AI APIs look alike. Their contracts differ.

Monoize is a Rust gateway for OpenAI Responses, Chat Completions, Anthropic Messages, Gemini, embeddings, and image APIs. It converts protocol semantics, routes one logical model across multiple upstream channels, and recovers from upstream failures.

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Protocol conversion

Monoize decodes each protocol into a typed canonical form and encodes it for the upstream. Text, reasoning, tool calls, images, and usage keep their roles.

Request capture

Enable capture per request source. Inspect exact downstream and upstream payloads in a structured viewer.

Transforms

33 built-in transforms adjust requests and responses per Provider, per API key, or globally. Model globs select where each rule applies.

Routing and reliability

Monoize retries failed channels and moves forward to the next route. Fallback stops after the first response byte.