AI API relay station providing access to multiple AI models with unified billing
Scalable self-hosted real-time messaging and state sync platform
Stage
Startup
Established
Founded
2026
2023
Based in
Not given
CY
Pricing model
Paid
Open source
Pricing
Pay-as-you-go with Alipay top-ups. Minimum charge ¥10, exchange rate ¥1 = $1 credit. Pricing varies by model and group: GPT models from $0.02 input / $0.12 output per million tokens in the 0.1x group; Claude models from $0.50 input / $3.00 output per million tokens in the 0.4x group; Grok models ava
Open source version is free. Centrifugo PRO available with flat licensing (no per-connection or per-message fees) and requires contacting sales for a quote.
Key features
Group-based API key management with separate billing multipliers from 0.1x to 0.7x
Unified balance across multiple AI model providers
OpenAI-compatible endpoint requiring only Base URL change
Support for Claude Messages interface for Claude models
Anytime balance withdrawal with no fees
Base64 image input support
WebSocket, HTTP-streaming, SSE, WebTransport, and gRPC transports
Channel history and message recovery
Flexible authentication and authorization
State synchronization with transactional consistency
Connection event proxying to backend
Online presence detection for users
Efficient binary Protobuf protocol
Resumable streams and transport fallback for AI applications
What makes it different
Lowest pricing multipliers in the market at 0.1x baseline
Unified billing across different model providers with single balance
No withdrawal fees for unused balance
Simple integration with only Base URL change needed
Set up once and works forever with no ongoing configuration needed
Handles millions of concurrent connections with minimal hardware
Self-hosted so messages and data never leave your infrastructure
No per-connection or per-message billing
Works in production at scale with proven reliability
GPTZZZ
Centrifugo