{"per_key_rate_limit":null,"per_ip_rate_limit":null,"per_account_balance_gate":true,"concurrent_requests_per_key":"unbounded (pool-limited)","account_pool_size":35,"max_upstream_retries":8,"max_tokens_enforced":true,"notes":["Upstream (claude.ai) has its own soft limits; we surface any 429 as 502 upstream_error after retries.","Balance depletion returns 402 insufficient_balance.","Long streams held past 600s are dropped by nginx (proxy_read_timeout)."]}