Growthitt / Case Studies / Trade X · Referral
Case Study · Referral Growth

How we built a referral programme from zero that drove 30% of all new users at a YC-backed startup — in under 3 months.

Trade X had a problem most growth teams never solve cleanly: banned from the Google Play Store, with a ₹25 CAC ceiling that made pure ad scaling impossible. This is the full story of how we designed a referral engine that eventually started generating its own referrals.

Company
Trade X · YC W21
Category
Real Money Gaming
Raised
$5M
Timeline
0 → 30% UA in < 3 months
Role
Founding team · Growth Lead
30%
of all new user acquisitions at peak
Built from zero
+30%
New-user activation rate uplift
Referred users deposited faster
4M+
Total signups scaled at Trade X
Referral sustained core channel
₹0
Engineering cost to kill fraud
Solved by mechanic design
2nd
Order referrals achieved
Programme self-generated
01 — Context

Trade X was category-defining.
And completely stuck on distribution.

Trade X was building something genuinely new in India: an opinion trading platform where users could participate in events — sports, politics, entertainment — and win or lose based on outcomes. The product was engaging. Users who understood the game came back daily.

The problem was getting them there. Trade X had been banned from the Google Play Store, eliminating the primary install channel for any Indian consumer app. Every user had to be acquired through paid ads, creator content, or direct APK file distribution.

Paid acquisition was working but had a hard ceiling: sub-₹25 per sign-up, sustained. As spend scaled, costs were rising, not falling. The team needed a new acquisition lever that didn’t depend on ad auctions.

02 — The Problem

Build a referral programme that scales — without leaking money or enabling fraud.

Real Money Gaming referral programmes have a specific failure mode: the incentive to abuse them is extremely high. Users on gaming platforms think about expected value. A reward claimable without genuine intent will be exploited — fake accounts, self-referrals, device farms. We had seen this kill competitor programmes.

The additional constraint: Trade X couldn’t afford a cost-centre referral programme. Rewards needed to be economically self-sustaining — funded by the activity the referrals generated, not by a fixed budget.

The Hard Constraint

Any mechanic rewarding users before they generated platform revenue would be abused or become unprofitable. The design had to solve acquisition, activation, and fraud prevention simultaneously — with one mechanic.

03 — What Failed First

Three mechanics we tested before finding the one that worked.

Each failure taught us something specific about where the design was breaking down.

MechanicWhat HappenedWhy It FailedVerdict
Reward on signup only
In-app currency on sign-up, no deposit required
High referral volume. Numbers looked good immediately. Almost none of the referred users deposited or traded. We were paying for empty accounts. ✗ High volume, zero quality
Two-sided cash reward
Withdrawable cash for both referrer and referee
Fraud appeared within days. Device farms, fake accounts, self-referral rings. Withdrawable cash on a gaming platform is an open invitation. Bad actors found the path immediately. ✗ Fraud risk unacceptable
Reward too small
Low-value reward to minimise cost
Near-zero sharing behaviour from existing users. Below the psychological threshold where sharing feels worth the social effort. People don’t refer friends for trivial amounts. ✗ Insufficient motivation
What the Failures Showed

The mechanic needed to be meaningful enough to motivate sharing, impossible to abuse without real intent, and self-funded by the activity it generated. No off-the-shelf template solved all three. We had to design it from scratch.

04 — The Winning Mechanic

A reward structure that solved acquisition, activation, and fraud simultaneously.

The winning mechanic came from a reframe: instead of "how do we reward referrals?", we asked "what does the referred user need to do to become real — and can the reward make that happen automatically?"

For the Referred User
₹20

Non-withdrawable in-app credit

Credited on sign-up but non-withdrawable and only usable in a trade event. To use it, the new user had to add real money and make their first trade. The reward forced the activation step.

↑ Turned a passive sign-up into a first deposit
For the Referrer
10% of 2%

Ongoing revenue share on platform fee

The referrer earned 10% of the 2% platform fee on every trade by users they referred — ongoing, not one-time. The more their referrals traded, the more they earned.

↑ Incentivised quality referrals, not just sign-ups
Why This Was Different

The ₹20 non-withdrawable credit wasn’t a reward in the traditional sense — it was an onboarding mechanism disguised as a reward. The referred user didn’t feel pushed to deposit — they felt like they were using free money. Completely different psychological framing from a forced deposit requirement.

The referrer revenue share meant referrers had a financial reason to refer active traders, not just anyone. Quality was self-selected at the source.

05 — Fraud by Design

We didn’t build fraud detection.
We made fraud pointless.

To abuse the programme, a bad actor needed to create a fake account, add real money to the wallet, and make at least one trade. At that point, they had become a real user. The “fraud” converted into exactly the outcome we wanted.

No arbitrage existed. The cost of abuse was identical to the cost of genuine participation. Zero engineering resources spent on fraud detection.

Result

Fraud dropped to near-zero without any detection infrastructure. What looked like a fraud problem was an incentive design problem. Solve the design, the fraud disappears.

06 — Distribution Strategy

The right mechanic with no distribution
is still zero.

A referral programme needs critical mass to become self-sustaining. We seeded it across two parallel channels.

Creator network

Trade X had already built a network of 800+ YouTube and Telegram creators across gaming, finance, and sports. Their compensation was performance-based (Cost per Deposit, Revenue Share, or Cost per Sign-up). We briefed them differently depending on their audience — no single script:

Testimonial Style
"I use Trade X, here’s what I’ve won" — authentic experience with referral code shown naturally.
High conversion
Reward-Led Hook
Led with the ₹20 free credit as the hook. Worked best with cost-sensitive audiences.
High volume
Gameplay Demo
Screen-recorded gameplay with referral code at the end. Reduced knowledge barrier for new users.
High quality
Pure CTA
"Use my code, get ₹20 free." Short-form for Telegram channels and Stories.
Medium volume

In-app triggers

Post-win: Surfaced the referral prompt immediately after a payout — the highest-motivation sharing moment. Post-deposit: Explained the programme to new users who had just added money, framed as "earn while you play." A weekly leaderboard added social status incentive alongside the financial one.

07 — The Flywheel Moment

The moment we knew it worked: the programme started generating its own referrals.

Most referral programmes plateau at a steady state. The Trade X programme crossed into second-order referrals: users who had been referred were themselves becoming referrers — generating further referrals with no prompt from us. The incentive structure was self-replicating.

The Self-Sustaining Referral Loop
1
Creator or existing user shares referral code

Motivated by 10% revenue share on all future trades by referred users

2
New user signs up, receives ₹20 non-withdrawable credit

Credit only usable in a trade event — activation forced by design

3
New user adds real money and makes first trade

Fraud eliminated here — real money required before any reward realised

4
New user becomes an active trader

Referrer earns ongoing revenue share; referred user understands the platform

5
Active trader becomes a referrer themselves

Same revenue share incentive kicks in — second-order referrals begin, programme sustains itself

08 — Full Results

What the programme
actually produced.

Peak Referral UA Share
30%
Of all new user acquisitions across every channel at peak.
Activation Rate Uplift
+30%
Overall new-user activation as referral grew as a share of total acquisitions.
Time to 30% UA
3mo
From nothing built to 30% of all new user acquisitions.
Total Scale Achieved
4M+
Total sign-ups at Trade X. Referral remained a core channel throughout.

The programme was economically self-funded — referrer rewards paid from revenue generated by referred users. Trade X went on to 4M+ sign-ups and 700K+ paid users, establishing itself as the category leader in opinion trading in India. Growth metrics contributed directly to the $5M fundraise.

09 — What We Learned

Three principles this case study
proves about referral design.

Lesson 01

The reward mechanic is an onboarding tool, not just an acquisition tool

The ₹20 credit worked because it forced the exact behaviour that makes a new user real: the first trade. The best mechanics make the activation step part of the reward experience itself — the new user isn’t completing onboarding to get a reward; they feel like they’re using a reward while completing onboarding.

Lesson 02

Fraud is an incentive design problem, not an engineering problem

The instinct when fraud appears is to build detection. The better solution is to make fraud structurally uneconomic. If the reward can only be realised by doing what a real user would do anyway, there is no exploit to find.

Lesson 03

Second-order referrals make a programme fundamentally different

Most referral programmes are linear — you put fuel in, users come out. A programme with second-order referrals compounds. The difference: whether referred users have the same incentive to refer as the original referrers did. If yes, the loop closes and the programme sustains without constant fuel.

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