Financial API Security: How to Protect Each Type of API
Blog post from Azion
Financial API security should be tailored to the distinct risks of authentication, transaction, data, and partner endpoints rather than applying uniform protections. Authentication APIs require behavioral analysis to identify distributed credential-stuffing attacks that evade conventional rate limits, while transaction APIs need Layer 7 inspection and endpoint-specific limits to detect valid-looking requests that abuse payment logic, parameters, or concurrency. Data APIs are vulnerable to large-scale scraping detectable through aggregate session, fingerprint, and request-pattern analysis, and partner APIs require mutual TLS to authenticate both clients and servers before requests reach application systems. Unified observability across WAF, bot detection, rate limiting, mTLS, DDoS protections, and event streaming to SIEM platforms can improve real-time investigations, incident response, and regulatory audit trails. Azion presents its integrated platform and deployments at FourBank, Crefisa, and Todo Cartões as examples of this endpoint-specific security architecture.
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