nexus-claude-api

Local Anthropic-compatible API proxy for using AI Nexus Claude models with Claude Code.

AI Nexus currently documents AWS Bedrock Converse API as the workaround while Anthropic Messages API support is unavailable. This service exposes local Anthropic-compatible endpoints and translates them to Nexus Converse requests.

Quick Start

cd nexus-claude-api
uv sync --extra dev
uv run nexus-claude-api start --port 4141 --claude-code

Use the printed Claude Code command in the same shell.

ANTHROPIC_AUTH_TOKEN='dummy' in the printed command is only a local Claude Code compatibility placeholder. Claude Code expects an Anthropic auth token variable to exist, but this local proxy does not validate it by default. It is not your Nexus key.

Endpoints

• GET /
• GET /health
• GET /v1/models
• POST /v1/messages
• POST /v1/messages/count_tokens

Environment

Credential lookup order:

1. --api-key
2. local nexus-claude-api.local.json
3. NEXUS_API_KEY
4. AWS_BEARER_TOKEN_BEDROCK

For local hardcoded configuration, create nexus-claude-api.local.json:

{
  "api_key": "your-nexus-api-key"
}

This file is ignored by git.

The service binds to 127.0.0.1 by default and does not persist API keys.

Docs

• PRD
• Requirements Design
• AI Nexus Claude Documentation