uu.cash
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Universal Cash · the network

One account.
Every U.CASH app.

Accept crypto and cards, swap and buy UCASH, pay with AI agents, claim a .u name, and verify your holdings — one U.CASH account across every app.

Log in → Explore the apps
650K+
Network users
300K+
UCASH holders
20+
Chains supported
2017
Building since
Flagship · pay.u.cash

Accept crypto and cards in one checkout

The U.CASH payments rail — 30+ blockchains and custom tokens across 22 networks, fiat cards via Stripe, white-label and non-custodial. Accept, request, invoice, and even pay out cash for crypto in person. Live in minutes, no held funds.

Unified checkout

One link or widget accepts every coin and card. Customers choose; you get paid.

Multi-coin wallets

Connect xpubs and per-chain wallets. Funds settle directly to addresses you control.

Cards via Stripe

Fiat cards through your own Stripe account — fully non-custodial, no middleman.

White-label

Your logo, colors, and domain. The payment surface is yours — we're the rails.

Webhooks & API

REST API, signed webhooks, and SDKs. Build invoicing, splits, and any payment flow.

Non-custodial

We never hold your funds. Payments settle straight to your wallets — by design.

Multi-store

Run many stores from one account — each with its own branding, wallets, and webhooks.

Requests & invoices

Email a Pay-Now link or a full invoice — get paid without a storefront.

Email & receipts

Automatic merchant notifications and customer receipts, via your own SMTP.

Cash for crypto, in person

Payout Info Requests — a built-in OTC desk

Request a customer's crypto wallet (or PayPal email) through a no-login form. They submit it, you pay out cash face-to-face and mark it sent. Retail fiat↔crypto, merchant-mediated — no extra integration.

Try it →
Start accepting → API & docs
Networks & tokens

30+ blockchains. Custom tokens on 22 networks.

Built-in support for Bitcoin, Ethereum, Solana, Tron, and 25+ more — plus any custom token across 22 networks, including 12 newly-added EVM chains: Linea, Mantle, Berachain, Sonic, Unichain, Worldchain, Monad, Plasma, Abstract, HyperEVM, Scroll, and Ink.

BTC
BTC
Lightning
Lightning
ETH
ETH
SOL
SOL
TRX
TRX
XRP
XRP
LTC
LTC
DOGE
DOGE
BCH
BCH
XMR
XMR
ALGO
ALGO
DOT
DOT
XLM
XLM
XTZ
XTZ
Base
Base
Arbitrum
Arbitrum
Optimism
Optimism
Polygon
Polygon
BNB Chain
BNB Chain
Avalanche
Avalanche
Linea
Linea
Mantle
Mantle
Berachain
Berachain
Sonic
Sonic
Unichain
Unichain
Worldchain
Worldchain
Monad
Monad
Plasma
Plasma
Abstract
Abstract
HyperEVM
HyperEVM
Scroll
Scroll
Ink
Ink

Custom tokens

Add any token by wallet + contract across 22 networks — ERC-20, BEP-20, Base, Polygon, Arbitrum, Optimism, TRC-20, SPL, and 12 new EVM chains.

Per-coin confirmations

You define what "paid" means — set confirmation policies per coin, per store.

xpub & Lightning

Bitcoin HD wallets via xpub, plus Lightning support — generate receive addresses without holding keys.

Web3-name payouts

Pay to ENS, Unstoppable Domains, and FIO handles — no copy-pasting long addresses.

The U.CASH apps

Everything we do on U.CASH

Six apps, one account. Each lives on its own u.cash subdomain — pick where to start.

pay.u.cash — Accept payments

Crypto and cards in one white-label, non-custodial checkout. Hundreds of coins across 20+ chains.

Flagshippaymentscards via Stripe

swap.u.cash — Swap crypto

Swap between cryptocurrencies directly from your wallet — non-custodial, multi-chain.

exchange

buy.u.cash — Buy UCASH

Buy UCASH with crypto — the buy-UCASH flow of swap.u.cash. Fast, non-custodial.

buy UCASH

names.u.cash — Web3 names

Claim a .u domain (Unstoppable Domains), @u handle (FIO), and other UCASH web3 names.

.u@udomains

agents.u.cash — AI payments

HTTP 402 — let AI agents pay per request, on-chain or via their own Stripe. Non-custodial.

HTTP 402AI

verify.u.cash — Verify

Verify your UCASH balance and email address to unlock benefits and premium features.

verify
Why U.CASH

The same principles across every app

Non-custodial

Your keys, your funds. No U.CASH app ever holds your money — payments settle to wallets you control.

Multi-chain

Ethereum, Polygon, Base, Bitcoin, Solana, and more — 20+ chains supported out of the box.

One account

A single U.CASH account works across pay, swap, buy, names, agents, and verify.

Open by default

Open APIs, open standards (UCP, HTTP 402), and interoperable web3 names. Build on U.CASH without lock-in.

The network token

UCASH — power every app

UCASH is the U.CASH network token. Buy it, swap it, hold it, and use it across pay, swap, names, agents, and more.

Official contracts

Multi-chain by default

UCASH lives on Ethereum, Polygon, and Base. Always verify the address before trading.

Buy UCASH → Swap
ERC-200x92e52a1a235d9a103d970901066ce910aacefd37
POLYGON0xa94880d3a4b39746e90cdb57f8de3732c984de14
BASE0x26cf750abaf38af7109effdbdf79ba50d2ee09a1

One U.CASH account. Manage it all.

Sign in to the portal to manage your account, wallets, and bounties — across every U.CASH app.

Log in to the portal →
FAQ

Questions, answered

What is U.CASH?
U.CASH is a network of apps — pay.u.cash (accept payments), swap.u.cash (swap crypto), buy.u.cash (buy UCASH), names.u.cash (web3 names), agents.u.cash (AI payments), and verify.u.cash (verify holdings). One account works across all of them.
Do I need a separate account for each app?
No. One U.CASH account — managed in the portal at portal.u.cash — works across pay, swap, buy, names, agents, and verify.
Is U.CASH custodial?
No. U.CASH is non-custodial by design — your keys, your funds. Payments settle directly to wallets you control.
How do I buy UCASH?
At buy.u.cash — the buy-UCASH flow — or swap for it at swap.u.cash. UCASH is available on Ethereum, Polygon, and Base.
What is a .u name?
A web3 identity at names.u.cash — claim a .u domain via Unstoppable Domains, an @u handle via FIO, and other UCASH web3 names. Your name is your identity and your payment address.
How do I accept payments?
At pay.u.cash — create a checkout that accepts hundreds of coins plus fiat cards, white-label and non-custodial. Live in minutes.