How to stop paying for Amazon software tools

Thursday 19th of March 2026

Summary: Kevin King breaks down how Amazon sellers can access their own data for free using the SP-API as a private developer, and how to build custom tools with vibe coding, Claude Code, or a hired developer. He also covers Amazon's new AI-powered Interests feature, a PPC case study from Sophie Society, Jason Fladlien on the Marketing Misfits, and a cash flow solution for scaling sellers called Liquid Inventory from eCapital.

Key Points Discussed:

• Amazon's SP-API pricing change and how to access your own seller data for free as a private developer
• Building custom seller tools using vibe coding, Claude Code, or freelance developers
• What you can build: profitability dashboards, PPC bid automation, account health monitoring, pricing automation, and inventory forecasting
• The "dumb person method": a PPC profit margin strategy from Sophie Society (Cardiology brand case study)
• Marketing Misfits: Jason Fladlien on the psychology of selling one-to-many and the $100M book launch
• Amazon's new AI-powered Interests feature and what it means for listing optimisation
• Liquid Inventory by eCapital: inventory-linked revolving credit for Amazon sellers doing $1M+
• Trustpilot as an AI winner: how review platforms are benefiting from AI shopping tools

Links Mentioned:

• Meet 100+ top-tier creators in Nashville, April 8-11
• Register as a private developer on Amazon
• Generate your Amazon Ads API credentials
• Sophie Society PPC case study: Cardiology brand
• Marketing Misfits: Jason Fladlien - The Webinar GOAT
• Marketing Misfits Newsletter
• Destaney Wishon on Amazon's new Interests feature
• Liquid Inventory by eCapital

Hot Picks:

• Amazon adds 1 and 3-hour delivery options in the US
• Amazon now delaying seller payments - or are they?
• Temu rapidly growing in Spain and Italy
• Amazon's move into big box retail could be a massive opportunity for sellers
• ChatGPT sources 83% of its carousel products from Google Shopping

Stump Bezos Answer: The global human influencer industry is worth $32 billion

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