Henad

Send dollars, they arrive as pounds — onchain FX on Monad, with a public receipt showing the rate you got and the spread in bps.

Remittance pricing hides its real cost inside the exchange rate. The advertised "zero fee" is paid in the spread, and nobody can audit it because the quote and the fill are both private. On Monad both can be public and provable. The payment is the product; the receipt is the proof.

Web app	https://usehenad.xyz
Android app	download the APK · release notes — no store account needed
A real receipt	0.40 AUSD → £0.298070 at 19 bps
Network	Monad mainnet, chain 143. Live since 18 Sep 2026

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How a payout works

1. You hold AUSD or USDC. No fiat leg, no float, no KYC; /top-up swaps MON for either if your account only has gas.
2. You sign one ERC-3009 authorisation with your passkey. Henad's relayer submits it, so you never need MON to pay for a payout.
3. CorridorRouter settles it in a single transaction: it pulls the dollars, swaps them at Mento's onchain FX venue into the recipient's currency, and delivers them. Either the whole thing completes at a rate you agreed to, or it reverts and you still have your money. A minimum-out floor is enforced onchain, not in the UI.
4. RateAttestation writes the receipt, onchain, in the same transaction: the Chainlink reference rate at that moment, the rate actually executed, and the gap between them in basis points.

Anyone can read that spread without trusting us. It is the number every remittance service declines to print.

Corridors live today: AUSD → GBPm, EURm, CHFm, JPYm, and USDC → GBPm. They settle only while the FX market is open — Mento's market-hours breaker halts quoting from 21:00 UTC Friday to 23:00 UTC Sunday, and the apps say so rather than failing mysteriously.

Accounts are passkeys. Face ID or a fingerprint, no seed phrase, no password, and the same passkey opens the same account on the web and on Android.

On Monad mainnet

All four contracts are verified on Monadscan, deployed at block 105,928,848. They have no proxy and no upgrade path, which is a deliberate trade: what you read is what runs, and it cannot be swapped underneath you.

Contract	Address
CorridorRouter	0x994e95FDb1713b1b12d3ccE47e2BC2145F43a0c9
RateAttestation	0xCA9536F48Ac5C1673c7D7B20D4E76056Fc4fE3B1
ChainlinkRateSource	0x0b7CB973f3ceBbdd8983973727dcB381dD184228
MentoVenueAdapter	0xdf80efdAb089F33157845B653A44388640838360

The owner key can register a corridor and repoint an existing one at a different venue or rate source. It cannot touch anyone's funds, pause a payout, or alter a receipt that has been written. https://usehenad.xyz/docs/contracts states those powers exhaustively.

What Henad deliberately does not do

• No fiat. We never take naira or dollars, never hold a float, never do KYC. Nigeria's SEC licenses virtual-asset service providers under the Investments and Securities Act 2025. Henad is software that routes between existing licensed on- and off-ramps; it is not one of them.
• No custody. Funds move from the payer's wallet to the recipient's wallet in one transaction. Nobody here can freeze, reverse or recover a payout.
• No own liquidity and no invented rate. The reference comes from Chainlink, the fill from Mento.
• No fee. There is no fee parameter in the contracts to switch on later. Charging before anyone wants the product would be pricing a thing nobody uses; if that changes it will be a new contract and a public one, not a flag flipped overnight.
• No wallet, no token, no points.

Layout

contracts/      Foundry. CorridorRouter, RateAttestation, PayoutIntent, Chainlink + Mento adapters.
packages/core/  Shared TypeScript: chain config, addresses, ABIs, corridor maths, intent signing.
web/            Next.js App Router. /send, /rates, /receipts, /receipt/[intentId], /top-up, /docs.
mobile/         Expo app on the same core: send, top up, rates, receipts, account, settings.
scripts/        local-fork.sh and the operational odds and ends.
docs/           How it was built and what is actually verified on chain.
design/         Brand and UI source.

Running it

pnpm install
cp .env.example .env     # MONAD_MAINNET_RPC_URL is the only one needed to read the chain
pnpm dev:web             # http://localhost:3000

Tests, the phone app, and a local mainnet fork that lets you spend fake money against the real pools: see CONTRIBUTING.md.

pnpm test                # TypeScript
cd contracts && forge test                              # unit
cd contracts && forge test --match-path 'test/fork/*'   # against live Mento and Chainlink

Releasing the Android app

The APK is built by GitHub Actions rather than on a laptop, and the workflow publishes the release itself:

gh workflow run android-dev-build.yml --ref main -f profile=community -f release_tag=v0.1.2

It refuses to publish if the signing certificate differs from the one already shipped, because a new certificate would force everyone to uninstall and lose the app-bound half of their setup.

Documentation

docs/PROBLEM.md	Why this exists, and who it is for
docs/INTEGRATION-FACTS.md	Every external address and claim, with how it was verified
docs/CONTRACTS-SPEC.md	The contracts, their invariants and their failure modes
docs/UPGRADEABILITY.md	Why there is no proxy, and what the escape hatch is instead
docs/ONRAMP.md	How money actually gets onto Monad, routes measured on chain
docs/NAIRA.md	Why there is no naira corridor yet
docs/DEPLOY.md	The site, the domain, and the deploy path
docs/TESTING-MOBILE.md	Android builds, passkeys and Digital Asset Links

The name

Henad is from the Greek ἑνάς (henas), "a unit of one," from ἕν (hen), "one." The Neoplatonists, Proclus in particular, used henads for the individual units of unity that proceed from the One.

It is the sibling word to monad, μονάς (monas), "unit," from μόνος (monos), "one, single, alone." The Pythagoreans used monas for the first number of a series, the one from which all others derive; Leibniz took it for his simple, indivisible substances in the Monadology (1714). Same root family, same tradition, different prefix: mono- is single, hen- is unified.

A monad is the indivisible unit. A henad is the unit that makes separate things one. That is what this product does: two currencies, one settlement, one receipt.

Pronounced HEE-nad. Henad in prose and UI, henad in code.

Status and licence

Built for Monad Metropolis, 1 Sep – 13 Oct 2026, by one person. Live on mainnet and unaudited: read SECURITY.md before you trust it with an amount you would miss.

MIT — see LICENSE. Built by Divinity Labs.