You keep rebuilding what happens after submit.

Postbox is the post-submit layer you need. One endpoint, any source — forms, scripts, agents. Your data arrives validated and clean — and your agents can manage it all.

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website

Name

Alice

alice@acme.co

Submit

✓ Submitted

tool

$ curl -X POST \

usepostbox.com/api/… \

-d '{"name":"Alice",

"email":"alice@acme.co"}'

$ ▌

► 201 Created

agent

Book a table for Alice, alice@acme.co

Submitting to Postbox...

✓ Sent via MCP

postbox

New submission

name Alice

email alice@acme.co

✓ validated · clean

How it works

Three steps. No infrastructure.

Define your fields.

Forms in Postbox are structured — you define the fields you want to collect, with full control over their types and validations. Read why this matters.

Submit from anything.

One endpoint, any source. HTML forms, cURL & scripts, AI agents, MCP clients — same schema enforcement, every time.

Data arrives clean.

Submissions are validated against your schema first — bad data is rejected instantly. What passes goes through spam filtering, auto-translation, and smart replies. All configurable per form.

Iterate freely

Change anything. Break nothing.

You ship the survey.

Name, email, message. Your app and website go live. You grab your coat, ready to leave.

Live

website + app

endpoint

name

message

"We need their company name."

The sales guy rushes in, panicking. You tell him to breathe. You add the field, update your form on Postbox. Commit, push, deploy. Seconds.

Live

new endpoint

name

message

company

But wait, what about the app?

The website has the new field. The app doesn't yet. Normally, that's a breaking change. Not with Postbox. Every change creates a new endpoint. Every previous endpoint keeps working. Nothing breaks.

Live

app

name

message

Live

website

name

message

company

After submit

What happens to your data.

Alice from Acme Co

Interested in your Pro plan...

clean

Buy cheap followers now!!!

Visit http://spam-link.xyz...

spam

Marco from Berlin

Quick question about pricing...

clean

Spam never reaches you.

Every submission is scored before you see it. Standard filtering catches bots and disposable emails. Intelligent goes deeper with AI.

Informe de error

Spanish

Fehlerbericht

German

バグレポート

Japanese

English — translated

Bug Report

The login page returns a 500 error when...

Submissions arrive in your language.

Auto-detected. Auto-translated. Originals always preserved. Respond to anyone, from anywhere.

Submission

Do you offer a discount for nonprofits?

Draft reply via knowledge base

Yes! We offer 50% off for registered nonprofits. Just send us your...

Send

Edit

Replies draft themselves.

Connect a knowledge base. Postbox drafts contextual replies. Review and send, or let it handle everything.

Use cases

One endpoint. Every source.

Agent → Agent

The RSVP That Ran Itself

Your OpenClaw plans a dinner for 30. Creates a form on Postbox, sends each guest's agent the endpoint. RSVPs flow in structured. Zero humans opened a browser.

Alice's

Bob's

Postbox

Carol's

Dave's

Alice — Attending

Vegetarian, +1

Bob — Attending

No dietary, +0

Carol — Maybe

Gluten-free, +1

26 more...

Human + AI

We Have Typeform at Home

Prompt a beautiful form with your favorite tool. Connect it to Postbox. Prettier, cheaper, and does things Typeform can't.

Typeform $50/mo

Their branding

Their UI

No spam filtering

No translation

AI + Postbox $0

Your design

Your UI

Spam filtering

Translation + replies

Marketers

The Lead That Qualified Itself

Leads flow in from your landing page. Spam and junk filtered before you see them. What hits your dashboard is clean and ready to act on.

Sarah, VP at Stripe

lead

FREE CRYPTO CLICK HERE

spam

James, Founder at Acme

lead

Product Teams

The Feedback Loop

Ship a feedback button. Your agent summarizes the week's submissions every Monday. You read a paragraph, not 200 entries.

Weekly summary via MCP

47 submissions this week. Top request: dark mode (12 mentions). 3 bug reports on checkout flow. Sentiment: 82% positive.

Full Autopilot

Set It and Forget It

Tell your agent to set up feedback for the beta. It creates the form, drops the endpoint in, collects responses. You never opened the dashboard.

✓ Created form beta-feedback

✓ Endpoint live .../f/beta-feedback

✓ Spam protection standard

● Collecting... 23 submissions

For agents

Built for agents from day one.

Postbox ships with an MCP server, a Skill, and Agent Native documentation.

Connect from any MCP client.

json

{ "mcpServers": { "postbox": { "type": "http", "url": "https://usepostbox.com/mcp" } } }

OAuth 2.1 with PKCE. Scoped to your account. Requires Pro.

What your agent can do.

list_forms — See all your forms.

get_form — Read schema and settings.

list_submissions — Filter by inbox, spam, or all.

get_submission — Full submission detail.

translate_submission — Translate on demand.

analyze_spam — Check any submission.

draft_reply — Generate a reply from your knowledge base.

summarize_submissions — Get patterns and insights.

Pricing

Start free. Scale when you're ready.

Free

1 form
5,000 lifetime submissions
50 AI credits

Get Started

Popular

Pro

$19 /mo

$199/yr — save 13%

Unlimited forms
Unlimited submissions
MCP server access
Priority support
500 AI credits/month
Metered after 500

Start Free Trial

FAQ

Questions? Answers.

What is Postbox?

Postbox is an agent-native data collection platform. Define your fields, get an endpoint, and receive structured data from forms, scripts, or AI agents. Spam detection, translation, and smart replies are built in.

How do AI agents submit data?

Agents POST JSON to your endpoint. The same URL a form would use. They can discover your schema via llms.txt or through the MCP server. No SDK required. Just a standard HTTP POST.

What is MCP and why does it matter?

MCP (Model Context Protocol) lets AI assistants connect to external tools. Postbox's MCP server means your assistant can create forms, query submissions, and manage data without leaving your editor. Available on Pro.

Do I need to be a developer?

Not at all. Create forms and manage submissions through the dashboard without writing code. Developers and agents get extras like API access, schema versioning, and MCP, but they're not required.

What AI features are included?

Every account gets AI spam detection, auto-translation, and smart replies. These run on credits. Free includes 50 one-time credits to experience the full product. Pro includes 500/month with metered billing after that. Standard spam protection (heuristics, honeypot, content moderation) is always free and doesn't use credits.

How is this different from Typeform or Google Forms?

Those are form builders that create frontend experiences. Postbox is the layer that receives and processes data. You build your own UI, prompt one into existence, or skip UI entirely and let agents submit directly. We handle what happens after submit: validation, spam filtering, translation, replies.

Internal security audit — February 2026. Zero critical findings.

TLS everywhere. Encrypted sessions. Data Isolation Guarantees upheld.

Experience Agent-native data collection.

bash

curl -X POST https://usepostbox.com/api/.../f/{slug} \ -H "Content-Type: application/json" \ -d '{"name": "Your Name", "message": "Your Message"}'

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