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123FormBuilder API and MCP server

123FormBuilder's API cannot add or change form fields, edit what a respondent submitted or change notification emails. Sign in to 123FormBuilder once in your own Cloud Browser, and your AI agent does the work there for you. The same tools work over MCP for agents and as a REST API for scripts.

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Not affiliated with 123FormBuilder.

123FormBuilder's own API leaves this out. So we run one for you.

123FormBuilder's own API, a GitHub MCP server and Cotlet compared
What you need 123FormBuilder's APIGitHub MCP serverCotlet
Form fields, submission edits, notification emails No No Yes, 14 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when 123FormBuilder changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 23, 2026. Sources: 123FormBuilder Developer Center: API v2 · 123FormBuilder Developer Center: API v2 Forms (Swagger reference) · Help: How many API calls can I use? · Zapier: 123FormBuilder integrations

Your own Cloud Browser, on 24/7. Sign in once. We keep it connected.

  1. 01Sign in to 123FormBuilder in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect 123FormBuilder to Claude, ChatGPT or my code?

AI agents connect over MCP, scripts call the REST API. Both reach the same 14 tools with one API key.

For AI agents: MCP

Add Cotlet to your agent once. 123FormBuilder and every other app you connect show up as its tools.

  • Claude
  • ChatGPT
  • OpenClaw
  • Hermes
  • GrokBot
  • Cursor
  • n8n
  • Any MCP client
  1. 1

    Add Cotlet to your agent

    Claude Code
    claude mcp add --transport http cotlet \
  https://cotlet.dev/mcp/v1 \
  --header "Authorization: Bearer $COTLET_API_KEY"
    Cursor
    {
  "mcpServers": {
    "cotlet": {
      "url": "https://cotlet.dev/mcp/v1",
      "headers": {
        "Authorization": "Bearer ${COTLET_API_KEY}"
      }
    }
  }
}
    Codex
    # ~/.codex/config.toml
[mcp_servers.cotlet]
url = "https://cotlet.dev/mcp/v1"
bearer_token_env_var = "COTLET_API_KEY"

    Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.

For scripts: REST API

Every tool is an endpoint under /api/v1/123formbuilder with its own method and path, such as PATCH /api/v1/123formbuilder/forms/{form_id}/notification-email, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the 123FormBuilder API and MCP server do?

14 tools on your own 123FormBuilder account. Agents call them as operations of the MCP tools 123formbuilder_read and 123formbuilder_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
123FormBuilder tools in Cotlet's MCP server and REST API
Tool What it does Access
list_forms Forms of your account with id, name, state, folder and submission counts. read
get_form One form with its fields in order: label, type, required and instructions. read
list_submissions Submissions of a form with their answers, optionally from a date on. read
get_submission One submission with all its answers. read
list_notification_emails The emails a form sends on submit: name, recipients, subject and rules. read
get_publish_links The link to a form and its JavaScript embed code. read
update_submission Change answers in a submission, like Edit and Update Submission in Results. writeasks first
resend_submission Send a submission to your inbox again with one of the form's email templates. writeasks first
delete_submission Delete one submission from the Submissions tab. writeasks first
update_notification_email Change Send to and the subject of one email a form sends. writeasks first
add_form_field Add a field to a form in the Form Editor. writeasks first
update_form_field Change the label or the instructions of a field. writeasks first
set_form_active Turn a form on or off, like Deactivate in My Forms. writeasks first
duplicate_form Copy a form with all its settings, optionally under a new name. write

Scroll the table for all 14 tools.

Ask in plain words. Your agent does the rest.

All 123FormBuilder use cases

Is it safe to connect 123FormBuilder?

You sign in yourself in your own Cloud Browser, we never save your password, and anything that reaches your readers waits for your OK. The browser profile is encrypted in the EU. Independent scanners grade cotlet.dev A+.

Security overview

How much do the 123FormBuilder API and MCP server cost?

One price for both: a tool call costs the same over MCP or REST. Free 7-day trial with 2,000 credits, no card needed. Then one-time credit packs, no subscription, valid 12 months. Each call uses 10 credits, and your Cloud Browser uses 50 credits a day while 123FormBuilder is enabled for agents, so 20 calls a day come to 250 credits.

See full pricing
Cotlet credit packs: price, credits and calls at 10 credits each
Credits Price, one time Calls at 10 credits Per 1,000 credits
5,000 $29 500 $5.80
15,000 $79 1,500 $5.27
32,000 $149 3,200 $4.66
60,000 $249 6,000 $4.15

Only successful calls use credits; failed calls and timeouts cost nothing. At a balance of 0 calls pause, never a surprise charge. Authenticate with the Authorization: Bearer header.

Questions

Does 123FormBuilder have an API?

123FormBuilder has a REST API v2 with token login (checked 23 Oct 2026). It lists, creates, renames and deletes forms, reads form fields, reads and deletes submissions, and manages groups and subusers. It cannot add or change form fields, edit what a respondent submitted, change notification emails or resend one, and there is no official MCP server.

How do I get access?

Sign up free, open 123FormBuilder under Integrations in the console and press Request access. Your free trial starts with your account, no card needed.

Is the MCP server different from the API?

No, only the way in. Cotlet builds each integration as a REST API and puts an MCP server on top, so both have the same 14 tools, the same inputs and answers, one API key and one price. AI agents such as Claude, ChatGPT or Cursor use MCP; scripts, cron jobs and HTTP steps in n8n, Make or Zapier use the REST API.

What is the Cloud Browser?

Your own Chrome that Cotlet runs for you in the EU, around the clock. You open it from the console, sign in to 123FormBuilder yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so 123FormBuilder sees the browser you signed in with. Password saving is off and the profile is stored encrypted with AES-256-GCM.

Can my agent act without asking me?

Not on anything that reaches other people: update_submission, resend_submission, delete_submission, update_notification_email, add_form_field, update_form_field, set_form_active wait for your OK by default. You can switch that off per tool for scheduled runs.

Does the 123FormBuilder API work on the free plan?

Yes, with a daily cap. 123FormBuilder says the free Basic plan allows up to 100 API calls a day and paid plans have unlimited calls. Integrations such as Zapier use calls on every sync. Cotlet works in the signed-in app, not through the API, so that cap does not apply to it.

Can a deleted submission be restored?

123FormBuilder says its support can restore deleted entries within 30 days. Cotlet has no undo for delete_submission, so each delete waits for your OK by default.

Should I use a 123FormBuilder MCP server from GitHub instead?

Pick one if you want the code on your own computer and do not mind the upkeep: you install it, sign it in and fix it when 123FormBuilder changes. Pick Cotlet if you want it hosted and kept working for you.

Can I use it in n8n, Make or Zapier?

Yes. Add https://cotlet.dev/mcp/v1 in n8n's MCP Client node, or call the REST endpoints from an HTTP step in Make or Zapier.

Who runs Cotlet?

Cotlet is run by Take Group, a Polish software company working since 2019. Take Group runs about 3,200 websites on its own systems and has its own DevOps team for infrastructure security. We built and used integrations like this inside the company for years before opening them as Cotlet.

Is Cotlet affiliated with 123FormBuilder?

No. Cotlet is independent and not affiliated with 123FormBuilder.

Give your agent access to 123FormBuilder.

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