Tripled conversion. $135M a year added.
Confirmo moves three quarters of a billion dollars a year through a checkout with a 9% success rate, running on a backend that couldn’t be touched. And without touching it, I tuned the flow into an extra $135M yearly.
43%success, key markets
3xfrom 9 to 27%
$135Madded yearly
0backend changes
Product Design Lead, the company’s first designer. The full product surface, buyer and merchant, plus brand and website. I built the component library and design system from scratch, and moved design to the front of product with the CPO. 2025/2026, Prague, remote.
context
A checkout built for the backend, not the buyer.
- Volume grew from $63M to $750M a year in three years, ~60% of prop trading payments worldwide.
- One flow carried all of it, reverse-engineered from the crypto invoice spec.
- Hard backend dependencies made the flow itself untouchable.
PAYMENT · v2.4blocks: 4
total.crypto
precision: 8dp
PAYMENT · v11.1blocks: 14
warn.banner
tooltip.hint
total.fiat
precision: 6dp
fiat.ref: EUR
xr.rate
window: 15 min
qr.render(addr)
addr.copy
wrap: 2 lines
btn.payWallet
fallback: manual
PAYMENT · v21.8blocks: 26
warn.banner
match(asset,net)
tooltip.expand
asset: USDC (ERC-20)
network: Ethereum
contract: 0xa0b8…6eb48
recovery.fee
no.guarantee
total.fiat
precision: 6dp
fiat.ref: EUR
xr.table
rate.locked
product.price
network.fees
qr.render(addr)
format: EIP-681
addr.copy
checksum: EIP-55
wrap: 2 lines
btn.payWallet
deeplink: wc://
fallback: manual
timer.expire
on.zero: invoice.void
footer.locale
discovery
Analytics couldn’t see the leak. I mapped it by hand.
- $680M a year failed to convert across only three steps, too few for analytics to isolate causes.
- I mapped every screen, ran workshops with Sales, Engineering and Product, and reviewed Customer Support complaints.
- The loudest complaint became the starting point: the back button didn’t work.
priorities
01Back button(impossible tho)
02Users sending wrong funds
03Users sending wrong amount
04Multi-method payments
05No feedback on fail
06Can’t connect wallet
root cause
Two taps, one irreversible invoice: you’re out.
- Tap one selects a token; tap two selects a network, locks the rate, and creates the invoice.
- Invoices cannot be deleted or reversed, by design: a payment landing on a dead invoice is lost.
- Users trying to preview their total were pushed to a new screen with no way back. The trigger was the problem, not navigation.
Payment ID
inviwBEdCBwRxFX
12.01 EUR
Pay with
Search for a cryptocurrency...
USD Coin
11.285432 USDC
Select →
Tether USD
11.285143 USDT
USDG
11.279854 USDG
Bitcoin
0.00017606 BTC
Ether
0.00402551 ETH
Back to Merchant
Invoice expires in 08m 24s
English
Payment ID
inviwBEdCBwRxFX
Select network to send
USD Coin (USDC)
USD Coin (USDC)
Ethereum
Processing fee 0.000876 USDC
Solana
Processing fee 0.000791 USDC
Arbitrum
Processing fee 0.000834 USDC
Polygon
Processing fee 0.000811 USDC
Optimism
Processing fee 0.000859 USDC
The amount in crypto may differ slightly after you have made your choice.
Back to Merchant
Invoice expires in 08m 24s
English
Payment ID
inviwBEdCBwRxFX
Send USDC on the Ethereum blockchain, otherwise your funds will be lost. ?
Total to pay
11.284667 USDC
Ethereum address:
0x52DF1440197F618Bc704814
1e32D8150E641cf7b
Invoice expires in 08m 24s
English
The obvious fix was to change the trigger: create the invoice once the user commits. But the invoice is load-bearing. Three quarters of a billion dollars a year ran through it. Its guarantees keep an irreversible payment from missing its target. Rebuilding it mid-flight was a risk nobody would take. The backend was off-limits. Whatever I found had to live in the frontend.
iteration
At a 9% baseline, shipping fast was nearly free.
- Every surface pain point became a shipped iteration, evaluated on live signal.
- The biggest bet failed: breadcrumb navigation taught users they could go back while the mechanics still forbade it.
- Users ended up stuck again, now with added frustration.
Payment ID
inviwBEdCBwRxFX
Send USDC on the Ethereum blockchain, otherwise your funds will be lost. ?
Total to pay
11.284667 USDC
Ethereum address:
0x52DF1440197F618Bc704814
1e32D8150E641cf7b
Connected wallet: 0xCCe9...C8C47
Invoice expires in 08m 24s
English
QR code|Pay from Wallet|Manual
To avoid losing funds ensure you send USDC on the Ethereum Network.
Pay with Trust Wallet
Connected wallet: 0xCCe93...C8C47
1
2
3
10
guaranteed rate
guaranteed rate
USD Coin
11.284667USDC
Total
12.06EUR
solution
Taps saved in the frontend, the invoice delayed until commit.
- Taps now save the selection locally; users preview any token-network pairing without triggering the backend.
- A new button holds that state and moves the flow forward only when tapped.
- On commit, the saved selection is sent wrapped as the original trigger.
ASLEEPnothing chosen yet
select token
WAKINGtoken picked, network pending
11.284667 USDC
select network
LIVEready, waiting on user
11.284667 USDC
on Ethereum network
(ERC20)
craft
One button anchors all three steps.
- Step one: it stores the selection and advances the flow when the user is ready.
- Step two: it carries the money: fiat price, exchange, conversion, and total to pay.
- Step three: it stays on screen as a reference while the payment completes.
Return
En
Select token
Payment selection requires two steps. A crypto token and a network to carry it. You must send the token on the network you select.
TokenNetwork
Popular 
USDC
6 networks
USDT
7 networks
USDG
2 networks
Bitcoin
2 networks
Ethereum
1 networks
Purchase price12.01 EUR
select token
ReturnEnSelect network
Payment selection requires two steps. A crypto token and a network to carry it. You must send the token on the network you select.
TokenNetwork
Ethereum
Processing fee 0.000876 USDC
Solana
Processing fee 0.000791 USDC
Arbitrum
Processing fee 0.000834 USDC
Polygon
Processing fee 0.000811 USDC
Optimism
Processing fee 0.000859 USDC
Purchase price12.01 EUR
11.284667 USDC
select network
ReturnEnSelect network
Payment selection requires two steps. A crypto token and a network to carry it. You must send the token on the network you select.
TokenNetwork
Ethereum
Processing fee 0.000876 USDC
Solana
Processing fee 0.000791 USDC
Arbitrum
Processing fee 0.000834 USDC
Polygon
Processing fee 0.000811 USDC
Optimism
Processing fee 0.000859 USDC
Purchase price12.01 EUR
11.284667 USDC
on Ethereum network
(ERC20)
ExitEnPayment
Select USDC on the Ethereum network when making the payment. Funds sent on a different network will be lost.
Wallet ConnectManual Payment
Pay with Trust WalletConnected wallet: 0xCCe9...C8C47 
Purchase price12.01 EUR
Processing fees00.000876 USDC
Exchange rate1 EUR ~ 1.000401 USDC
Total to pay(12.06 EUR) 11.284667 USDC
11.284667 USDC
on Ethereum network
(ERC20)
Waiting payment 08:24
Exit
EnYou can close this window now.
Paid!
Your payment has reached the merchant.
Thank you for using Confirmo.
Thank you for using Confirmo.
11.284667 USDC
on Ethereum network
(ERC20)
Payment history
12:46:43
03 Jan 26
12:46:43
Verification complete100%
12:46:43
Processing complete100%
12:46:43
Payment received+11.284667 USDC
12:46:43
Payment rate1 EUR ~ 1.000401 USDT
02 Jan 26
Rate your experience
impact
3x success, $135M a year, zero backend changes.
- Success rose from 9% to 27% overall, 43% in key markets, above the crypto average of 24%.
- Converted payments rose from ~$67M to $202M a year: $135M added.
- The result funded the follow-up: the world’s first crypto subscription service, designed with AI from day one.
Cesar Garcia · Product Design Lead · Confirmo