What's causing the sudden increase in failed transactions on Luno's crypto-to-fiat exchange feature?

Introduction

The sudden increase in failed transactions on Luno's crypto-to-fiat exchange feature is a critical issue that demands immediate attention. This analysis will systematically identify, validate, and address the root cause while considering both short-term fixes and long-term implications for the platform's stability and user trust.

I'll approach this problem by first clarifying the context, then ruling out external factors before diving deep into the product's user journey, metric breakdown, and data analysis. From there, I'll form and validate hypotheses, conduct root cause analysis, and propose a comprehensive resolution plan.

Step 1

Clarifying Questions (3 minutes)

• Looking at the transaction flow, I'm thinking there might be a bottleneck in the system. Has there been a significant increase in transaction volume recently?

Why it matters: A sudden spike in volume could overwhelm the system, leading to failures. Expected answer: Yes, we've seen a 30% increase in transaction attempts. Impact on approach: If confirmed, we'd focus on scalability issues.

• Considering the crypto market's volatility, I'm wondering if there's been a recent price fluctuation. Have we seen any unusual price movements in the past week?

Why it matters: Extreme price volatility could trigger a flood of transactions, potentially overloading the system. Expected answer: Bitcoin dropped 15% in 24 hours three days ago. Impact on approach: If true, we'd investigate how our system handles high-stress market conditions.

• Thinking about system dependencies, I'm curious about our third-party integrations. Have there been any reported issues with our payment processors or banking partners?

Why it matters: External dependencies could be causing the failures if they're experiencing downtime or errors. Expected answer: No reported issues from our partners. Impact on approach: If confirmed, we'd shift focus to internal systems and processes.

• Considering recent updates, I'm wondering about any changes to our transaction processing logic. Have we deployed any updates to the exchange feature in the last two weeks?

Why it matters: Recent changes could have introduced bugs or unintended consequences. Expected answer: A minor update was pushed last week to optimize transaction speed. Impact on approach: If true, we'd prioritize reviewing and potentially rolling back recent changes.