RelayZeroOpen app

SMS-FIRST · LOCAL CUSTODY · CHAIN 4663

Send money when the internet can't.

RelayZero turns a verified phone into a tightly bounded control surface for native ETH—while the recovery key stays with you.

Open RelayZero Read documentation
Ethereum logoSettles nativeETHTwilio logoCarrier messagingPowered by Twilio

Offline devices can prepare and carry signed intent. Mainnet settlement begins only when a connected relay reaches Robinhood Chain.

Checking live servicesReading the web, storage, RPC, carrier, and execution paths.
View system status

Built for unreliable connectivity

One wallet. Four controlled paths.

Every transport ends at the same security boundary: an exact recipient, exact amount, explicit caps, and truthful settlement state.

01

Pay by ordinary SMS

Text an exact command, receive an expiring quote, then reply with one bounded confirmation code.

Cellular, not mobile data
02

Send to a phone

Registered users can pay another private phone binding without copying a public wallet address.

Private directory
03

Send to any EVM address

Direct 0x recipients stay available when a phone-directory lookup is not the right route.

Native ETH
04

Bounded smart wallet

Per-payment, daily, lifetime, and network-fee caps constrain what the SMS executor can do.

Revocable policy
05

Prepare while offline

The installed PWA can prepare and carry signed intent by QR, file, NFC, or local sharing.

Relay settles later
06

AI that cannot spend

DeepSeek through OpenRouter explains the product and creates reviewable drafts without wallet access.

Proposal only
RZOC

RELAYZERO × OFFCHAIN

Two approaches. One offline-first payment future.

RelayZero is proving bounded ETH execution through ordinary SMS on Robinhood Chain. OffChain is building a wider encrypted coordination stack around SMS, NFC, mesh transport, privacy, and AI agents. Our collaboration explores how these complementary systems can make crypto useful beyond a continuous internet connection.

SMS executionNFC commerceEncrypted coordinationAgent interfaces
Read the collaboration brief

Product walkthrough

See a payment leave the browser—and finish by SMS.

Watch the complete RelayZero flow, from web setup and SMS authorization to a confirmed Robinhood Chain payment.

From setup to finality

Seven steps. No hidden signer.

The phone is an authenticated command channel—not a replacement for the recovery owner or the chain.

  1. 01

    Connect locally

    Create or connect a recovery wallet. Secret material stays encrypted on this device.

  2. 02

    Verify your phone

    Bind one phone identity to the owner wallet through a non-spending signature.

  3. 03

    Approve hard limits

    Deploy the bounded SMS wallet with transaction, daily, lifetime, and fee caps.

  4. 04

    Fund the SMS wallet

    Move only the ETH intended for SMS-controlled spending into the smart wallet.

  5. 05

    Text SEND

    Address a registered phone or an exact 0x recipient from the verified number.

  6. 06

    Reply YES + code

    Approve one quoted transaction before its short confirmation window expires.

  7. 07

    Track confirmation

    RelayZero reports submission separately from Robinhood Chain mainnet finality.

SMS command API

Exact commands your phone can send

After a verified phone is linked, text these command bodies from that number.

BALANCERead the funded SMS smart-wallet balance.
P 0.001 0x…Short command to send ETH to an EVM address.
P 0.001 +1…Short command to send ETH to a registered phone.
SEND 0.001 ETH TO +1…Prepare an exact payment to a registered phone.
SEND 0.001 ETH TO 0x…Prepare an exact payment to any EVM address.
LIMIT PAYMENT 0.002Raise or lower per-payment cap within hard limits.
LIMIT DAILY 0.005Raise or lower daily cap within hard limits.
LIMIT LIFETIME 0.01Raise or lower lifetime cap within hard limits.
LIMIT FEE 0.0001Raise or lower fee cap within hard limits.
YES 9702Approve the quoted transaction once the code is returned.
NOCancel the current pending quote.
HISTORYShow recent SMS payment and confirmation states.
ASK how does RelayZero work?Ask the product support assistant for help.
LOCKDisable SMS spending immediately.
HELPReplay the supported command list.

SECURITY MODEL

Permission without custody.

The SMS executor receives a narrow on-chain permission. It cannot raise caps, replace the owner, recover the wallet, or move recovery-wallet funds.

  • Local encrypted recovery key
  • Separate bounded spending wallet
  • Replay and expiry protection
  • Immediate LOCK and owner recovery
Read the security model
Phone identityVerified channel
Bounded policyImmutable ceilings
Mainnet relayConnected settlement
Recovery ownerIndependent control

RELAYZERO WEB WALLET

Keep control when connectivity changes.

Set up a recovery wallet, bind your phone, and choose exactly how much the SMS route may move.

Open RelayZero Explore the docs