SignUpGenius has an official API only for paid Premium (Pro) subscribers, and it almost only reads: your sign-ups, report data and group members, plus adding a member to a group (checked 11 Oct 2026). Cotlet is a hosted MCP server and REST API for SignUpGenius with 15 endpoints (5 read, 10 write): your AI agent signs in as you and does the work.
SignUpGenius has an official API only for paid Premium (Pro) subscribers, and it almost only reads: your sign-ups, report data and group members, plus adding a member to a group (checked 11 Oct 2026). It cannot create or edit sign-ups, change slots, move participants or send messages.
What SignUpGenius's own tools do compared with Cotlet
Cotlet is best for organizers of schools, clubs and events who want their AI agent to build sign-ups, fill slots and message the group without running or fixing a server.
Make a sign-up for the spring bake sale on May 9: three two-hour shifts from 9:00, four volunteers each, plus two people for setup at 8:00. Assign it to the PTA group and leave it as a draft. Your agent calls list_groups, list_signups, get_signup, create_signup and add_slots.
Weekly report of open slots Runs: Weekly
Which slots on my active sign-ups are still empty in the next two weeks? Your agent calls list_signups and get_signup.
Every Monday, check my active PTA sign-ups for empty slots in the next 14 days and email the group members who have not signed up, listing the open shifts. Your agent calls list_signups, get_signup and send_message.
Move a participant to another slot
Jordan can't make Saturday. Move them to the Sunday 10:00 shift and let them know. Your agent calls list_participants, get_signup and move_participant.
Copy last year's sign-up and publish it
Copy last year's teacher conference sign-up, rename it for 2027 and publish it. Your agent calls list_signups, duplicate_signup and publish_signup.
Endpoints
What is the SignUpGenius API?
Cotlet's SignUpGenius API exposes 15 endpoints for your own SignUpGenius account: list sign-ups, get sign-up, list participants, list groups, list group members, create sign-up, add slots, update slot, duplicate sign-up, publish sign-up, add participant, move participant, remove participant, send message and add group member. The list_signups endpoint returns sign-ups you created, with title, group, dates and how many slots are filled. Each endpoint takes simple JSON inputs like signup_id, group_id or title and works both as an MCP tool for agents and as a REST call for scripts.
Sign-ups you created, with title, group, dates and how many slots are filled.
read
Returns your sign-ups, newest first, with the group each one is assigned to and the count of filled and wanted spots. Use signup_id from each item in the other endpoints. Drafts are included only when status is drafts.
One sign-up with its description, link and every slot: title, date, time, location, wanted and filled.
read
Returns the sign-up and its slots in date order. Each slot has the ID other endpoints need and the number of people wanted and filled. Set open_only to get only slots that still have spots.
Who signed up for which slot, with name, email, quantity and answers to custom questions.
read
Returns one row per participant, in slot order. Email is empty when the person did not give one. Answers to custom questions come as question and answer pairs. Use from and to to limit the slot dates.
Your groups (the people you invite) with member counts.
read
Returns every group in your account with its ID and member count. Use group_id from each item in create_signup, list_group_members and add_group_member.
New sign-up saved as a draft. Nothing is visible or sent until you publish it.
write
Creates an empty sign-up as a draft and returns its ID. Nobody can see it and no email goes out until publish_signup. It reaches no one and you can delete the draft, so it runs without asking first. Add slots next with add_slots.
Add slots (roles or tasks) to a sign-up, on one or more dates and times.
write
Adds one slot per date-time you pass, all with the same title and quantity, and returns each new slot ID. The sign-up keeps its status, so slots added to a draft stay hidden. It reaches no one, so it runs without asking first.
POST /api/v1/signupgenius/add_slots
Input
Input: add_slots
Parameter
Type
Description
signup_id required
string
Sign-up ID from list_signups.
title required
string
Slot name, e.g. "Main dish" or "Setup crew".
quantity required
integer
Number of people wanted per date.
dates
string[]
ISO date-times the slot applies to, with time zone. Empty: slot without a date.
Change a slot's title, quantity, location or help comment. Quantity cannot go below the people already signed up.
write
Changes the fields you pass and returns the slot as it is now. A quantity lower than the people already signed up is refused. On a published sign-up the change is visible at once, but no one is told, so it runs without asking first.
Copy a sign-up with a new title. The copy is an unpublished draft.
write
Copies a sign-up, past or active, with its slots, and saves the copy as an unpublished draft under the new title. Nobody sees it and no one is told, so it runs without asking first. Check the dates on the copy before you publish it.
Make a draft sign-up live and return its public link. Does not send invites.
asks first write
Makes a draft visible to anyone with the link and returns that link. It does not email the group; use send_message for that. By default you confirm each call; you can switch that off for this tool.
Sign someone up for a slot as the organizer, from a group or as a new person.
asks first write
Signs a person up for a slot and returns the new participant ID. With send_confirmation on, they get a confirmation email. A full slot is refused. By default you confirm each call; you can switch that off for this tool.
Move a participant from their slot to another open slot on the same sign-up.
asks first write
Moves one participant to a slot that still has room, on the same sign-up, and returns both slot IDs. With notify on, the participant gets an email about the change. By default you confirm each call; you can switch that off for this tool.
POST /api/v1/signupgenius/move_participant
Input
Input: move_participant
Parameter
Type
Description
signup_id required
string
Sign-up ID from list_signups.
participant_id required
string
Participant ID from list_participants.
to_slot_id required
string
Target slot ID from get_signup.
notify
boolean
Email the participant about the change. Default: true.
Removes one participant from their slot, which frees the spot. With notify on, the participant gets an email. By default you confirm each call; you can switch that off for this tool.
POST /api/v1/signupgenius/remove_participant
Input
Input: remove_participant
Parameter
Type
Description
signup_id required
string
Sign-up ID from list_signups.
participant_id required
string
Participant ID from list_participants.
notify
boolean
Email the participant about the change. Default: true.
Email the people on a sign-up: everyone, those who signed up, or those who have not.
asks first write
Sends one email from your SignUpGenius account and returns how many people it went to. People without an email are skipped and counted. Assign the sign-up to a group so not_signed_up has a list to compare with. By default you confirm each call; you can switch that off for this tool.
Add a person to one of your groups so you can invite them later. Sends nothing.
write
Adds one person to a group and returns the member ID. Nothing is sent to them, and you can remove them from the group in SignUpGenius, so it runs without asking first. One person per call.
How do I connect SignUpGenius to Claude Code, Codex or Cursor?
Connecting SignUpGenius takes three steps: request access, sign in to SignUpGenius once, then add one MCP server or call the REST API with the same key.
Connect SignUpGenius over MCP
1
Create an account
Sign up and add SignUpGenius in the console. Your API key is there too.
2
Sign in to SignUpGenius once
Open the connect page from the console and sign in to SignUpGenius the way you always do. We keep the session, never your password, and you can revoke it anytime.
Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.
4
Ask your agent
Prompt
Make a sign-up for the spring bake sale on May 9: three two-hour shifts from 9:00, four volunteers each, plus two people for setup at 8:00. Assign it to the PTA group and leave it as a draft.
Ask in plain words. Your agent finds the SignUpGenius tools on the server and calls them for you; anything that reaches other people waits for your OK unless you switch that off for a tool.
Call SignUpGenius over REST
1
Export your API key
Shell
export COTLET_API_KEY="cotlet_..."
Your scripts use the same API key as your agent. Keep it in an environment variable, never in your code.
2
Call a tool
curl
curl https://cotlet.dev/api/v1/signupgenius/add_slots \
-H "Authorization: Bearer $COTLET_API_KEY" \
-H "Content-Type: application/json" \
-d '{"signup_id":"50463821","title":"Bake sale shift","quantity":4,"dates":["2027-05-09T09:00:00-04:00","2027-05-09T11:00:00-04:00","2027-05-09T13:00:00-04:00"],"location":"School lobby","help_comment":"Bring a float of small bills."}'
Every tool is a POST endpoint at /api/v1/signupgenius/{tool}. Send its parameters as JSON, exactly as listed in the endpoints above.
You get plain JSON back, ready for your script. A failed call costs nothing.
Why Cotlet
Why use Cotlet for SignUpGenius? Hosted, safe and kept working.
Built for agents
One MCP server for every app you connect.
The same tools as a REST API for scripts and cron jobs.
Works with Claude Code, Codex and Cursor.
Your login stays yours
You sign in to SignUpGenius yourself. We keep only the session, encrypted with AES-256.
The model never sees a login.
No stored passwords, no CAPTCHA solving, no MFA bypass.
You stay in control
Pick read only, or read and write.
Anything that reaches other people waits for your OK, unless you switch it off per tool.
Revoke access in one click.
Kept working for you
We test every integration daily.
When SignUpGenius changes, the tool pauses until we fix it.
Failed calls cost nothing.
Alternatives
Is there a SignUpGenius MCP server on GitHub?
Yes. A community MCP server exists on GitHub, maintained by one person. You install it on your own computer, give it your login, and fix it yourself when SignUpGenius changes. It reads sign-ups and can claim a slot or RSVP as you, but it does not build sign-ups or message people. Cotlet hosts a server for the organizer side, and our team keeps it working.
Cotlet compared with a GitHub MCP server
GitHub MCP server
Cotlet
Setup
Clone the repo, put your email and password in a .env file, add it to each MCP client
Request access, sign in to SignUpGenius once in your browser, add one MCP server or API key
When SignUpGenius changes
It breaks until you or the maintainer fix it
Our team tests it daily and fixes it for you; failed calls are free
Your session
Your password in a file on your computer, readable by any program you run
Only the session, encrypted in an EU vault; we never keep your password
When the session expires
Tools fail until you sign in again by hand
We keep it alive; if SignUpGenius logs you out, your agent gets a link to sign in again
Organizer actions
Read sign-ups, claim or release a slot, RSVP, add a group member
Create sign-ups and slots, move or remove participants, message the group, each send confirmed by you
Where it runs
Your computer, while it is on
Hosted: Claude Code, Codex, Cursor, n8n and scripts, also on a schedule
Price
Free, paid for with your time
Free 7-day trial with 5,000 credits, then credits per call
Which one fits you
Pick Cotlet if
you are not a developer, or you do not want to maintain a server
you need it to keep working when SignUpGenius changes, without checking it yourself
your agent or a script should run it on a schedule, also while your computer is off
Pick an open-source server if
you are comfortable installing, updating and fixing it yourself
you want the session to stay on your own computer
you only need it now and then, from one MCP client
For AI agents
Cotlet for SignUpGenius in plain text The facts on this page in one block: status, endpoints, access, pricing, contact.
Endpoint health
verified 2h ago
list_signupspassing
get_signuppassing
list_participantspassing
list_groupspassing
list_group_memberspassing
+ 10 more endpoints
15/15 passing latest checkself-healing
signupgenius.txt
SignUpGenius has an official API only for paid Premium (Pro) subscribers, and it almost only reads: your sign-ups, report data and group members, plus adding a member to a group (checked 11 Oct 2026). It cannot create or edit sign-ups, change slots, move participants or send messages.
Cotlet provides a hosted MCP server and REST API for SignUpGenius: 15 tools (5 read, 10 write).
Access Request access at https://cotlet.dev/app/signup?app=signupgenius; we email the API key.
MCP server https://cotlet.dev/mcp/v1
REST base https://cotlet.dev/api/v1/signupgenius
Auth Authorization: Bearer <COTLET_API_KEY>. Listing endpoints and schemas needs no key; calling an endpoint needs one.
Tools list_signups, get_signup, list_participants, list_groups, list_group_members, create_signup, add_slots, update_slot, duplicate_signup, publish_signup, add_participant, move_participant, remove_participant, send_message, add_group_member
Confirm publish_signup, add_participant, move_participant, remove_participant, send_message (by default the user approves each call; the user can switch this off per tool, e.g. for scheduled automations)
Markdown https://cotlet.dev/integrations/signupgenius-api-mcp-server.md
How access works:
1. The user requests access at https://cotlet.dev/app/signup?app=signupgenius (SignUpGenius is pre-selected). Each request is reviewed and the API key is sent by email.
2. The user signs in to SignUpGenius once in a browser. An agent cannot do this step.
3. The API key goes into the MCP client or the REST call as a bearer token.
Fits: people who want a hosted SignUpGenius server that someone else maintains, including non-developers. Developers who prefer to run and fix code on their own computer can use an open-source SignUpGenius MCP server instead.
Policy: Cotlet never stores passwords, never solves CAPTCHAs, never bypasses MFA.
Company: legal details in the Terms of service at https://cotlet.dev/terms. Contact contact@cotlet.dev.
Session: the user signs in to SignUpGenius in a browser; Cotlet keeps only the session, AES-256 encrypted, revocable in the dashboard at any time.
Terms: the user stays responsible for following SignUpGenius's terms; Cotlet is not affiliated with SignUpGenius.
Can SignUpGenius automations run on a schedule in n8n, Make or Zapier?
Yes. Cotlet does not replace your automation platform: it gives it a SignUpGenius connection it does not have, with the same API key as your agent. Write actions ask for your OK by default; switch that off in your dashboard for the tools you choose, for example to weekly report of open slots, and the schedule runs on its own. Cotlet runs in the cloud, so it keeps going while your computer is off.
Where to run SignUpGenius automations through Cotlet, and how to schedule them
Where
How to connect
How to schedule
Your AI agent
Add https://cotlet.dev/mcp/v1 with your API key.
A scheduled agent run, for example a Claude Code routine.
n8n
MCP Client node with https://cotlet.dev/mcp/v1, or an HTTP Request node to https://cotlet.dev/api/v1/signupgenius/{tool}.
Schedule Trigger node.
Make
HTTP module: POST https://cotlet.dev/api/v1/signupgenius/{tool} with an Authorization: Bearer header and a JSON body.
Scenario schedule.
Zapier
Webhooks by Zapier: POST https://cotlet.dev/api/v1/signupgenius/{tool} with the same header and body.
Schedule by Zapier trigger.
Your own script
POST https://cotlet.dev/api/v1/signupgenius/{tool} with your API key.
cron or GitHub Actions.
Pricing & limits
How much does the SignUpGenius API cost?
Free 7-day trial with 5,000 credits, no card needed. After that, the SignUpGenius API comes with the Cotlet plan, from $29 a month for 3,000 credits, with no limit on apps. Each month's credits stay valid for 3 months, so unused credits add up.
Cotlet plan sizes: price, monthly credits and price per credit
Size
Price
Credits / month
Per credit
Solo
$29/mo
3,000
about $0.0097
Pro
$99/mo
12,000
about $0.0083
Agency
$299/mo
40,000
$0.0075
Each successful call uses credits for the work it takes; failed calls and timeouts cost nothing. A hard spend cap is on by default. Authenticate with the Authorization: Bearer header.
About Cotlet
How Cotlet holds your access
Cotlet hosts MCP servers and REST APIs for apps with no usable API. Your agent works in your own SignUpGenius account.
Company details
The legal name, address and registration numbers of the company behind Cotlet are in the Terms of service. Terms
Your session
You sign in to SignUpGenius yourself, in your browser. We keep only the session, never your password: encrypted with AES-256 in an EU vault, isolated to your account and used only when your agent calls a SignUpGenius tool you allowed. When it expires, your agent gives you a link to sign in again. Security
Revoking access
Disconnect SignUpGenius in your dashboard: the session is deleted and access ends at once. Actions that reach other people wait for your OK unless you switch that off per tool.
What we never do
Store passwords, solve CAPTCHAs or bypass MFA.
SignUpGenius's terms
You use your own SignUpGenius account and stay responsible for following SignUpGenius's terms. Cotlet is independent and not affiliated with SignUpGenius. Terms
Request access and pick SignUpGenius. Cotlet reviews each request and emails you your API key.
Do I need to be technical?
No. You sign in to SignUpGenius once in your browser and paste one command into your agent, or one URL into n8n. Your agent can walk you through it. There is no server to install, update or fix.
Is a hosted server safe? My SignUpGenius session would leave my computer.
Cotlet keeps your SignUpGenius session encrypted with AES-256 in an EU vault, isolated to your account and used only for the tools you allow: read only, or read and write. The AI model never sees it, and you revoke it in one click. A local server keeps the same session in a file on your computer, readable by any program you run, and needs a fresh sign-in whenever it expires.
Do I need a Premium plan?
No. Cotlet works in your own organizer account and does not use the Premium API key, which SignUpGenius limits to paid plans (Silver gets a handful of calls a day, Gold and Platinum up to 5,000). Features your plan lacks stay unavailable, as in the web app.
Can my agent post or send messages in SignUpGenius without asking me?
No. Every call to publish_signup, add_participant, move_participant, remove_participant or send_message waits for your OK by default. For scheduled automations you can switch confirmation off per tool in your dashboard, for example only for approvals. create_signup, add_slots, update_slot, duplicate_signup, add_group_member runs without asking, because it sends nothing to anyone and one call undoes it.
Can I use the SignUpGenius API in n8n?
Yes. Add https://cotlet.dev/mcp/v1 with your API key in n8n's MCP Client node, or call https://cotlet.dev/api/v1/signupgenius/{tool} from the HTTP Request node.
