Powered by Starknet · Zero-knowledge privacy

Split bills in Bitcoin.
Privately.

No wallets. No gas fees. No one can see who owes what. Unclaimed funds earn yield while they wait.

See how it works
Dinner split
$47.50
4 people
🔒 Private
Hotel booking
$120.00
6 people
✓ Claimed
Festival tickets
$85.00
3 people
⚡ Earning yield
$0.00
Transaction fees
~4.5% APR
Avg yield earned
< 30 sec
Setup time

Why ZapSplit

The old way is broken.

Splitting bills shouldn't cost money, take days, or expose your finances.

Venmo / PayPal / Cash App
⚡ ZapSplit
Transaction fees
$3–10 per split
$0.00 — always
Settlement time
1–3 business days
~30 seconds
Payment privacy
Fully public on-chain
ZK-encrypted on Starknet
Yield on funds
0% — money sits idle
4–6% APR while unclaimed
Wallet required
Yes — seed phrases, installs
No — email login only
Who can see amounts
Anyone with a block explorer
Only sender + recipient
Gas cost
Paid by user in ETH
Sponsored by AVNU paymaster

How it works

Dinner to done in four steps

Sign in with email

No wallet download. No seed phrase. Just your email or Google account — Starknet account created automatically.

Add an expense

Name it, set the amount, choose who owes what. Equal split or custom — your call.

Send private payment links

Each person gets a unique link. Payments are ZK-private on-chain — no one can trace who paid whom.

Funds earn yield while waiting

Unclaimed STRK auto-stakes at 4–6% APR. The longer your friend delays, the more you earn.

Zero-knowledge privacy

Your finances are yours.

Every payment on ZapSplit uses STRK20 confidential transfers and Tongo ZK proofs. On-chain observers see a transfer happened — but not who sent it, who received it, or how much.

Amounts are hidden from the public ledger
ZK proofs guarantee correctness without revealing data
Only you and your counterparty can decrypt the note
✗ Without ZapSplit
From: 0xAlice → 0xBob
Amount: 47.50 USDC ← visible
Memo: "dinner split" ← visible
Block: #1234567 · Timestamp: 19:42
✓ With ZapSplit
Tongo transfer: note_0x8f2a...
Amount: [encrypted] ← private
Recipient: [encrypted] ← private
ZK proof: valid ✓

Under the hood

Best-in-class infrastructure

ZapSplit is built on production-grade Starknet primitives — not wrappers or hacks.

Privy
Auth & Embedded Wallets
Identity

Email, Google, and Apple login. No wallet download ever. Every user gets a Starknet account auto-created in the background.

Starkzap SDK
Core Web3 Layer
Core

The official Starknet developer SDK. Orchestrates wallets, paymaster, confidential transfers, and staking in one TypeScript package.

AVNU Paymaster
Gasless Transactions
UX

AVNU sponsors every on-chain transaction. Users never need STRK to pay gas — the entire UX is gasless by default.

Tongo / STRK20
ZK-Private Transfers
Privacy

Confidential token transfers using zero-knowledge proofs. On-chain observers see that a transfer happened — but not the amount, sender, or recipient.

Starknet Staking
Yield on Unclaimed Funds
Yield

Funds held in escrow are auto-staked via Starknet's native delegation pools. Recipients earn APR while they delay claiming.

Cairo / Starknet
ZK Rollup Infrastructure
L2

Every ZapSplit transaction settles on Starknet — a ZK rollup with ~$0.001 tx fees, native account abstraction, and Ethereum-grade security.

FAQ

Questions, answered.

No. Recipients just open a link and sign in with their email or Google account. Their Starknet wallet is created automatically in the background — they never see a seed phrase, never install MetaMask, never need ETH for gas.
Free during beta

Ready to split smarter?

No wallet. No gas. No one sees your finances. Your friends can claim in 10 seconds with just an email.

Testnet beta · Powered by Starknet · No credit card required