their OneTapCheckIn api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same OneTapCheckIn connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use OneTapCheckIn from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More scheduling apps.

Google Calendar50 actionsCalendly57 actionsApaleo29 actionsCal175 actionsBookingmood142 actionsEventbrite95 actionsEtermin78 actionsTicket Tailor77 actions
ALL SCHEDULING APPS →
07 · FAQ

OneTapCheckIn and Arc0, answered.

Q01

Can I use OneTapCheckIn with Claude, ChatGPT or Cursor?

Yes. Connect OneTapCheckIn to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the OneTapCheckIn actions you allow.

Q02

How do users connect OneTapCheckIn?

Users add their OneTapCheckIn api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which OneTapCheckIn actions can my agent take?

19 in total: 7 read, 9 write and 3 destructive, such as “create List”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in OneTapCheckIn?

Yes. Actions like “delete List” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call OneTapCheckIn too?

Yes. The same OneTapCheckIn connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug OneTapCheckIn into your agent.

Your users connect OneTapCheckIn once, under your brand. Your agent gets 19 actions behind your policies, with every call on the record.

Connect OneTapCheckInBrowse all apps →

Free to build · MCP + REST · Audit log on every plan