Accept your first payment
- Sign up at pay.u.cash and create a store.
- Connect a wallet, such as an EVM address or a Bitcoin xpub.
- Add your card-processor keys if you want to take cards.
- Share your checkout link or embed the widget.
Start here to get the most out of U.CASH. Each guide links to the live app and its developer documentation.
The same four steps power every app. Set up once, then the whole network is one click away.
Sign up once at the U.CASH Portal. One login spans pay, swap, buy, names, agents, send, and verify.
Add addresses you already control: Bitcoin xpubs, EVM, Solana, Tron, and more. Optionally add card-processor keys for cards.
Accept a checkout, swap a token, buy UCASH, claim a .u name, or put an agent on HTTP-402. Start anywhere.
Money lands in wallets you control, never on U.CASH. Signed webhooks confirm each step in your own systems.
Three things you can do in the next few minutes, right from the live apps.
Set up a checkout, connect wallets, add a card processor, and get paid. Read the guide → Open Pay
Trade across 35 networks non-custodially and understand the 0.50% all-in fee. Read the guide → Networks
Buy the network access and loyalty token in one step, non-custodial. Read the guide → About UCASH
Get a .u or @u name and point it at your wallets. Read the guide → Names
Put an AI agent on HTTP-402 and sell per request. Read the guide → Agent docs
Install a plugin or use the universal embed. Read the guide → Checkout Plugins
What tokenized stock is, what it is not, and the swap from any asset to any of 238 underlyings. Read the guide → The biggest
Pick the peg that matches your invoice across 13 families and settle without volatility. Read the guide → Ranked by peg
M-Pesa, PIX, UPI, SEPA: value from crypto balance to the rail your money lives on. Read the guide → All rails
Payroll runs, marketplace settlements, airdrops: many wallets, one flow. Read the guide → Payouts
Cards through your own processor plus 22 local bank rails behind one checkout. Read the guide → Payment options
PAXG, XAUt, KAG: what backs them, how the peg works, and paying with metal. Read the guide → Gold
Fiat ramp or swap, both settling to your own wallet: the two roads to your first BTC. Read the guide → BTC
BTC at checkout: on-chain or Lightning, hold or auto-convert, non-custodial throughout. Read the guide → Accept BTC
The reference, the amount, the asset: paying B2B invoices so the payee's books reconcile. Read the guide → Invoicing
Crypto checkout to a wallet you control, with local payout rails for the last mile. Read the guide → By country
Platform fee, swap fee, network fee, lined up against the card statement honestly. Read the guide → Pricing
SPY, QQQ, and sector funds as on-chain tokens: the mechanics and the fine print. Read the guide → Classes ranked
REST API, signed webhooks, and checkout flows. pay.u.cash/docs →
JavaScript and Python SDKs on npm and PyPI. agents.u.cash/docs →
U.CASH never holds your funds or your keys. Payments settle straight to wallet addresses you control, so there is no central pool to lose. See the definition and Technology.
Retail merchants who use U.CASH Pay to move cash and crypto for customers in person, a real-world on and off ramp alongside the digital rails. See Network.
The standard that turns any URL into a priced resource. An agent gets a 402 Payment Required, pays, retries, and gets through automatically. See the definition and Agents.
The network access and loyalty token of the ecosystem: an ERC-20 on Ethereum, Polygon, and Base, used for access, discounts, and rewards. See UCASH token.
Human-readable identities like .u and @u that resolve to a wallet address, so you can pay a name instead of pasting hex. See the definition and Names.
Every term, A to Z: stablecoins, token standards, DEX routing, finality, payment rails, and more. See the glossary.
The moment a payment is final on its chain. You set confirmation policies per coin to balance speed against finality. See the definition and Technology.
Have a question? Check the FAQ or contact us.
Create your account once, then pay, swap, buy, or name in minutes.