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Flatkey (listed on directories as Flatkey AI)
One API key and one balance for 100+ AI models and 1,000+ pay-per-call tools, with an OpenAI-compatible endpoint you can drop into existing code.
5/5
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Overview
Flatkey is an AI infrastructure platform that gives developers over 100 official AI models and over 1,000 pay-per-call tools behind one API key, one balance, and one invoice. It works as a drop-in replacement for any OpenAI-compatible client: you change the base URL and your existing code keeps working. It's aimed at developers, AI product teams, and agent builders who juggle several providers, and it can be pointed at coding tools like Claude Code and Codex. The company is based in San Jose, launched in July 2026, and announced a $10M Series A, shared with sister company Realset AI, after passing 10,000 developers in two months. Those figures come from the company's own press release.
Video Walkthrough
Lab Test Results
Flatkey is a convenient gateway for developers who use several AI providers. Its appeal is simplicity: one key, one balance, and a single base URL change instead of separate accounts and invoices. It's a young company, though, and the usual gateway questions apply.
Key Features
Feature 1: Unified access. One API key and one balance cover many models. The model count varies by source: 100+ in the company's press release, 200+ in directory listings.