Use multiple model providers through one API. Compatible chat models accept OpenAI or Anthropic requests. The public catalog lists each model ID, endpoint, and current customer price. Paid usage is deducted from prepaid USD credit. Compatible chat formats Compatible chat models can use either wire protocol:

OpenAI-compatible: POST https://keeprouter.com/v1/chat/completions with Authorization: Bearer sk-kr-…

Anthropic-compatible: POST https://keeprouter.com/v1/messages with x-api-key + anthropic-version, the same endpoint Claude Code and the Anthropic SDK use

The same key authenticates both chat formats. On compatible chat routes the gateway can translate supported tool calls and streaming events. Specialized models use the route-specific endpoint shown in the live catalog.Product facts

Access to models from multiple makers in the current catalog.

Pay-as-you-go prepaid credits in USD; you pay for measured token usage or the published per-image charge, with no monthly fee or subscription.

New accounts receive free trial credit; top up by credit or debit card (processed by Paddle as Merchant of Record).

Text models are billed per token (input / output / cached); image models are billed per image.

Make the first request

Create an API key (prefixed sk-kr-).

Use the endpoint listed for the selected model's modality and active route.

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