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Debugging a relay API in Claude Code / Codex: 401 vs 404 vs 429

A developer published a troubleshooting guide for pointing Claude Code and Codex at third-party relay APIs, mapping HTTP status codes to their causes: 401 indicates an authentication problem such as using ANTHROPIC_API_KEY instead of the Bearer ANTHROPIC_AUTH_TOKEN, 404 points to base_url path issues like appending /v1 to Anthropic-compatible endpoints that already expect /v1/messages, and 429 signals rate limiting. The guide recommends registering multiple relay stations so a single rate-limited provider never blocks work, and includes a dated list of tested relay stations.

read1 min views1 publishedOct 11, 2026

When you point Claude Code or Codex at a third-party relay and it errors, read the status code first — it tells you exactly what's wrong:

/v1 on base_url: Anthropic-compatible endpoints have /v1/messages); OpenAI-compatible endpoints ANTHROPIC_AUTH_TOKEN (Bearer), not ANTHROPIC_API_KEY. Keep a couple of stations registered so a single one rate-limiting never blocks you. List with tested dates: AI relay station list

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source & further reading
dev.to — original article Why Our CLI Deadlock Detector for Multi-Agent LLMs Timed Out: A Post-Mortem on Naive Jaccard Heuristics ElevenLabs vs Google Cloud TTS: Developer Comparison Inspect AI in Production: A Hard-Nosed Review of Agent Evals, Logs, and Model-Upgrade Gates
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