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Hacking APIs Conference London

Where APIs break, and real security gets built.

23 September 2025 • Convene 155 Bishopsgate, London

London is the global capital for fintech and open banking, and one of the hottest targets for attackers. HAC London brings hackers, defenders, and security teams together for live exploits, hands-on labs, and real-world tactics to protect the APIs powering finance, SaaS, and government services.

Attend

Speak

Sponsor

500+

participants

300+

companies

20+

speakers

20+

sessions

Teams stepping into the arena

Join the hackers and security pros who brought their skills, and left sharper.

Turn hacks into lessons, and lessons into stronger APIs

Hack live

Watch APIs break in real time, and learn how to fix them before attackers do.

Hands-on labs

Stop listening, start doing. Test real tools and defenses on real systems.

Unfiltered war stories

Hear how breaches happened and what actually stopped them—straight from the people who lived it.

Practical, not theoretical

Get tactics and frameworks you can use immediately.

Community that builds and breaks

Join hackers, defenders, and engineers who care about one thing: making APIs stronger

What past HAC builders and breakers say

The sessions provided valuable insights into how APIs are driving innovation and supporting digital transformation across industries. It was also a great to connect with others working in this space and exchange ideas. Looking forward to applying some of these learnings in my work.

Romain Olivier

Software Engineer at Ciril GROUP

Two days packed with great conversations and presentations, including the OpenAPI Initiative's OAI Track. Congrats to the team for getting to record attendance, and see you all next year!

Erik Wilde

Principal Consultant at INNOQ

Brilliant to collaborate with our API expert and leadership peers at apidays, exchanging meaningful insights on how we can deliver better experiences for our global clients and colleagues.

‍

Chris Jones

Product Owner & Lead at Swiss RE

Here’s how you can join the action

Attend

Secure your spot and be part of the proving ground for API security.

Get your ticket

Speak

Got a war story, zero-day research, or a defense strategy that worked when everything was on fire? This is your stage.

Apply to speak

Sponsor

Support the event that’s bringing real API security into the spotlight, and get in front of the people who live it every day.

Sponsorship info