TELRPC Wallet
Your keys are born on your phone and never leave it. Payments go out as an ordinary phone call.
- No internet permission, four permissions in all
- Send, swap and send to many, all over a call
- Signed APK today. iOS coming soon
The rails that never go online.
Completely offline rails for crypto, and a self-custody wallet with no internet at all. Signed offline, sent as a phone call, settled on-chain.
0
bytes of internet data from the wallet app
93
countries with local numbers available, plus a US line
~95 s
of tones for a USDC payment on Base
4
app permissions: phone, camera, biometric unlock and ending its own call
One rail.
Four ways in.
The same rail serves the person holding their own savings, the company that builds their wallet, the developer wiring it into a product and the treasury moving value at scale.
TELRPC INSIDE
For wallet makers. Keep your signer exactly as it is and hand the last online step to a call.
- Carry the rail in your app or build it into your hardware
- A whitelabel app, or plug straight into the grid
- Wholesale per broadcast, your resale price on top
TELRPC protocol and API
For developers. Frame a signed transaction, key the tones, read state by QR or echo.
- Verify every confirmation on the device
- A keyed JSON API for clients, usage and broadcasts
- Licensed to partners
TELRPC Console
For institutions. Broadcast from the cold side, with no networked broadcast host.
- Allowlisted treasury addresses
- A seat register with roles, and a full audit log with CSV export
- Committed capacity and SLAs under contract
See it in under two minutes.
What TELRPC is, why a phone call is enough, and how your key stays offline the whole time.
Under two minutes, sound on.
Sign, call, settle.
No internet on the device.
From the phone that signs to the chain that settles, and back to the phone with a receipt it checks itself.
The phone signs
You check every line and hold to sign. The key never leaves the phone.
A call carries it
Framed, checksummed and keyed as tones. About 95 s for USDC on Base.
The grid broadcasts
It rebuilds the exact bytes and sends them unchanged. It holds no keys.
The chain settles
The account pays its own network fee. No TELRPC contract anywhere.
The echo comes home
The grid calls back with a reference in the caller ID. It never rings.
1
Sign on the phone
The wallet signs on a device with no internet permission. The signature binds the payee and the amount, so nothing that follows can change either.
2
A call carries it
An ordinary voice call carries the signed transaction as tones, each frame guarded by a checksum. A lost tone or a dropped call is refused and redialled, never broadcast twice.
3
The grid broadcasts it
The grid broadcasts it unchanged and confirms by echo: a silent callback the wallet checks against the transaction it computed.
Hear a payment leave the phone.
This is a real TELRPC frame, keyed as the tones the call carries. Sound plays only when you press.
*103175824609317#
One payment,
start to finish.
A real payment on 11 October 2026, exactly as the phone showed it. One USDC on Base, sent from a phone with no internet permission, under three minutes from opening the send screen to the confirmation on the device.
1. Enter the payment
Asset, payee and amount. The account's sequence and fee are already on the phone, synced offline.
2. Check every line
Amount, recipient, network and fee. Placing the call signs it on the device; the key never leaves it.
3. An ordinary call
The signed transaction travels as tones, about 95 seconds for a USDC transfer. The grid checks the checksum and broadcasts the exact bytes.
4. Confirmed by echo
The grid calls back with a reference to the transaction id in the caller ID. The wallet matches it to the id it computed itself.
On-chain at 09:18:25 UTC, 11 October 2026, block 52460479: 0x54cc6d…78b1a7 on BaseScan. Phone clock shows local time (UTC+2).
No IP address.
No browser.
No Wi-Fi.
The TELRPC Wallet holds four permissions: phone, camera, biometric unlock and ending its own call if the network doesn't. None of them can open a network connection, so the operating system gives the app no network access for as long as it is installed.
- The signature binds the payee and the amount
- A changed byte fails the signature
- The grid holds no keys and deploys no contract
- A compromised line can delay a payment, not redirect it
Self-custodyKeys are born on the phone and stay there.
No accountNo sign-up and no email. The app sends no data.
Check it yourselfOne command reads the permissions back from the app.
Patent pendingRPC by telephone, a call to the chain.
Works withLedgerTrezorBitBox02KeystonePassportJade
Already keep your coins on a hardware wallet? Plug it into the phone with a USB-C cable, or show it to the camera. It signs, the phone sends by call, and your keys stay on the device. Your hardware wallet stays offline too. TELRPC never needs it connected to the internet.
Use your hardware walletLedger, Trezor, BitBox, Keystone, Foundation Passport and Blockstream Jade are trademarks of their respective owners. TELRPC is independent, and not affiliated with or endorsed by any of them.
Your balance is a phone call away.
One tap places a short call, the grid calls straight back, and your balance lands on screen without the phone ever ringing. Or scan it as a QR from any screen, or hear it spoken on any telephone.
A balance read by call uses 1 credit, 10 cents of prepaid credit; the balance page on this site is free. The call is ordinary airtime: a local call where a local number is live (15 countries today, 93 on request), or a call to the US line from anywhere.
More in the wallet
Ten cents a broadcast.
Paid from prepaid credit.
Top up first, by card or crypto. The 10 cents is shown before you dial and comes from your credit, never as a percentage of a send. Every fee is shown on the review before you swap.
10¢
Per broadcast, from prepaid credit, metered off the grid
10¢
Per sync, balance read, swap price check, swap, token approval or contract read by call, charged only when it succeeds
0¢
QR sync and the balance page on this site
Rather not use a phone? Build the Kit.
An offline wallet from named parts you can see and check: a Raspberry Pi 5, a touch display, a camera and a 4G voice stick.
$249a complete kit of sealed parts, unassembled, plus $25 shipping.
The key was born offline. It lives its whole life there.
The signed APK is available today.
Signed betaDownload APK
iOSComing soon