Picture this

Who it is for

A housing coop in Lisbon takes encrypted offers for a flat; the winning offer is revealed only to the coop.

Two ways to own it

What you get

Base$169

$42 deposit to reserve

Listing, encrypted offers, reveal to owner.

You choose: accent color

Customfrom $1,300

Built around you

Reshape it entirely: new features, your flows, your brand end to end, integrations you need. We scope it with you.

Everything in Base
Custom features and design
Priority build

Why it is new

What exists today, and what this does differently

What is new

Sealed bid demos exist on FHE chains; a rent offer product was not found.

Closest things out there

Generic sealed bid auctions.

Checked with web searches in October 2026. A search is not proof that nothing similar exists, and the market moves fast, so we recheck before every build.

What it unlocks

The human in it

Fair offers, no bidding wars in the open.

The Regatta Board

Races it can enter

buildathon · Fhenix · upcoming

Fhenix buildathon / grants

unknown

Official page ↗

Ecosystem program for shipped apps; check current terms.

Their rule on existing code: unknown

What you own

The whole app, not a starter kit.

The complete Sealed Rent app: landlords and housing coops take sealed, encrypted rent offers on Fhenix, compare them without decrypting, and reveal only the winner to the coop, with a paywall, owner console and intake agent built in.

Base price · $169

The user app, complete

Every buyer gets the same finished app. Basic branding and copy changes come through a quick form.

Three step onboardingHome

Shown once: open offers start bidding wars, one sealed offer each, only the winner comes out.

Listing progress and next actionHome

Listed, offers in, revealed and Thursday, with floor, sealed offers and amounts seen.

Listing rulesListing

Floor rent, winning rule and counts only setting, locked into the listing contract before the first offer.

Lottery and member votesListing

A lottery among offers above the floor and member voting on rules. Gated behind Coop.

Sealed offers from the phoneOffers

Each applicant's offer is encrypted on device; open bidding and a snooping bot shown for contrast.

Intake agentOffers

Answers applicant questions and sends reminders, with no decrypt permission. Gated behind Coop.

Close and revealReveal

At close only the winning offer is decrypted for the coop; others hear not selected; receipt shows what is onchain.

Thursday digestThursday

New flats for applicants and how past flats settled, with a save and streak.

Plans and settingsMe

Per listing or monthly pricing from the owner paywall with crypto checkout, gas sponsoring and unlimited listings gate.

Open the full app demo

Add-on

Owner console

Your admin side: revenue, paywall editor, users, rules and the agent log.

Revenue and paywall editorRevenue

Revenue from listings and coops, payouts, incoming USDC, payment methods and live editing of tier names, prices and gates.

Coop approvalsCoops

Approve coops and landlords, decline agencies that want losing offers.

Rules, agent log and roadmapRules

Close time, reminders, sponsored offers, one offer per applicant and counts only; plus the Agent log and priced Roadmap.

Top-up

Growth and referrals

Referral and growth mechanics, switched on when you are ready to grow.

Coop open evenings and referralsGrowth

Run an open evening with a coop federation, see loops and simulate referrals.

The money path, built in

How it earns for you

Applicants never pay. Landlords pay a fee per listing, and coops pay monthly for unlimited listings, the lottery rule, member votes and the intake agent.

ApplicantFreeMake sealed offers and get the Thursday digest

Landlord$15 per listingOne listing contract, sponsored gas for up to 30 offers, winner reveal

Coop$39 a monthUnlimited listings, lottery rule, member voting on rules, and the intake agent

Rent never passes through the app. FHE gas for offers is typically cents and can be sponsored by the landlord.

Prices are yours to set. Illustrative, not a promise of income.

Growth loops, built in

How it spreads

Listing links shared in neighbourhood groups and housing forums
The Thursday digest that brings applicants back
Coops telling coops about a fair rule
Coop open evenings with federations
Coop referrals worth a free month

Roadmap · build the next phase with us

Where it goes next

v1 included

The full sealed letting app

Listing contracts with floor and rule
Encrypted offers from the phone
Encrypted compare and winner reveal
Thursday digest for applicants
Paywall, owner console, intake agent

Included

Verified applicants and deposits

Applicant verification without sharing documents
Deposit held in escrow
Lease signing handoff
Waitlists for coops

Add-on from $500

City housing programmes

Municipal affordable housing lotteries
Priority groups in the lottery
Public audit of draws
Multi language intake

Add-on from $1,200

The pitch, ready for investors and grant reviewers

Unlocked when your app is paid in full

Your 2 minute demo script

Unlocked when your app is paid in full

Make it entirely yours

Custom work from $1,300: coop branding, a municipal lottery setup, lease integrations or extra languages. Scoped on a call.

Custom from $1,300

BLUEPRINT

Why it matters and how it really works

The recipe (how it is built, the data, costs, risks, build order, the pitch and the demo script) is unlocked when your app is paid in full.

The need

When a good flat comes up, landlords and housing coops get flooded with offers in public chats and portals. Applicants see each other's numbers and bid each other up, people who cannot keep raising drop out, and everyone's offer stays visible forever. Small landlords and coops want fair offers without running an auction in the open.

What exists and what is new

Sealed bid auctions are a known pattern, and sealed bid demos already exist on FHE chains, including Fhenix examples. Our search did not find a product built for rent offers. What is new is the rental product around the mechanic: a floor rent, a choice between highest offer and a lottery at the floor, an optional encrypted count of offers above the floor, and a reveal of only the winner, only to the landlord. The cryptography is not new; the use and the fairness options are.

The data it runs on

Unlocked when your app is paid in full

1.The mission

Let people offer what they can honestly pay for a home, without being pushed into a bidding war or exposing their number to anyone.

2.Why people can't resist it

No public war Applicants offer once and walk away. No refreshing a group chat to see if someone outbid them.

A fair rule Coops can choose a lottery at the floor rent, so the person with the most money does not always win.

Thursday flats A weekly digest of new coop and small landlord listings, each one offer away.

3.How it works for real

Unlocked when your app is paid in full

4.Pricing

Cost per use: unlocked when your app is paid in full.

Applicant Free

Make sealed offers and get the Thursday digest.

Landlord $15 per listing

One listing contract, sponsored gas for up to 30 offers, winner reveal.

Coop $39 a month

Unlimited listings, lottery rule, member voting on rules, and the intake agent.

5.Growth loop

Every listing link is shared in neighbourhood groups and housing forums. Applicants who lose still keep the digest and come back on Thursdays. Coops talk to other coops, and a fair rule is a story people repeat.

6.Risks and guardrails

Unlocked when your app is paid in full

7.Build order

Unlocked when your app is paid in full

8.Where this is going

Now
Sealed rent offers for a single listing, with highest or lottery rules, on Fhenix.
Next
Coop member voting on rules, waiting list priority, and sponsored gas by default.
Later
Sealed offers for shop leases, allotments and student rooms, anywhere a scarce space draws a crowd.
The world it builds
Homes go to people through fair rules they can see, not through who shouts the biggest number in public.

Costs and tools are estimates at the time of writing. General information only, not legal or financial advice.

OWNER PLAYBOOK

Own it, then chart your voyage

Nine routes from one vessel. Tap a port to open its chart.

Why own Sealed Rent

Sealed Rent: Landlords take sealed encrypted rent offers, and nobody sees the others. Using someone else's version means their rules, their brand and their revenue. Owning Sealed Rent means it is deployed under your wallet, carries your name, and every customer, partner and result builds your track record instead of theirs.