Private payments,
sent by text.
Hvisk lets anyone send confidential payments over plain SMS. No internet, no app, no exposed amounts. Signed on your phone, verified with zero-knowledge proofs, settled on Solana.
- from
- ███████
- to
- ███████
- amount
- █████ USDC
Nothing exposed on-chain.
Tap a level. The chain view updates.
How it works
Three steps,
end to end.
- 01
Sign on your phone.
Type a payment into your messages app. Your phone signs locally with a key that never leaves the device, and wraps the intent in a zero-knowledge proof.
- 02
Send it as an SMS.
The signed proof fits in a single text. It travels over GSM. No internet, no Wi-Fi, no app. It queues the moment you have any cellular signal.
- 03
Settle on Solana.
Our relayer picks up the message and broadcasts it. Validators verify the proof and confirm settlement in under two seconds. Amounts and balances stay hidden.
Product
One privacy layer.
Three ways to pay.
Public blockchains exposed every payment to the world. Hvisk uses zero-knowledge proofs to make them verifiable, without revealing anything.
Coverage
Where this
actually matters.
Emerging markets.
Most of Sub-Saharan Africa, Southeast Asia, and Latin America has reliable cellular coverage. Mobile data, less so. Hvisk gives those 2.6 billion people a wallet that needs neither.
Disaster zones.
When data networks fail or are jammed, GSM signaling typically remains. Relief workers and affected populations keep moving money over the carrier layer.
Censored regions.
Where crypto traffic is monitored or blocked at the IP layer, an SMS routes around it. The carrier sees a normal text. Nobody sees the amount.
Autonomous agents.
Machines settle x402 invoices over the same private rails. By API when bandwidth allows, by SMS gateway when it doesn't.
FAQ
Questions,
answered.
Hvisk is an SMS-native payment layer with built-in zero-knowledge proofs. Anyone can send and receive private payments over plain SMS. No internet, no app, no exposed amounts. Each message carries a ZK proof, signed locally on your phone and settled on Solana in under 2 seconds.
Money should move
like a whisper.
Reachable by anyone. With or without internet. Settled on Solana. Read by no one.