impossibl
impossibl provides a unified OpenAI-compatible API that routes requests to models from OpenAI, Anthropic, Google, xAI, and other providers through a single key and billing system. The platform supports bring-your-own-key integrations so existing provider credits and negotiated rates continue working, while usage is charged at list price with no markup. Automatic fallbacks between providers ensure applications stay operational when a provider degrades.
- Artificial Intelligence
- AI Agents
- Developer Tools
- Software Only
Funding
Founders
Product
Problem
Developers building AI-powered applications face fragmentation across multiple model providers, each requiring separate API keys, authentication protocols, billing systems, and usage tracking. Managing multiple integrations increases engineering overhead, complicates cost monitoring, and creates single points of failure when an individual provider experiences downtime or degrades service.
Solution
impossibl offers a single OpenAI-compatible API endpoint that unifies access to models from OpenAI, Anthropic, Google, xAI, and other AI creators through one API key and one billing balance. Developers select a model by its full catalog ID and send standard requests to a shared base URL, eliminating per-provider integration work. The platform automatically routes requests intelligently, provides automatic fallbacks when providers degrade, and unifies usage metrics like tokens-per-second across all supported services. Users can bring existing provider keys through the BYOK feature, allowing matching requests to bypass credit balances and bill directly at their contracted rates. Usage is charged at provider list price with zero markup, and prepaid credit purchases carry a 5% platform fee with no subscription required. The service supports text, chat, vision, image generation, audio transcription and generation, embeddings, reranking, tool calling, and evaluation workloads from one integrated endpoint.
Target Audience
Primary users are software developers and AI engineering teams building production applications who want to integrate multiple language model providers through a single API key and billing system, including organizations with existing provider contracts or credits.
Features
- Unified OpenAI-compatible API (https://api.impossibl.com/v1) supporting chat, vision, audio, image generation, embeddings, reranking, and evaluation tasks from one key
- Automatic fallback routing that switches providers when one degrades or fails, ensuring continuous application uptime
- Bring-your-own-key (BYOK) support for OpenAI, Anthropic, Google, xAI, Bedrock, and Azure credentials, preserving existing credits and negotiated enterprise rates
- Unified usage dashboard with per-request cost display, tokens-per-second metrics, and a single prepaid balance spanning all providers
- Full model catalog with IDs like openai/gpt-4o-mini for explicit model selection and consistent multi-provider naming conventions
- Zero percent usage markup with a 5% platform fee on credit purchases only, with no subscription fees or per-seat costs
- Streaming responses, tool calling, vision understanding, audio transcription/understanding, text-to-speech, and image generation all accessible through one SDK-compatible interface