Every week, Lucas and Luna sit down at a developer-focused office workstation to trace how applications actually talk to each other — not the hype, but the design decisions, trade-offs, and real-world failures that shape modern API architecture. Lucas, with a journalist's precision, lays out why a team chose REST over GraphQL for a payments pipeline handling 50,000 requests per second, or how a poorly designed endpoint caused a cascade failure in a major ride-hailing service. Luna, the engaged interlocutor, pushes back: when does schema flexibility become a liability? How do versioning strategies survive a decade of production use? Together, they dissect public postmortems, API design docs, and developer surveys — not to sell a tool, but to understand the engineering logic behind each choice. This show is for backend engineers, API product managers, and technical leads who need to decide, not just follow the trend. Expect no demos, no code walkthroughs — just two smart people reasoning
Pitch Analysis
Required Pod Score for this show. PitchCentric checks your profile against host openness, topical fit, and audience signals before you generate a pitch.
Contact path
Verified email
Booking probability
35%
Guest openness
Selective
Verified email on file
80/100
Required Score
Sign up to generate a grounded pitch for The API Podcast with Fexingo: REST, GraphQL, and Modern Web APIs.
What is The API Podcast with Fexingo: REST, GraphQL, and Modern Web APIs?
The API Podcast with Fexingo: REST, GraphQL, and Modern Web APIs is a business podcast hosted by Fexingo, with 176 episodes on record and a Required Pod Score of 80. PitchCentric scores this show on Booking Probability, Listen Score, and live audience signals refreshed every 24 hours.
About the host
Fexingo hosts The API Podcast with Fexingo: REST, GraphQL, and Modern Web APIs, a business show with 176 episodes published.
Our AI reads these to draft pitches. Use them as grounding for a pitch that cites a real guest and a specific topic.
Episode #185
How API Idempotency Keys Prevent Double Charges
Sep 13, 202613 minS4
Most payment failures aren't technical bugs but user behavior. When a customer clicks 'Pay' twice due to slow loading, the system processes two transactions unless idempotency keys are enforced. This episode explores how Stripe and other modern payment processors use unique request identifiers to ensure that duplicate requests result in only one charge. We break down the implementation details of header-based deduplication, why it is critical for financial integrity, and how developers can add this layer of safety without significant overhead. If you build APIs handling money or state changes, understanding this pattern is not optional. #APIIdempotency #PaymentProcessing #StripeAPI #WebDevelopment #TechEngineering #FexingoBusiness #BusinessPodcast #SoftwareArchitecture #DeveloperTools #RESTAPIs #DigitalPayments #CodeQuality #SystemDesign #TechNews #StartupTech #CloudComputing #BackendDevelopment #ConsumerTech Keep every episode free: buymeacoffee.com/fexingo
We examine how the shift from synchronous REST calls to asynchronous event streaming exposes a critical flaw in modern architecture: the inability of downstream services to signal they are overwhelmed. Using the concept of backpressure, we explore why simply queuing requests is not enough and how protocols like gRPC and Kafka Streams allow systems to push back against demand before crashing. We also look at the specific failure modes that occur when APIs ignore consumer capacity, leading to cascading outages. #APIArchitecture #Backpressure #AsynchronousSystems #EventStreaming #SystemResilience #Microservices #GPRC #KafkaStreams #DistributedSystems #LatencyOptimization #CapacityPlanning #DataEngineering #TechLeadership #SoftwareDesign #FexingoBusiness #BusinessPodcast #TechnologyTrends #Infrastructure Keep every episode free: buymeacoffee.com/fexingo
We drill into the hidden economics of API rate limiting, using Stripe's sliding window algorithm as our anchor. In a market where compute costs are rising, how do companies balance protecting their infrastructure with preventing customer frustration? We break down why fixed windows fail, how token buckets work in practice, and what happens when you hit that forty-two percent throttle threshold on a busy Tuesday morning. #APIDesign #RateLimiting #StripeAPI #SlidingWindow #TokenBucket #TechInfrastructure #CloudComputing #SoftwareEngineering #DevOps #SystemArchitecture #FexingoBusiness #BusinessPodcast #TechnologyNews #WebDevelopment #APIEconomics #Scalability #LatencyOptimization #LucasAndLuna Keep every episode free: buymeacoffee.com/fexingo
Every time a customer clicks buy now twice by accident, your payment processor charges you twice. That is not just a bug; it is a direct leak in your unit economics. In this episode, we look at how idempotency keys transform chaotic user behavior into deterministic system outcomes. We use Stripe's implementation as the primary case study because they treat idempotency not as an afterthought but as a core contract with developers. You will learn why storing the request body matters for debugging, how to handle cache invalidation without race conditions, and why ignoring this pattern costs real money during high-traffic events like Black Friday or product launches. If you run any service that accepts writes, this is the architecture decision that separates robust systems from fragile ones. #APIIdempotency #WebDevelopment #StripePayments #SystemDesign #BackendEngineering #TechInfrastructure #DeveloperExperience #RESTAPIs #GraphQL #SoftwareArchitecture #FexingoBusiness #BusinessPodcast #TechnologyTrends #CodingBestPractices #DigitalTransformation #CloudComputing #EnterpriseSoftware #StartupGrowth Keep every episode free: buymeacoffee.com/fexingo
When a critical service spikes in traffic, does your system gracefully degrade or flatline? This episode explores the often-overlooked mechanism of backpressure in modern web APIs. We examine how companies like GitHub and Stripe implement flow control to protect downstream dependencies during traffic surges. Lucas breaks down the difference between passive rate limiting and active backpressure signals, while Luna shares an anecdote about a recent outage caused by ignoring upstream warnings. Learn why sending a fifty-three-two status code can be more valuable than any caching strategy for maintaining long-term reliability. #APIDesign #Backpressure #SystemReliability #TechInfrastructure #WebAPIs #DeveloperTools #SoftwareEngineering #FexingoBusiness #BusinessPodcast #TechTrends2026 #CloudComputing #Microservices #APIGateway #LoadBalancing #DevOps #SRE #DigitalTransformation #LucasAndLuna Keep every episode free: buymeacoffee.com/fexingo
Every question we get asked before someone starts their trial.
If you have a concern about deliverability, AI quality, data privacy, or whether this will actually work for your specific situation, it's probably answered below.
What is the difference between Founder Solo and Founder Pro?
Founder Solo gives you 50 AI pitches per month using the credit model (Standard pitches cost 1 credit, Enriched pitches cost 2). Founder Pro raises that to 200 credits per month and adds full Booking Probability access, unlimited Magic Match, Apollo enrichment credits, and data export capabilities. Both plans use the same credit system, so you can stretch your monthly budget further by using Standard-mode drafting.
How do agency tiers work?
Agency tiers have no base fee. You pay per managed client and per talent profile. Agency Standard is $199 per client per month; Agency Pro is $399 per client per month. Both add $39 per talent profile per month. Your own team's user seats are always free.
What is a talent profile?
A talent profile represents one person (founder, executive, or spokesperson) you are booking onto podcasts. It includes their bio, topics, headshots, and outreach history. Team plans include 5 profiles; agency plans are pay-as-you-go.
Can I switch plans later?
Yes, at any time. Upgrades take effect immediately; downgrades apply at the end of the current billing period. Contact support if you need help migrating between plan families.
Do you offer a free trial?
Every paid plan includes a 15-day free trial. Your card is saved at signup but you will not be charged until day 16. Cancel any time from your dashboard.
What happens if I cancel?
You keep access until the end of your current billing period. No charges after that. Your data is retained for 30 days in case you reactivate.
Is the 20% annual discount automatic?
Yes. Select Annual on the pricing toggle and the discounted price is applied automatically at checkout. The annual price shown is the full year cost.
What if I have more than 50 profiles or 20 clients?
That is our Enterprise tier. Contact our sales team and we will build a custom plan with volume pricing, a dedicated account manager, and SLA guarantees.
