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Welcome to Kotoba Cloud

One API. Verified researchers. OpenAI-compatible — tool calls and streaming included.

Kotoba Cloud is an OpenAI-compatible inference API. Point an existing OpenAI SDK at https://api.kotoba.cloud/v1 and call security-research-tuned models behind guardrails, a firewall and audit receipts. The verified free allowance stays; add prepaid credits only as you need them.

Why Kotoba Cloud

  • OpenAI-compatible by design

    Every request and response is in the OpenAI JSON shape. Change one line (base_url) and streaming, tool calling and reasoning keep working. Anthropic-protocol tools drop the /v1 from the base URL.

  • Admission for researchers

    Red-team models run only behind card-based identity verification, AUP consent and an approved scope; blue-team models need a sign-in. Guardrails run on every request either way.

  • Prepaid, no markup on the meter

    1 credit = $1. Input $0.9/M and output $4.5/M tokens, settled from the provider receipt. No automatic top-up; with no balance you are simply on the free allowance.

  • Zero data retention

    Prompts and outputs are processed in memory; no inference logs. What remains is verification status, evidence references and audit receipts.

Where to start

  • Quickstart

    Make your first call in five minutes.

  • Compatibility

    Point Claude Code, Codex CLI, Cursor, Cline, Aider, hermes and any OpenAI / Anthropic SDK at Kotoba Cloud.

  • Advanced

    Streaming, tool calling, structured outputs, reasoning.

  • API reference

    Every endpoint, error, limit and charge.

  • Graph & ontology database

    Kotobase: content-addressed graph state and Datalog.