Anthropic Auth · Billing · ToS

Credential Tracer

Pick a scenario. Watch the auth flow resolve. See which billing pool gets debited and which paths violate the Terms of Service.

universes claude.ai · console

credentials oat01 · api03

as of May 2026

Select a scenario

02 Setup & trace

03 Verdict

OK — sanctioned path

INFO — trace step

WARN — works, but bills unexpectedly

FAIL — refused or out of scope

Reading the prefix: sk-ant-oat01-… is an OAuth token from a claude.ai subscription, scoped to first-party tools. sk-ant-api03-… is a Console API key, scoped to per-token billing. They never cross-fund.
Precedence order in Claude Code: cloud creds (Bedrock/Vertex) → ANTHROPIC_AUTH_TOKEN → ANTHROPIC_API_KEY → subscription OAuth. The first match wins, silently. Run /status to see which.