Flatkey Raises $10M Series A After Surpassing 10,000 Developers in Two Months

The platform replaces a growing stack of provider accounts, credits and keys with one key, one balance and one invoice, at 60–90% of official list prices

SAN JOSE, Calif., Sept. 24, 2026 /PRNewswire/ -- Flatkey (https://flatkey.ai), the AI infrastructure platform that brings models, tools and data together behind one API key, today announced that Flatkey and Realset AI have raised $10 million in Series A funding. The company also said that more than 10,000 developers have adopted the platform in the two months since its July 2026 launch, using a single API key and a single balance to access more than 100 official AI models and more than 1,000 AI tools. The Series A funding will go toward adding more official models and tools to the platform and scaling the infrastructure that routes developer traffic to them.

Flatkey is built as production infrastructure for AI developers, not a convenience layer. Every call is routed to the provider's official endpoint, and because Flatkey buys upstream capacity in volume, most models are priced at around 80% of the providers' official list prices, with some at 60% or lower as part of ongoing promotions. Developers pay less than they would going direct, and they do it through one key and one balance across models and tools.

Why It Matters: Models, Tools and Data Are Becoming One Layer

AI is shifting from answering questions to completing work. The agents doing that work depend on three things: the models that reason, the tools that act, and the data they act on. Each of those is fragmenting into more providers every quarter, and every provider adds an account, a top-up, an API key, a rate limit and an invoice.

Flatkey's bet is that these three converge into a single layer developers reach through one key. A production application today rarely depends on one model: it combines several models across text, image, audio and video and pairs them with tools such as search, browsing and data enrichment. A team using models from OpenAI, Anthropic, Google and DeepSeek, a video model such as Seedance, and a search and a browser tool would ordinarily manage seven or more provider relationships. With Flatkey that becomes one key, one balance and one invoice, and a new model or tool is a parameter change rather than a new vendor.

What Developers Get

• More than 100 official models from OpenAI, Anthropic, Google, DeepSeek, Kimi, GLM and others, plus image and video models such as Seedance. Every call is routed to the provider's official endpoint. Flatkey does not self-host modified or quantized versions and label them as the original model.
• More than 1,000 tools on the same balance: search, browsers, data enrichment, media generation and actions, with no separate billing setup per vendor.
• Simple pricing. Subscription plans start at $10 per month, and pay-as-you-go credits cover both models and tools on one balance.
• A one-line migration. Flatkey is a drop-in replacement for any OpenAI-compatible client: developers change the base URL and their existing code works.
• New models on release day. Flatkey adds new models through official channels as soon as they are released, so teams do not open a new provider account every time something new ships.

"AI development is becoming less about choosing one model and more about combining models, data and tools across text, image, audio and video," said Hunter Guo, founder of Flatkey. "If developers can reach all of that through one key, the platform stops being a convenience layer and starts to look like infrastructure. That is the company we are building."

Availability

Flatkey is available today at https://flatkey.ai. New users start with $1 in free credit and can continue with pay-as-you-go credits or a monthly plan.

About Flatkey

Flatkey is an AI infrastructure platform that gives developers access to more than 100 official AI models and more than 1,000 AI tools through one key and one balance. Headquartered in San Jose, California, Flatkey launched in July 2026. Learn more at https://flatkey.ai 

Media Contact

Xingru Ren
Head of Marketing, Flatkey
+1 424 356 6176
xingru@flatkey.ai
https://flatkey.ai 

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Flatkey Raises $10M Series A After Surpassing 10,000 Developers in Two Months

SHENZHEN, China, Sept. 23, 2026 /PRNewswire/ -- TENNIIX, an official sponsor of the 2026 Billie Jean King Cup Finals, unveiled TENNIIX ULTRA MAX, an embodied AI tennis robot jointly developed by Shenzhen Enhanced Power Technology Co., Ltd. and LimX Dynamics. The demonstration brought together advanced tennis intelligence and robotic mobility to explore a new model of sports training.

Billie Jean King Cup Event Recap Video

On court with Chinese tennis player Wang Qiang, ULTRA MAX delivered challenging topspin shots and high, deep looping balls, varying placement to move her around the court. The demanding exchanges highlighted the system's ball quality and ability to create sustained pressure, giving even a professional player a challenging workout.

ULTRA MAX integrates the TENNIIX PRO AI tennis training system with LimX Dynamics' TRON 2 mobility platform. TENNIIX provides perception and decision-making capabilities that operate without external sensing equipment. Its system tracks ball trajectories, spin and landing points, detects player positioning and movement, and receives training instructions through intelligent voice interaction. Adaptive AI adjusts subsequent deliveries based on the quality of players' returns, generating varied patterns including fast serves, short balls, heavy topspin and slices.

LimX Dynamics contributes a wheeled-leg robotic platform supporting multidirectional movement, turning, rapid stops and stable positioning. Its adjustable structure enables delivery heights from 1.2 to 1.6 meters, combining movement and height variation for more dynamic practice.

Together, these technologies point toward a shift from preset ball-feeding drills to responsive training that challenges players' movement, shot selection and consistency.

TENNIIX's broader ambition is to make the benefits of AI tangible in everyday sport. By addressing difficulties such as finding an available, suitably matched practice partner, the company aims to give more players access to engaging, adaptable training. Future deployment of ULTRA MAX across tennis clubs and facilities is intended to complement coaching, expand practice opportunities and improve the on-court experience.

Both companies are based in Shenzhen, drawing on the city's robotics and engineering ecosystem. ULTRA MAX is also planned for exhibition during the Asia-Pacific Economic Cooperation (APEC) meetings, showcasing how embodied AI can move from technology demonstrations into practical sports applications.

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TENNIIX Unveils Embodied AI Tennis Robot at Billie Jean King Cup Finals, Advancing a New Era of Tennis Training