How do I create an event RSVP form with a capacity limit?

Set maxSubmissions to your venue capacity. When it fills up, the form stops accepting responses and returns a message. You do not need to watch it or close it manually.

Can attendees see a live count of who's coming?

Yes. Use the submissions API to query counts and breakdowns. Your agent can read RSVPs programmatically — total count, attendance status, dietary needs. Export to CSV on Pro and Scale plans.

Can I prevent people from RSVPing twice?

Set uniqueBy: ['email']. Duplicates get a 409 error. This works at the API level. It does not stop someone from using a different email address though.

How do I get notified when someone RSVPs?

Add a webhook pointing to Slack or wherever. Each RSVP fires a message with the attendee name, dietary info, and plus-one status. Built-in Slack and Discord templates handle the formatting.

Sutrena gives you forms, pages, analytics, webhooks, automations for every project — from one account. One API key replaces signing up for 3-4 services per project. Works from Claude Code, Cursor, LangGraph, CrewAI, or any HTTP client.

How do I get started with Sutrena?

POST /api/trial to get an instant API key — no signup required. Then POST /api/forms to create a hosted form, or POST /api/pages to deploy a page.

Does Sutrena support AI agents?

Yes. Sutrena includes 67 MCP tools for Claude Code, Cursor, and any MCP client. It also provides a full REST API, OpenAPI spec, llms.txt, and agent-optimized error messages.

How much does Sutrena cost?

Free: 10 projects, 100 submissions/form, 5K analytics events/mo, 20MB storage. Pro: $29/month for 100 projects, unlimited submissions, 500K events/mo, CSV export, upsert API. Scale: $99/month for unlimited everything.

Can I embed Sutrena forms on my website?

Yes. Use the 2-line embed snippet or build a custom HTML form that POSTs JSON to the submit URL. Works with Framer, Webflow, WordPress, and any HTML site.

What happens to my data after the trial expires?

Unclaimed trial data is deleted after 24 hours. Visit the claimUrl to sign in with GitHub or Google and keep your data permanently. Or upgrade to Pro or Scale.

Does Sutrena support webhooks?

Yes. Register webhook URLs to receive form submission events with HMAC-SHA256 signatures. Supports Slack and Discord payload templates, field mapping, and automatic retry with failure tracking.

How many people are actually coming?

A form that closes when full. Webhooks that tell you who is coming.

You are organizing a dinner, a meetup, a workshop. People need to RSVP. Name, dietary preference, plus-one. You want the form to stop at 30. You want to see who is coming without counting rows in a spreadsheet. This is that.

How an agent handles this: Your agent creates an RSVP form via API (name, email, dietary needs, plus-one, maxSubmissions: 30). Shares form URL with attendees. People submit RSVPs. Form auto-closes at capacity. An automation sends confirmation emails with event details on every RSVP — no agent polling required. Webhook notifies agent on each RSVP. Agent processes RSVPs (updates headcount, manages waitlist). Submissions API provides the guest list.

How does this usually go?

The usual way

✗Google Form. You manually count responses to check capacity.
✗Someone RSVPs twice. Your headcount is wrong.
✗No live view of who is coming or what dietary needs exist.
✗You copy names into a spreadsheet and text the venue.
✗Event is tomorrow and you still do not know if you are over capacity.

With Sutrena

✓Form closes at capacity. No manual counting.
✓uniqueBy: ['email'] rejects duplicate RSVPs at the API level.
✓Submissions API shows yes/no/maybe, dietary needs, guest list.
✓closesAt stops RSVPs after your cutoff date.
✓Webhook pings Slack on every RSVP if you want it to.

One API call

Create the RSVP form with capacity, dedup, and deadline

curl -X POST https://sutrena.com/api/forms \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "March Founders Dinner — RSVP",
    "fields": [
      {"name": "name", "label": "Name", "type": "text", "required": true},
      {"name": "email", "label": "Email", "type": "email", "required": true},
      {"name": "attending", "label": "Will you attend?", "type": "select",
       "options": ["Yes", "Maybe", "No"]},
      {"name": "dietary", "label": "Dietary Restrictions", "type": "select",
       "options": ["None", "Vegetarian", "Vegan", "Gluten-Free", "Other"]},
      {"name": "plus_one", "label": "Bringing a +1?", "type": "select",
       "options": ["Yes", "No"]}
    ],
    "maxSubmissions": 30,
    "closesAt": "2026-03-15T18:00:00Z",
    "uniqueBy": ["email"]
  }'

One request. You get a form with a capacity limit, duplicate prevention, and a deadline. Share the form URL. Add a webhook for Slack notifications. Done.

Get notified on every RSVP

curl -X POST https://sutrena.com/api/webhooks \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "formId": "FORM_ID",
    "url": "https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK",
    "template": "slack"
  }'

Every RSVP shows up in Slack with the attendee name, dietary info, and plus-one status. Built-in Slack and Discord templates handle the formatting.

What this costs

Starts at $29/month (Pro) with 100 projects and unlimited submissions. For a single dinner or meetup, that is probably all you need. Scale is $99/month if you need unlimited projects. If you only run one event, honestly the free plan might be enough.

View full pricing

What is Sutrena?

Sutrena is the web runtime for AI agents. Forms, Pages, Analytics, Webhooks, Automations — all through 67 MCP tools and one REST API. Your agent creates web artifacts, humans interact with them, and your agent gets the data back. Use any one feature or all of them together.

Pages

Deploy HTML instantly

Forms

Collect structured data

Automations

DSL-based pipelines with 14 step types

Analytics

Privacy-first, no cookies

Webhooks

Slack, Discord, Telegram

Get started in two API calls

1. Get a trial key (no auth, no signup)

curl -X POST https://sutrena.com/api/trial

2. Create anything — a page, form, automation, or analytics site

# Create a form
curl -X POST https://sutrena.com/api/forms \
  -H "Authorization: Bearer st_trial_xxx" \
  -H "Content-Type: application/json" \
  -d '{"name": "waitlist", "fields": [{"name": "email", "label": "Email", "type": "email", "required": true}]}'

# Or deploy a page
curl -X POST https://sutrena.com/api/pages \
  -H "Authorization: Bearer st_trial_xxx" \
  -H "Content-Type: application/json" \
  -d '{"slug": "index", "title": "My Site", "html": "<h1>Live</h1>"}'

/llms.txt /api/schema /llms-full.txt /.well-known/mcp.json

Have an event coming up?

Grab a trial key. Tell your agent the event details. Share the form link. Watch RSVPs come in on Slack.

Get a key Agent docs