PAYMENTS & FINTECH

Find the exploit before it reaches the ledger.

Money is the direct target. Feint attacks balances, webhooks and KYC like a motivated attacker, then hands you the fix.

PAYMENTS & FINTECH

Find the exploit before it reaches the ledger.

Money is the direct target. Feint attacks balances, webhooks and KYC like a motivated attacker, then hands you the fix.

PAYMENTS & FINTECH

Find the exploit before it reaches the ledger.

Money is the direct target. Feint attacks balances, webhooks and KYC like a motivated attacker, then hands you the fix.

What

Feint

attacks first.

Feint starts where a real attacker would start in your stack, then chains what it finds.

01

IDOR on ledgers

Reads and moves balances across accounts by swapping the ids Feint found while mapping your API.

02

Balance race conditions

Fires parallel requests at withdrawals and transfers to catch a double-spend inside the timing window.

03

KYC bypass

Walks verification flows out of order to reach limits that should need an approved identity.

04

Signed webhook replay

Replays and reorders provider webhooks to credit the same payment twice.

One real chain

Four small steps. One real exploit.

Feint only reports what it can prove. Every finding comes with the request log, the pull request and a regression test.

01

Parallel withdrawals sent

02

Limit check passes twice

03

Debit lands too late

04

Wallet drained past its limit

GET STARTED

Run your first attack on your own code.

Point Feint at staging. Within the hour you’ll have a proven finding, or a clean report you can show your auditor.

No credit card · First exploit within the hour

GET STARTED

Run your first attack on your own code.

Point Feint at staging. Within the hour you’ll have a proven finding, or a clean report you can show your auditor.

No credit card · First exploit within the hour

GET STARTED

Run your first attack on your own code.

Point Feint at staging. Within the hour you’ll have a proven finding, or a clean report you can show your auditor.

No credit card · First exploit within the hour

© 2026 Feint, Inc.

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