Secure Your FinTech Platform
Your FinTech platform manages real money, bank account links, and sensitive financial transactions. Zero Day helps you make sure ledgers stay untampered, APIs meet financial-grade standards, and fraud is stopped cold.
What We Help You Secure
We focus on ledger transactions, open banking API integrations, and KYC vaults.
Transaction & Ledger Pipeline
HMAC signatures, idempotent transaction IDs, and atomic state machine checks.
Open Banking & FAPI Endpoints
Mutual TLS (mTLS), sender-constrained tokens, and financial-grade API authorization.
KYC & PII Vaulting
Envelope encryption for Social Security numbers, driver licenses, and bank account numbers.
Anti-Fraud & Anomaly Scoring
Real-time detection of high-risk transfers, velocity abuse, and suspicious IPs.
Webhooks & Partner APIs
Verify signatures and prevent replay attacks on incoming banking webhooks.
Admin Money Controls
Multi-party approval workflows for high-value manual transfers or reversals.
Why Security Matters for Your Business
Security isn’t just technical — it protects your capital, license, and user funds.
Financial Capital Protection
Transaction tampering or double-spending directly depletes your platform reserves.
Banking Partner Compliance
Sponsor banks and card networks mandate rigorous security reviews before issuing BINs or API access.
User Account Integrity
Account takeover and unauthorized money transfers destroy customer trust instantly.
How We Work With You
A clear, founder-friendly process from first conversation through launch.
01.Understand Product
We review your ledger logic, banking partner APIs, payment gateways, and KYC vendor flows.
What You Gain
The outcomes FinTech founders care about — delivered before you process real money.
Launch With Confidence
Process live money transfers knowing your ledger and APIs are hardened.
Pass Sponsor Bank Audits
Satisfy due-diligence questionnaires from banking partners and payment processors.
Prevent Double Spending
Eliminate race conditions and balance manipulation vulnerabilities.
Protect Customer Assets
Keep customer balances and bank credentials completely isolated and safe.
Halt Fraud In Flight
Block unauthorized wire transfers and account takeovers before settlement.
Scale Banking Volume
Grow transaction volume smoothly without security bottlenecks.
Questions FinTech Founders Ask
Everything you need to know about our pre-launch security audits, multi-tenant isolation, and penetration testing process.
Can you help us pass our sponsor bank's security questionnaire?
Yes, our audit reports and remediation certificates are tailored specifically for sponsor bank compliance reviews.
How do you test for transaction race conditions?
Do you review webhook security for payment processors like Stripe or Plaid?
Protect Your Product Before Launch
With Expert Security.
Our cybersecurity team will conduct a deep manual assessment of your architecture, uncover vulnerabilities, and give you actionable defense.