Postbox is a structured data collection API. You define a schema, get an API endpoint, and start collecting data. It includes AI-powered spam detection, automatic translation, and smart replies.

How is Postbox different from other form tools?

Postbox is API-first, built for developers and AI assistants. It includes intelligence features (spam detection, translation, smart replies) and integrates with AI tools via llms.txt and MCP server.

How much does Postbox cost?

Postbox has a free tier (1 form, 500 submissions) and a Pro tier at $9/month or $99/year for unlimited forms and submissions. AI features are pay-as-you-go.

Your Data Collection – Autopiloted.

Spam filtering, translation, and smart replies built-in.
All the infrastructure, none of the maintenance.

Start for free description View Docs

Your Form

Submit

Postbox AI

shield Spam

translate Translate

bolt Reply

Dashboard

conversion_path THE PIPE

Dead-Simple API.
Structured Data.

Stop building backends for simple forms. Define your data shape with a JSON schema, and we give you a production-ready endpoint instantly.

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Schema Validation We reject bad data before it hits your DB.
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Instant Endpoints No deployments. Just hit save.
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Developer First CORS support, webhooks (soon), and clean JSON.

schema.json response.json

// Define your structure
{
  "name": "waitlist-signup",
  "fields": [
    {
      "name": "email",
      "type": "email",
      "required": true
    },
    {
      "name": "role",
      "type": "string",
      "options": ["dev", "designer"]
    }
  ]
}

psychology INTELLIGENCE LAYER

Let AI Handle the Noise

Submission #1024

SPAM

AI Confidence

98%

shield AI Spam Filter

More than a honeypot. We use LLMs to analyze context and intent, filtering out spam that standard captchas miss.

Japanese (Original)

製品の価格はいくらですか？

arrow_downward

English (Auto)

How much does the product cost?

translate Auto-Translation

Go global instantly. Incoming submissions are automatically translated to your preferred language, side-by-side with the original.

Drafting response...

library_books Sourced from Knowledge Base

bolt Smart Replies

Define a Knowledge Base and let Postbox draft (or auto-send) intelligent replies to common questions.

BUILT FOR AGENTS

Speak the Language
of your AI Assistant.

Postbox is built for the "vibe coding" era. We provide a first-class llms.txt file and an MCP server, so tools like Cursor, Bolt, and Replit Agent can understand and manage your data without you leaving the editor.

terminal Cursor

bolt Bolt

code Replit Agent

smart_toy @Postbox /list_submissions

Show me the last 3 submissions for the contact form.

I've queried the Postbox MCP server.

// Result from MCP Tool

[ { "id": "sub_1", "email": "alice@corp.com", "spam": false }, { "id": "sub_2", "email": "bob@agency.io", "spam": false }, { "id": "sub_3", "email": "spambot@xyz.ru", "spam": true } ]

It looks like one of them was flagged as spam automatically.

Simple Pricing

Free

$0/mo

Perfect for side projects and prototypes.

Start Free

check 1 Form
check 500 Submissions
check Basic Spam Protection
check Pay-as-you-go AI features

Pro

$9/mo

For serious builders and production apps.

Upgrade to Pro

check Unlimited Forms
check Unlimited Submissions
check Access to MCP Server
check Permanent Data Retention
check Pay-as-you-go AI features