Swap as a Service

Embed Crypto Exchange.
No KYC. Ever.

Add a privacy-first crypto swap widget to any website in 30 seconds. Your users exchange BTC, ETH, USDT, XMR and 4,600+ coins — you earn from every trade. No custody. No compliance. No code required.

Start Free How it Works
Try Full Demo →
16 engines
4,600+ coins
10 languages
Zero KYC
No KYC Required
Zero identity verification
No Logs
No data retention or tracking
Crypto-Native Payments
Pay with crypto, earn in crypto
Open Engine Architecture
BYOK — bring your own API keys
Why 404.cash

Everything You Need to Monetize Crypto Swaps

A complete swap infrastructure that embeds into any website, app, or platform

Zero KYC

No identity verification. No documents. No data retention. Built for privacy-first platforms that respect their users.

30 Second Setup

Copy one HTML snippet. Paste it into your site. Widget auto-initializes with your config from the merchant portal. Done.

Earn Per Swap

Bring your own exchange keys (BYOK) to earn directly, or use our keys and earn referral commissions. Your swaps, your revenue.

Multi-Provider Aggregation

Aggregates rates from 16 non-KYC exchange engines. Best rate wins automatically. Built-in redundancy and failover.

Ghost Mode

Optional privacy routing through Monero (XMR). Breaks the on-chain link between input and output for maximum privacy.

Fully Customizable

Dark and light themes. Custom accent colors. Domain restrictions. Provider filters. Custom CSS injection. All from the portal.

Integration

From Zero to Earning in 5 Minutes

Four steps to add a crypto swap to your website

1

Register

Create an anonymous merchant account. No email required. Get your widget key instantly.

2

Configure

Create a widget. Choose coins, providers, theme. Add your own engine keys (BYOK) or use ours.

3

Embed

Copy two lines of HTML. Paste into your site. The widget renders and connects automatically.

4

Earn

Track swaps, volume, and earnings in your merchant dashboard. Withdraw to any address, anytime.

Theming

Adapts to Your Brand

The widget ships with dark and light themes, custom accent colors, and full CSS override support

your-site.com
404.cash Widget
BTC → ETH
Best rate from 16 engines
Swap Now
Dark Theme
your-site.com
404.cash Widget
USDT → XMR
Best rate from 16 engines
Swap Now
Light Theme
Developer-Friendly

Embed in Seconds

Two lines of HTML. Or use the JavaScript API for full programmatic control.

<!-- 404.cash Swap Widget -->
<div data-swap-widget
     data-widget-key="wk_your_key_here"
     data-theme="dark"></div>
<script src="https://404.cash/widget.iife.js"></script>
Or use the JavaScript API:
SwapWidget.init({
  container: '#my-swap',
  widgetKey: 'wk_your_key_here',
  theme: 'dark',
  allowGhost: true,
});
Pricing

Volume-Based. No Subscriptions.

Pay as you grow. One-time payment or volume threshold — whichever comes first.

Free
$0
10 free swaps included
  • ✓ 1 widget
  • ✓ 6 default coins
  • ✓ Standard providers
  • ✓ Powered by 404.cash badge
  • ✓ Earn referral commission
Get Started
Most Popular
Pro
$200
one-time or $500K volume
  • ✓ 0.15% platform fee
  • ✓ 5 widgets
  • ✓ 4,600+ coins
  • ✓ BYOK (3 engines)
  • ✓ Ghost mode
  • ✓ Custom theme + CSS
  • ✓ Hide branding
  • ✓ Webhooks
Upgrade
Max
$1,000
one-time or $5M volume
  • ✓ 0.08% platform fee
  • ✓ Unlimited widgets
  • ✓ BYOK (all engines)
  • ✓ Custom domain
  • ✓ White-label (no branding)
  • ✓ Priority support
  • ✓ Everything in Pro
Upgrade
FAQ

Common Questions

Everything you need to know about 404.cash

What is 404.cash?
404.cash is a Swap-as-a-Service platform that lets you embed a no-KYC crypto exchange widget on any website. It aggregates rates from 16 exchange engines covering 4,600+ coins, and merchants earn revenue from every swap their users make.
How do merchants earn money?
Merchants earn in two ways: bring your own exchange API keys (BYOK) and keep 100% of provider commissions, or use our shared keys and earn a referral split. Both models are supported per widget.
What is BYOK (Bring Your Own Keys)?
BYOK lets Pro and Max merchants use their own API keys from supported exchange providers. This gives you direct access to provider rates, higher limits, and full control over your swap infrastructure.
Which cryptocurrencies are supported?
404.cash supports over 4,600 cryptocurrencies across 16 exchange engines, including BTC, ETH, USDT, USDC, XMR, SOL, and thousands more. The multi-provider architecture ensures maximum coverage and best rates.
Is KYC required to use 404.cash?
No. 404.cash is built for privacy. No identity verification, no documents, no data retention. Merchants create anonymous accounts and their users swap without any KYC requirements.
How does Ghost Mode work?
Ghost Mode routes swaps through XMR (Monero) as an intermediate step, breaking the on-chain link between input and output. The swap is split into two legs: your input coin to XMR, then XMR to your output coin. This provides maximum privacy for untraceable transactions.
What are the platform fees?
Free tier includes 10 swaps at no cost. Pro tier ($200 one-time or $500K volume) charges 0.15% per swap. Max tier ($1,000 one-time or $5M volume) charges just 0.08% per swap. No subscriptions, no recurring charges.
Can I use my own domain?
Yes. Max tier merchants can use a custom domain for their widget, providing a fully white-labeled experience with no 404.cash branding visible to end users.

Ready to Monetize Swaps?

Free tier includes 10 swaps. No credit card. No email. No KYC. Obviously.

Create Merchant Account