Impossibl is an OpenAI-compatible AI gateway. Machine-readable docs for agents: /llms.txt. Agent onboarding: /auth.md. OpenAPI spec: https://api.impossibl.com/openapi.yaml. API base URL: https://api.impossibl.com/v1. Quickstart: POST https://api.impossibl.com/v1/accounts with {} to receive an api_key, then call https://api.impossibl.com/v1/chat/completions with a Bearer token. Model list and live pricing: https://api.impossibl.com/v1/models.