Picture this

Who it is for

Kola's bakery pays gas for every stamp and redemption. Customers sign in with a passkey and collect points without buying STRK.

Two ways to own it

What you get

Base$139

$35 deposit to reserve

Passkey account, sponsored gas, points contract, redemption.

You choose: perks
You choose: accent color

Customfrom $1,000

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

Paymaster docs list consumer uses; no shop loyalty product was found.

Closest things out there

AVNU paymaster; Starknet consumer apps.

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

Loyalty with zero crypto homework.

The Regatta Board

Races it can enter

grant · Starknet Foundation · rolling

Starknet Seed Grants / Propulsion

rolling

Official page ↗

Ecosystem program for shipped apps; check current terms.

Their rule on existing code: Existing projects OK

What you own

The whole app, not a starter kit.

The complete Paymaster Perks app: a shop loyalty card where customers stamp with a passkey on Starknet and the shop pays every gas fee, with plans, receipts and a perks agent built in.

Base price · $139

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: stamp with your face, the shop pays the gas, a full card gets a free loaf.

Card progress and next actionHome

Drawn stamp card, double stamp day badge and one clear next step.

Passkey stamping with till codeStamp

Scan the rotating till code, confirm with Face ID, gas sponsored by the shop's paymaster.

Daily cap and double stamp daysStamp

Per passkey daily limit, double stamps on the shop's chosen day, batched settling when fees spike.

Counter redemptionRewards

A full card becomes a counter code; stamps are burned onchain and the counter tablet shows the hand over.

Share card after a free loafRewards

A post ready card that names the shop.

Birthday loafRewards

A free loaf on the customer's birthday week. Gated behind Bread Club.

Menu and Friday pre-orderBakery

This week's bakes and a sourdough pre-order with time slots. Pre-order gated behind Bread Club.

Street cardBakery

One card that counts at neighbour shops. Gated behind Street Pass.

Onchain receiptsReceipts

Every stamp, redemption and plan payment with its hash, gas paid by the shop, and what never goes onchain.

Plans, passkeys and settingsMe

Pricing from the owner paywall with USDC checkout, backup passkey recovery and alert settings.

Open the full app demo

Add-on

Owner console

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

Counter tabletCounter

Rotating till code, hand over queue, gas jar and a stamp farmer test.

Revenue and paywall editorRevenue

MRR, incoming USDC payments, payouts, payment methods and live editing of tier names, prices and gates.

Rules and gas budgetRules

Stamps per reward, reward, monthly gas budget, daily cap, double stamp day, paymaster, till code and batching.

Perks agent log and roadmapAgent

What the agent did, including the scripted stamp attack and the fee spike, plus the priced Roadmap.

Top-up

Growth and referrals

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

Growth loops and cohortsGrowth

Friday note, bring a friend, share card, neighbour shop invites and cohort retention.

The money path, built in

How it earns for you

Stamps and rewards are free for customers and the shop pays the gas. Regulars pay a small monthly plan for extras, and neighbour shops pay to join the street card.

RegularFreeStamp card, sponsored gas, a free reward every card, receipts

Bread Club$3 a monthFriday sourdough pre-order, birthday loaf, double stamps on two days

Street Pass$6 a monthEverything in Bread Club, plus one card at 4 neighbour shops

Partner shops pay $15 a month to join the street card and fund their own gas jar. Gas runs about $0.004 per stamp on Starknet, paid from the shop's monthly budget.

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

Growth loops, built in

How it spreads

Double stamp day note the night before, sent from the Growth screen
Bring a friend: a friend's first stamp gives both a bonus stamp
Share card after every free loaf, naming the shop
Neighbour shop invites that turn one bakery into a street card

Roadmap · build the next phase with us

Where it goes next

v1 included

The full stamp card

Passkey accounts on Starknet
Points contract with daily cap and redemption
Paymaster with a monthly gas budget
Rotating till code and counter tablet
Plans, receipts and double stamp days

Included

Street card and split budgets

One card across a street of shops
Split gas budgets per shop
Partner shop onboarding by invite link
WhatsApp stamp alerts

Add-on from $500

Market network

One passkey account across every shop
Market association dashboard
Stall level budgets and payouts
Open loyalty schema for other apps

Add-on from $1,200

For investors and grant reviewers

The pitch, ready

An unfakeable shop loyalty card where the shop pays the gas and customers never see a token.

Problem: Paper stamp cards get lost, faked or washed. Onchain cards fix that, but asking customers to install a wallet and buy a token to collect a stamp kills the idea at the counter.

Solution: Customers sign with a passkey, stamps live in a Starknet points contract, and a paymaster charges every fee to the shop's capped monthly budget. A rotating till code and daily caps stop scripts.

Why now: Starknet accounts support passkey signers natively, paymasters such as AVNU are live, and gas is well under a cent per stamp.

Market: Bakeries, cafes, food stalls and market streets that run loyalty on paper today, starting in fast growing cities like Lagos.

The ask: Pilot shops on one street, and ecosystem grant support such as Starknet Seed Grants.

Funding is never guaranteed. Check each program's rules.

For hackathons and demo days

Your 2 minute demo

Home: meet Zainab, 20, five stamps on Kola's card in Yaba before lectures.
Stamp: scan the till code, confirm with Face ID, the paymaster pays the gas.
Owner Counter: the rotating till code, the gas jar, and fire the stamp farmer to see it refused.
Owner Agent: how the agent learned from 312 scripted stamps and a fee spike.
Stamp and Rewards: next morning is double Friday, the card fills, redeem the free loaf and share the card.
Owner Revenue: change the Bread Club price in the paywall editor and preview the customer Plans screen.
Owner Growth: send the Friday note and invite Tee's Suya to the street card.
Owner Roadmap: request the v2 street card build.

Many hackathons require code written at the event. See the Regatta Boardfor each race's rule.

Make it entirely yours

Custom work from $1,000: your own reward rules and branding, POS or WhatsApp integrations, extra languages, or a market association deployment. Scoped on a call.

Custom from $1,000

BLUEPRINT

Why it matters and how it really works

The need

Small shops want loyalty cards that cannot be faked or lost, but asking customers to install a wallet and buy a token to collect a stamp kills the idea at the counter.

What exists and what is new

Paymasters exist and are well documented: AVNU runs a paymaster on Starknet, and Starknet accounts support passkey signers natively. Starknet consumer apps already sponsor gas for their own users. Web2 loyalty apps also exist. What we did not find is a ready loyalty product for a single shop that bundles passkey sign in, shop sponsored gas, a points contract and counter redemption. This is a packaging of existing parts, not a new protocol.

The data it runs on

A points contract on Starknet holding stamp counts per customer account, sponsored transaction records, redemption events, the shop's gas budget and paymaster settings, and a rotating till code. Customer names and phone numbers stay in the shop's database, and passkey private keys never leave the customer's phone.

1.The mission

Give any neighbourhood shop an unfakeable loyalty card that customers use without learning anything about crypto.

2.Why people can't resist it

One tap, no wallet Customers sign with Face ID or a fingerprint. Nothing to install, nothing to buy.

Visible progress A card that fills up with drawn stamps and tells you how close the free loaf is.

Double stamp days The shop picks a day each week for double stamps, giving regulars a reason to come back.

Share the free loaf A redemption card customers can post, which brings friends to the shop.

3.How it works for real

Passkey account: A Starknet account contract with a WebAuthn passkey signer is created when the customer first scans the till code.

Till code: The counter tablet shows a code that rotates every 30 seconds; a stamp request must include a fresh code.

Paymaster: Stamp and redeem transactions are sponsored through a paymaster such as AVNU, paid from the shop's budget.

Points contract: A Cairo contract records stamps, enforces the daily cap and burns stamps on redemption.

Perks agent: Watches spend against budget, rate limits suspicious passkeys and batches stamps when fees spike.

Counter tablet: Shows redemptions to hand over and the gas jar for the month.

4.Cost per use and pricing

On Starknet a simple stamp is estimated at well under one US cent of gas; at about $0.004 to $0.006 per stamp, 2,000 stamps a month costs roughly $8 to $12. Hosting is about $8 a month. The real cost is the rewards themselves.

Corner shop $15 a month

One shop, one card, up to 3,000 sponsored stamps.

Street $39 a month

Up to 3 locations, double stamp days, perks agent alerts.

Market Custom

A shared card across many stalls in one market, with split budgets.

5.Growth loop

Every redemption produces a share card naming the shop. Neighbouring shops see the queue, and the owner can offer a shared card across a street or market.

6.Risks and guardrails

Sponsored spam: Anyone who can call the stamp endpoint can spend the shop's gas. Rotating till codes and per passkey caps limit this.

Fee spikes: Network fees move. Budgets are hard capped and the agent batches stamps instead of overspending.

Lost phones: A lost passkey loses access. Recovery uses a second passkey or the shop's help, and stamps carry over.

Paymaster dependency: If a paymaster service changes terms, the shop can switch provider; the points contract does not change.

7.Build order

Passkey account creation on Starknet
Points contract with daily cap and redemption
Paymaster sponsorship with a monthly budget
Rotating till code on a counter tablet
Customer card page and redemption screen
Perks agent alerts and double stamp days

8.Where this is going

Now
One shop, one stamp card, gas fully sponsored.
Next
Shared cards across a street of shops with split gas budgets.
Later
Customers carry one passkey account across every shop on the network.
Far
Neighbourhood markets run their own loyalty network with no card company in the middle.

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 Paymaster Perks

Paymaster Perks: A shop loyalty card where the shop pays every gas fee and customers never see a token. Using someone else's version means their rules, their brand and their revenue. Owning Paymaster Perks means it is deployed under your wallet, carries your name, and every customer, partner and result builds your track record instead of theirs.

What’s stopping you?

“I am not technical.”

Paymaster Perks arrives deployed with a guide. Running it is settings and sharing links, not code. If you get stuck, we help you ship it.

“What if nobody uses it?”

Start with ten people you already know. The first move below takes under an hour and tells you fast whether people care.

“I do not have time.”

Each step is sized in minutes. Most owners spend an hour a week, and the app does the repetitive part.

“Will it make me money?”

Nothing is guaranteed. The playbook gives you a clear path and honest numbers, and you decide how far to take it.

The million-dollar ladder

Charge the people who get the most value from Paymaster Perks: a monthly plan for groups or teams, plus setup fees for anyone who wants it done for them.

$100

$1,450

$11,700

$78,000

First harbour

5 customers

$20 a month

Steady trade

50 customers

$29 a month

Known name

300 customers