Billion Dollar Sellers

How to stop paying for Amazon software tools

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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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        Billion Dollar SellersBy Kevin King