Claude Code setup

Configure Claude Code to call the Anthropic-compatible 0-0 endpoint.

Scope

Claude Code

This setup writes Claude Code configuration under ~/.claude. The API key stays in a local helper script, while settings.json points Claude Code to the configured gateway.

Base URL

Claude Code uses ANTHROPIC_BASE_URL without /v1. This page derives it from PUBLIC_API_BASE_URL by removing a trailing /v1 when present.

1) Overwrite ~/.claude/settings.json

Run the command below to overwrite ~/.claude/settings.json:

bash

1mkdir -p ~/.claude2cat > ~/.claude/settings.json <<'JSON'3{4  "apiKeyHelper": "~/.claude/anthropic_key.sh",5  "env": {6    "DISABLE_TELEMETRY": "1",7    "OTEL_METRICS_EXPORTER": "otlp",8    "ANTHROPIC_BASE_URL": "https://api.0-0.pro",9    "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "1",10    "CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS": "1"11  },12  "includeCoAuthoredBy": false13}14JSON

2) Update ~/.claude/anthropic_key.sh

Replace sk-xxx with your own 0-0 key, then write the helper script:

bash

1mkdir -p ~/.claude2cat > ~/.claude/anthropic_key.sh <<'SH'3#!/bin/sh4echo "sk-xxx"5SH6chmod 700 ~/.claude/anthropic_key.sh

3) Restart Claude Code

Restart Claude Code after both files are saved. Send a test prompt, then open Logs to confirm the request is recorded.

Troubleshooting

If requests still go to the official endpoint, confirm Claude Code is reading ~/.claude/settings.json and restart it again.
If authentication fails, make sure ~/.claude/anthropic_key.sh prints only the API key.