Stamp0

Announcing Stamp0 Free Forever: Unlimited Inboxes, Unlimited Emails

by Stamp0 Team

Today we're excited to announce that Stamp0 is free forever for receiving emails. Create unlimited inboxes, receive unlimited emails, no credit card required. Ever.

Why Free Forever?

Testing shouldn't have a paywall. Whether you're a solo developer writing your first E2E test, a startup building AI agents, or an enterprise team running thousands of tests daily-you should have access to reliable email testing infrastructure.

We believe the best way to build a great product is to get it into as many hands as possible. So we're removing the barriers.

What's Included in Free Forever

Unlimited inboxes - Create as many disposable inboxes as you need. One per test, one per user flow, one per CI run. No limits.

Unlimited email receiving - Every email that arrives at your Stamp0 inbox is captured and stored. Parse them via API, check them via MCP, integrate them into your tests.

Full API access - REST API for creating inboxes, fetching emails, and managing your testing workflow. Webhooks for real-time notifications.

MCP Server - Native support for AI agents via Model Context Protocol. Claude, GPT-4, and other MCP-compatible agents can interact with email directly.

Playwright, Cypress, Selenium integration - Works with all major testing frameworks out of the box.

Coming Soon: Pro Plan

While receiving emails covers most testing scenarios, some workflows need more. That's why we're building the Pro plan.

Send Emails Programmatically

Test your application's email parsing? Verify your spam filters? Simulate customer emails hitting your support system? Pro will let you send emails from your Stamp0 inboxes-perfect for testing inbound email flows.

AI agents will be able to send emails via MCP, enabling fully autonomous email-based workflows.

Phone Numbers for SMS Testing

This is the big one. OTP verification, SMS-based 2FA, phone number confirmation flows-they're everywhere in modern apps, and they're nearly impossible to test automatically.

Pro will include:

  • Disposable phone numbers - Just like our email inboxes, but for SMS
  • SMS receiving - Capture incoming text messages via API
  • OTP extraction - Automatically parse verification codes
  • MCP support - AI agents can request phone numbers and read SMS just like they do with email

Imagine your test:

const inbox = await stamp0.createInbox();
const phone = await stamp0.createPhoneNumber();

// Sign up with both email and phone
await page.fill('#email', inbox.email);
await page.fill('#phone', phone.number);
await page.click('button[type="submit"]');

// Get email verification
const email = await stamp0.waitForEmail(inbox.id);
const emailCode = email.body.match(/\d{6}/)[0];

// Get SMS verification
const sms = await stamp0.waitForSMS(phone.id);
const smsCode = sms.body.match(/\d{6}/)[0];

// Complete verification
await page.fill('#email-code', emailCode);
await page.fill('#sms-code', smsCode);

Or with an AI agent:

Agent: "I need to test the signup flow. Creating email inbox and phone number..."
[Uses stamp0_create_inbox and stamp0_create_phone tools]

Agent: "Filling signup form with test credentials..."
[Completes form]

Agent: "Checking for verification codes..."
[Uses stamp0_get_emails and stamp0_get_sms tools]

Agent: "Got both codes. Email: 482917, SMS: 739284. Completing verification."

Pro Pricing

We're still finalizing pricing, but our goal is to keep Pro accessible. Expect simple, predictable pricing based on usage-no surprise bills, no enterprise sales calls required.

Get Started Today

The free plan is live now. Sign up, create your first inbox, and start testing in minutes.

  1. Create your account
  2. Generate an API key
  3. Create an inbox via API or MCP
  4. Start receiving emails

No credit card. No trial period. No catch.

What's Next

Follow along with our progress:

Have a feature request? We're listening. Email testing, SMS testing, and whatever comes next-we're building the infrastructure that modern testing needs.

Welcome to Stamp0.