
Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
#1API2D records 214 monthly visits with -91.3% month-over-month growth and Paid pricing. Flatkey records 49,134 monthly visits with -40.8% growth and Paid, Contact for Pricing pricing.

Use top AI models like electricity — register, top up, paste your key
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | api2d.com | flatkey.ai |
| Pricing Model | Paid | Paid, Contact for Pricing |
| Monthly Visits | 214 (214) | 49.13K (49,134) |
| MoM Traffic Delta |
| -2.23K (-91.3%) |
| -33.92K (-40.8%) |
| Primary Market & Share | 🇹🇼 Taiwan (100%) | 🇨🇳 China (69.9%) |
|---|
| Direct Visits / mo | 86 | 30.53K |
|---|
| User Rating | 3.8 | 4.1 |
|---|
| Supported Platforms | Website | Website |
|---|

Use top AI models like electricity — register, top up, paste your key
One base URL and key work with virtually any app, SDK or self-hosted chat client that supports a custom API address.
Route requests to OpenAI models, Claude, Stability diffusion, Azure TTS and vector database services from a single account.
Consumption is metered in points with a published multiplier, so you pay for what you use rather than a flat subscription.
Identical request bodies return cached answers for free for 24 hours, and a header can disable caching when freshness matters.

One API key for frontier models, 1,000+ AI tools, and one invoice
Point your existing SDK at Flatkey's router URL and select models by ID instead of managing a credential per provider.
Frontier chat models and 1,000+ pay-per-call tools share one auth layer, one balance, and one invoice.
Issue scoped keys per agent or environment, capped by spend and restricted to approved models and tools.
Requests route across five channel classes; when one degrades the router reroutes, backed by a 99.5% SLA document.

Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
#1Free / Open-sourceOne API key for hundreds of AI models from every major provider
Free / Open-sourceOne OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control

Free / Open-sourceOne OpenAI-compatible API key for 500+ AI models

Free / Open-sourceOne open-source AI gateway for 100+ LLM providers


Free / Open-sourceOne API for LLM, image, video, and audio models in production

One API key, 100+ LLMs, official pricing with no platform markup
One API key for hundreds of AI models

One OpenAI-compatible key for discounted GPT, Claude and Gemini access
Free / Open-sourceOne OpenAI-compatible API to route, monitor and control 250+ LLM models

Free / Open-sourceOne AI media API for image, video and LLM models

One key, one balance, and every major text, image, and video model behind a single OpenAI-compatible endpoint.
Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
Free / Open-sourceOne API key for hundreds of AI models from every major provider
Free / Open-sourceOne OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control
Free / Open-sourceOne OpenAI-compatible API key for 500+ AI models
Free / Open-sourceOne API for LLM, image, video, and audio models in production
Free / Open-sourceOne OpenAI-compatible API to route, monitor and control 250+ LLM models